1 /*
   2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * This file is available under and governed by the GNU General Public
  28  * License version 2 only, as published by the Free Software Foundation.
  29  * However, the following notice accompanied the original version of this
  30  * file:
  31  *
  32  * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
  33  *
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright notice,
  40  *    this list of conditions and the following disclaimer.
  41  *
  42  *  * Redistributions in binary form must reproduce the above copyright notice,
  43  *    this list of conditions and the following disclaimer in the documentation
  44  *    and/or other materials provided with the distribution.
  45  *
  46  *  * Neither the name of JSR-310 nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  54  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  55  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  56  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  57  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  58  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  59  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  60  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  */
  62 package java.time;
  63 
  64 import static java.time.LocalTime.HOURS_PER_DAY;
  65 import static java.time.LocalTime.MICROS_PER_DAY;
  66 import static java.time.LocalTime.MILLIS_PER_DAY;
  67 import static java.time.LocalTime.MINUTES_PER_DAY;
  68 import static java.time.LocalTime.NANOS_PER_DAY;
  69 import static java.time.LocalTime.NANOS_PER_HOUR;
  70 import static java.time.LocalTime.NANOS_PER_MINUTE;
  71 import static java.time.LocalTime.NANOS_PER_SECOND;
  72 import static java.time.LocalTime.SECONDS_PER_DAY;

  73 
  74 import java.io.DataInput;
  75 import java.io.DataOutput;
  76 import java.io.IOException;
  77 import java.io.InvalidObjectException;
  78 import java.io.ObjectStreamException;
  79 import java.io.Serializable;


  80 import java.time.format.DateTimeFormatter;
  81 import java.time.format.DateTimeFormatters;
  82 import java.time.format.DateTimeParseException;
  83 import java.time.temporal.ChronoField;
  84 import java.time.temporal.ChronoLocalDateTime;
  85 import java.time.temporal.ChronoUnit;
  86 import java.time.temporal.ISOChrono;
  87 import java.time.temporal.OffsetDateTime;
  88 import java.time.temporal.Temporal;
  89 import java.time.temporal.TemporalAccessor;
  90 import java.time.temporal.TemporalAdder;
  91 import java.time.temporal.TemporalAdjuster;

  92 import java.time.temporal.TemporalField;
  93 import java.time.temporal.TemporalQuery;
  94 import java.time.temporal.TemporalSubtractor;
  95 import java.time.temporal.TemporalUnit;
  96 import java.time.temporal.ValueRange;
  97 import java.time.zone.ZoneRules;
  98 import java.util.Objects;
  99 
 100 /**
 101  * A date-time without a time-zone in the ISO-8601 calendar system,
 102  * such as {@code 2007-12-03T10:15:30}.
 103  * <p>
 104  * {@code LocalDateTime} is an immutable date-time object that represents a date-time,
 105  * often viewed as year-month-day-hour-minute-second. Other date and time fields,
 106  * such as day-of-year, day-of-week and week-of-year, can also be accessed.
 107  * Time is represented to nanosecond precision.
 108  * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
 109  * stored in a {@code LocalDateTime}.
 110  * <p>
 111  * This class does not store or represent a time-zone.
 112  * Instead, it is a description of the date, as used for birthdays, combined with
 113  * the local time as seen on a wall clock.
 114  * It cannot represent an instant on the time-line without additional information
 115  * such as an offset or time-zone.
 116  * <p>
 117  * The ISO-8601 calendar system is the modern civil calendar system used today
 118  * in most of the world. It is equivalent to the proleptic Gregorian calendar
 119  * system, in which today's rules for leap years are applied for all time.
 120  * For most applications written today, the ISO-8601 rules are entirely suitable.
 121  * However, any application that makes use of historical dates, and requires them
 122  * to be accurate will find the ISO-8601 approach unsuitable.
 123  *
 124  * <h3>Specification for implementors</h3>
 125  * This class is immutable and thread-safe.
 126  *
 127  * @since 1.8
 128  */
 129 public final class LocalDateTime
 130         implements Temporal, TemporalAdjuster, ChronoLocalDateTime<ISOChrono>, Serializable {
 131 
 132     /**
 133      * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
 134      * This is the local date-time of midnight at the start of the minimum date.
 135      * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
 136      * This could be used by an application as a "far past" date-time.
 137      */
 138     public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
 139     /**
 140      * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
 141      * This is the local date-time just before midnight at the end of the maximum date.
 142      * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
 143      * This could be used by an application as a "far future" date-time.
 144      */
 145     public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);
 146 
 147     /**
 148      * Serialization version.
 149      */
 150     private static final long serialVersionUID = 6207766400415563566L;
 151 
 152     /**
 153      * The date part.
 154      */
 155     private final LocalDate date;
 156     /**
 157      * The time part.
 158      */
 159     private final LocalTime time;
 160 
 161     //-----------------------------------------------------------------------
 162     /**
 163      * Obtains the current date-time from the system clock in the default time-zone.
 164      * <p>
 165      * This will query the {@link Clock#systemDefaultZone() system clock} in the default
 166      * time-zone to obtain the current date-time.
 167      * <p>
 168      * Using this method will prevent the ability to use an alternate clock for testing
 169      * because the clock is hard-coded.
 170      *
 171      * @return the current date-time using the system clock and default time-zone, not null
 172      */
 173     public static LocalDateTime now() {
 174         return now(Clock.systemDefaultZone());
 175     }
 176 
 177     /**
 178      * Obtains the current date-time from the system clock in the specified time-zone.
 179      * <p>
 180      * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
 181      * Specifying the time-zone avoids dependence on the default time-zone.
 182      * <p>
 183      * Using this method will prevent the ability to use an alternate clock for testing
 184      * because the clock is hard-coded.
 185      *
 186      * @param zone  the zone ID to use, not null
 187      * @return the current date-time using the system clock, not null
 188      */
 189     public static LocalDateTime now(ZoneId zone) {
 190         return now(Clock.system(zone));
 191     }
 192 
 193     /**
 194      * Obtains the current date-time from the specified clock.
 195      * <p>
 196      * This will query the specified clock to obtain the current date-time.
 197      * Using this method allows the use of an alternate clock for testing.
 198      * The alternate clock may be introduced using {@link Clock dependency injection}.
 199      *
 200      * @param clock  the clock to use, not null
 201      * @return the current date-time, not null
 202      */
 203     public static LocalDateTime now(Clock clock) {
 204         Objects.requireNonNull(clock, "clock");
 205         final Instant now = clock.instant();  // called once
 206         ZoneOffset offset = clock.getZone().getRules().getOffset(now);
 207         return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset);
 208     }
 209 
 210     //-----------------------------------------------------------------------
 211     /**
 212      * Obtains an instance of {@code LocalDateTime} from year, month,
 213      * day, hour and minute, setting the second and nanosecond to zero.
 214      * <p>


 215      * The day must be valid for the year and month, otherwise an exception will be thrown.
 216      * The second and nanosecond fields will be set to zero.
 217      *
 218      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 219      * @param month  the month-of-year to represent, not null
 220      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 221      * @param hour  the hour-of-day to represent, from 0 to 23
 222      * @param minute  the minute-of-hour to represent, from 0 to 59
 223      * @return the local date-time, not null
 224      * @throws DateTimeException if the value of any field is out of range
 225      * @throws DateTimeException if the day-of-month is invalid for the month-year
 226      */
 227     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) {
 228         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 229         LocalTime time = LocalTime.of(hour, minute);
 230         return new LocalDateTime(date, time);
 231     }
 232 
 233     /**
 234      * Obtains an instance of {@code LocalDateTime} from year, month,
 235      * day, hour, minute and second, setting the nanosecond to zero.
 236      * <p>


 237      * The day must be valid for the year and month, otherwise an exception will be thrown.
 238      * The nanosecond field will be set to zero.
 239      *
 240      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 241      * @param month  the month-of-year to represent, not null
 242      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 243      * @param hour  the hour-of-day to represent, from 0 to 23
 244      * @param minute  the minute-of-hour to represent, from 0 to 59
 245      * @param second  the second-of-minute to represent, from 0 to 59
 246      * @return the local date-time, not null
 247      * @throws DateTimeException if the value of any field is out of range
 248      * @throws DateTimeException if the day-of-month is invalid for the month-year
 249      */
 250     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
 251         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 252         LocalTime time = LocalTime.of(hour, minute, second);
 253         return new LocalDateTime(date, time);
 254     }
 255 
 256     /**
 257      * Obtains an instance of {@code LocalDateTime} from year, month,
 258      * day, hour, minute, second and nanosecond.
 259      * <p>


 260      * The day must be valid for the year and month, otherwise an exception will be thrown.
 261      *
 262      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 263      * @param month  the month-of-year to represent, not null
 264      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 265      * @param hour  the hour-of-day to represent, from 0 to 23
 266      * @param minute  the minute-of-hour to represent, from 0 to 59
 267      * @param second  the second-of-minute to represent, from 0 to 59
 268      * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
 269      * @return the local date-time, not null
 270      * @throws DateTimeException if the value of any field is out of range
 271      * @throws DateTimeException if the day-of-month is invalid for the month-year
 272      */
 273     public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
 274         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 275         LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
 276         return new LocalDateTime(date, time);
 277     }
 278 
 279     //-----------------------------------------------------------------------
 280     /**
 281      * Obtains an instance of {@code LocalDateTime} from year, month,
 282      * day, hour and minute, setting the second and nanosecond to zero.
 283      * <p>


 284      * The day must be valid for the year and month, otherwise an exception will be thrown.
 285      * The second and nanosecond fields will be set to zero.
 286      *
 287      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 288      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 289      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 290      * @param hour  the hour-of-day to represent, from 0 to 23
 291      * @param minute  the minute-of-hour to represent, from 0 to 59
 292      * @return the local date-time, not null
 293      * @throws DateTimeException if the value of any field is out of range
 294      * @throws DateTimeException if the day-of-month is invalid for the month-year
 295      */
 296     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) {
 297         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 298         LocalTime time = LocalTime.of(hour, minute);
 299         return new LocalDateTime(date, time);
 300     }
 301 
 302     /**
 303      * Obtains an instance of {@code LocalDateTime} from year, month,
 304      * day, hour, minute and second, setting the nanosecond to zero.
 305      * <p>


 306      * The day must be valid for the year and month, otherwise an exception will be thrown.
 307      * The nanosecond field will be set to zero.
 308      *
 309      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 310      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 311      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 312      * @param hour  the hour-of-day to represent, from 0 to 23
 313      * @param minute  the minute-of-hour to represent, from 0 to 59
 314      * @param second  the second-of-minute to represent, from 0 to 59
 315      * @return the local date-time, not null
 316      * @throws DateTimeException if the value of any field is out of range
 317      * @throws DateTimeException if the day-of-month is invalid for the month-year
 318      */
 319     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) {
 320         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 321         LocalTime time = LocalTime.of(hour, minute, second);
 322         return new LocalDateTime(date, time);
 323     }
 324 
 325     /**
 326      * Obtains an instance of {@code LocalDateTime} from year, month,
 327      * day, hour, minute, second and nanosecond.
 328      * <p>


 329      * The day must be valid for the year and month, otherwise an exception will be thrown.
 330      *
 331      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 332      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 333      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 334      * @param hour  the hour-of-day to represent, from 0 to 23
 335      * @param minute  the minute-of-hour to represent, from 0 to 59
 336      * @param second  the second-of-minute to represent, from 0 to 59
 337      * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
 338      * @return the local date-time, not null
 339      * @throws DateTimeException if the value of any field is out of range
 340      * @throws DateTimeException if the day-of-month is invalid for the month-year
 341      */
 342     public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
 343         LocalDate date = LocalDate.of(year, month, dayOfMonth);
 344         LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
 345         return new LocalDateTime(date, time);
 346     }
 347 
 348     /**
 349      * Obtains an instance of {@code LocalDateTime} from a date and time.
 350      *
 351      * @param date  the local date, not null
 352      * @param time  the local time, not null
 353      * @return the local date-time, not null
 354      */
 355     public static LocalDateTime of(LocalDate date, LocalTime time) {
 356         Objects.requireNonNull(date, "date");
 357         Objects.requireNonNull(time, "time");
 358         return new LocalDateTime(date, time);
 359     }
 360 
 361     //-------------------------------------------------------------------------
 362     /**
 363      * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID.
 364      * <p>
 365      * This creates a local date-time based on the specified instant.
 366      * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
 367      * which is simple as there is only one valid offset for each instant.
 368      * Then, the instant and offset are used to calculate the local date-time.
 369      *
 370      * @param instant  the instant to create the date-time from, not null
 371      * @param zone  the time-zone, which may be an offset, not null
 372      * @return the local date-time, not null
 373      * @throws DateTimeException if the result exceeds the supported range
 374      */
 375     public static LocalDateTime ofInstant(Instant instant, ZoneId zone) {
 376         Objects.requireNonNull(instant, "instant");
 377         Objects.requireNonNull(zone, "zone");
 378         ZoneRules rules = zone.getRules();
 379         ZoneOffset offset = rules.getOffset(instant);
 380         return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
 381     }
 382 
 383     /**
 384      * Obtains an instance of {@code LocalDateTime} using seconds from the
 385      * epoch of 1970-01-01T00:00:00Z.
 386      * <p>
 387      * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field
 388      * to be converted to a local date-time. This is primarily intended for
 389      * low-level conversions rather than general application usage.
 390      *
 391      * @param epochSecond  the number of seconds from the epoch of 1970-01-01T00:00:00Z
 392      * @param nanoOfSecond  the nanosecond within the second, from 0 to 999,999,999
 393      * @param offset  the zone offset, not null
 394      * @return the local date-time, not null
 395      * @throws DateTimeException if the result exceeds the supported range

 396      */
 397     public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) {
 398         Objects.requireNonNull(offset, "offset");

 399         long localSecond = epochSecond + offset.getTotalSeconds();  // overflow caught later
 400         long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
 401         int secsOfDay = (int)Math.floorMod(localSecond, SECONDS_PER_DAY);
 402         LocalDate date = LocalDate.ofEpochDay(localEpochDay);
 403         LocalTime time = LocalTime.ofSecondOfDay(secsOfDay, nanoOfSecond);
 404         return new LocalDateTime(date, time);
 405     }
 406 
 407     //-----------------------------------------------------------------------
 408     /**
 409      * Obtains an instance of {@code LocalDateTime} from a temporal object.
 410      * <p>
 411      * A {@code TemporalAccessor} represents some form of date and time information.
 412      * This factory converts the arbitrary temporal object to an instance of {@code LocalDateTime}.
 413      * <p>
 414      * The conversion extracts and combines {@code LocalDate} and {@code LocalTime}.




 415      * <p>
 416      * This method matches the signature of the functional interface {@link TemporalQuery}
 417      * allowing it to be used as a query via method reference, {@code LocalDateTime::from}.
 418      *
 419      * @param temporal  the temporal object to convert, not null
 420      * @return the local date-time, not null
 421      * @throws DateTimeException if unable to convert to a {@code LocalDateTime}
 422      */
 423     public static LocalDateTime from(TemporalAccessor temporal) {
 424         if (temporal instanceof LocalDateTime) {
 425             return (LocalDateTime) temporal;
 426         } else if (temporal instanceof ZonedDateTime) {
 427             return ((ZonedDateTime) temporal).getDateTime();


 428         }
 429         try {
 430             LocalDate date = LocalDate.from(temporal);
 431             LocalTime time = LocalTime.from(temporal);
 432             return new LocalDateTime(date, time);
 433         } catch (DateTimeException ex) {
 434             throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " + temporal.getClass(), ex);
 435         }
 436     }
 437 
 438     //-----------------------------------------------------------------------
 439     /**
 440      * Obtains an instance of {@code LocalDateTime} from a text string such as {@code 2007-12-03T10:15:30}.
 441      * <p>
 442      * The string must represent a valid date-time and is parsed using
 443      * {@link java.time.format.DateTimeFormatters#isoLocalDateTime()}.
 444      *
 445      * @param text  the text to parse such as "2007-12-03T10:15:30", not null
 446      * @return the parsed local date-time, not null
 447      * @throws DateTimeParseException if the text cannot be parsed
 448      */
 449     public static LocalDateTime parse(CharSequence text) {
 450         return parse(text, DateTimeFormatters.isoLocalDateTime());
 451     }
 452 
 453     /**
 454      * Obtains an instance of {@code LocalDateTime} from a text string using a specific formatter.
 455      * <p>
 456      * The text is parsed using the formatter, returning a date-time.
 457      *
 458      * @param text  the text to parse, not null
 459      * @param formatter  the formatter to use, not null
 460      * @return the parsed local date-time, not null
 461      * @throws DateTimeParseException if the text cannot be parsed
 462      */
 463     public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) {
 464         Objects.requireNonNull(formatter, "formatter");
 465         return formatter.parse(text, LocalDateTime::from);
 466     }
 467 
 468     //-----------------------------------------------------------------------
 469     /**
 470      * Constructor.
 471      *
 472      * @param date  the date part of the date-time, validated not null
 473      * @param time  the time part of the date-time, validated not null
 474      */
 475     private LocalDateTime(LocalDate date, LocalTime time) {
 476         this.date = date;
 477         this.time = time;
 478     }
 479 
 480     /**
 481      * Returns a copy of this date-time with the new date and time, checking
 482      * to see if a new object is in fact required.
 483      *
 484      * @param newDate  the date of the new date-time, not null
 485      * @param newTime  the time of the new date-time, not null
 486      * @return the date-time, not null
 487      */
 488     private LocalDateTime with(LocalDate newDate, LocalTime newTime) {
 489         if (date == newDate && time == newTime) {
 490             return this;
 491         }
 492         return new LocalDateTime(newDate, newTime);
 493     }
 494 
 495     //-----------------------------------------------------------------------
 496     /**
 497      * Checks if the specified field is supported.
 498      * <p>
 499      * This checks if this date-time can be queried for the specified field.
 500      * If false, then calling the {@link #range(TemporalField) range} and
 501      * {@link #get(TemporalField) get} methods will throw an exception.
 502      * <p>
 503      * If the field is a {@link ChronoField} then the query is implemented here.
 504      * The supported fields are:
 505      * <ul>
 506      * <li>{@code NANO_OF_SECOND}
 507      * <li>{@code NANO_OF_DAY}
 508      * <li>{@code MICRO_OF_SECOND}
 509      * <li>{@code MICRO_OF_DAY}
 510      * <li>{@code MILLI_OF_SECOND}
 511      * <li>{@code MILLI_OF_DAY}
 512      * <li>{@code SECOND_OF_MINUTE}
 513      * <li>{@code SECOND_OF_DAY}
 514      * <li>{@code MINUTE_OF_HOUR}
 515      * <li>{@code MINUTE_OF_DAY}
 516      * <li>{@code HOUR_OF_AMPM}
 517      * <li>{@code CLOCK_HOUR_OF_AMPM}
 518      * <li>{@code HOUR_OF_DAY}
 519      * <li>{@code CLOCK_HOUR_OF_DAY}
 520      * <li>{@code AMPM_OF_DAY}
 521      * <li>{@code DAY_OF_WEEK}
 522      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
 523      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
 524      * <li>{@code DAY_OF_MONTH}
 525      * <li>{@code DAY_OF_YEAR}
 526      * <li>{@code EPOCH_DAY}
 527      * <li>{@code ALIGNED_WEEK_OF_MONTH}
 528      * <li>{@code ALIGNED_WEEK_OF_YEAR}
 529      * <li>{@code MONTH_OF_YEAR}
 530      * <li>{@code EPOCH_MONTH}
 531      * <li>{@code YEAR_OF_ERA}
 532      * <li>{@code YEAR}
 533      * <li>{@code ERA}
 534      * </ul>
 535      * All other {@code ChronoField} instances will return false.
 536      * <p>
 537      * If the field is not a {@code ChronoField}, then the result of this method
 538      * is obtained by invoking {@code TemporalField.doIsSupported(TemporalAccessor)}
 539      * passing {@code this} as the argument.
 540      * Whether the field is supported is determined by the field.
 541      *
 542      * @param field  the field to check, null returns false
 543      * @return true if the field is supported on this date-time, false if not
 544      */
 545     @Override
 546     public boolean isSupported(TemporalField field) {
 547         if (field instanceof ChronoField) {
 548             ChronoField f = (ChronoField) field;
 549             return f.isDateField() || f.isTimeField();
 550         }
 551         return field != null && field.doIsSupported(this);
 552     }
 553 
 554     /**
 555      * Gets the range of valid values for the specified field.
 556      * <p>
 557      * The range object expresses the minimum and maximum valid values for a field.
 558      * This date-time is used to enhance the accuracy of the returned range.
 559      * If it is not possible to return the range, because the field is not supported
 560      * or for some other reason, an exception is thrown.
 561      * <p>
 562      * If the field is a {@link ChronoField} then the query is implemented here.
 563      * The {@link #isSupported(TemporalField) supported fields} will return
 564      * appropriate range instances.
 565      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 566      * <p>
 567      * If the field is not a {@code ChronoField}, then the result of this method
 568      * is obtained by invoking {@code TemporalField.doRange(TemporalAccessor)}
 569      * passing {@code this} as the argument.
 570      * Whether the range can be obtained is determined by the field.
 571      *
 572      * @param field  the field to query the range for, not null
 573      * @return the range of valid values for the field, not null
 574      * @throws DateTimeException if the range for the field cannot be obtained
 575      */
 576     @Override
 577     public ValueRange range(TemporalField field) {
 578         if (field instanceof ChronoField) {
 579             ChronoField f = (ChronoField) field;
 580             return (f.isTimeField() ? time.range(field) : date.range(field));
 581         }
 582         return field.doRange(this);
 583     }
 584 
 585     /**
 586      * Gets the value of the specified field from this date-time as an {@code int}.
 587      * <p>
 588      * This queries this date-time for the value for the specified field.
 589      * The returned value will always be within the valid range of values for the field.
 590      * If it is not possible to return the value, because the field is not supported
 591      * or for some other reason, an exception is thrown.
 592      * <p>
 593      * If the field is a {@link ChronoField} then the query is implemented here.
 594      * The {@link #isSupported(TemporalField) supported fields} will return valid
 595      * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
 596      * {@code EPOCH_DAY} and {@code EPOCH_MONTH} which are too large to fit in
 597      * an {@code int} and throw a {@code DateTimeException}.
 598      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 599      * <p>
 600      * If the field is not a {@code ChronoField}, then the result of this method
 601      * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)}
 602      * passing {@code this} as the argument. Whether the value can be obtained,
 603      * and what the value represents, is determined by the field.
 604      *
 605      * @param field  the field to get, not null
 606      * @return the value for the field
 607      * @throws DateTimeException if a value for the field cannot be obtained
 608      * @throws ArithmeticException if numeric overflow occurs
 609      */
 610     @Override
 611     public int get(TemporalField field) {
 612         if (field instanceof ChronoField) {
 613             ChronoField f = (ChronoField) field;
 614             return (f.isTimeField() ? time.get(field) : date.get(field));
 615         }
 616         return ChronoLocalDateTime.super.get(field);
 617     }
 618 
 619     /**
 620      * Gets the value of the specified field from this date-time as a {@code long}.
 621      * <p>
 622      * This queries this date-time for the value for the specified field.
 623      * If it is not possible to return the value, because the field is not supported
 624      * or for some other reason, an exception is thrown.
 625      * <p>
 626      * If the field is a {@link ChronoField} then the query is implemented here.
 627      * The {@link #isSupported(TemporalField) supported fields} will return valid
 628      * values based on this date-time.
 629      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 630      * <p>
 631      * If the field is not a {@code ChronoField}, then the result of this method
 632      * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)}
 633      * passing {@code this} as the argument. Whether the value can be obtained,
 634      * and what the value represents, is determined by the field.
 635      *
 636      * @param field  the field to get, not null
 637      * @return the value for the field
 638      * @throws DateTimeException if a value for the field cannot be obtained
 639      * @throws ArithmeticException if numeric overflow occurs
 640      */
 641     @Override
 642     public long getLong(TemporalField field) {
 643         if (field instanceof ChronoField) {
 644             ChronoField f = (ChronoField) field;
 645             return (f.isTimeField() ? time.getLong(field) : date.getLong(field));
 646         }
 647         return field.doGet(this);
 648     }
 649 
 650     //-----------------------------------------------------------------------
 651     /**
 652      * Gets the {@code LocalDate} part of this date-time.
 653      * <p>
 654      * This returns a {@code LocalDate} with the same year, month and day
 655      * as this date-time.
 656      *
 657      * @return the date part of this date-time, not null
 658      */
 659     @Override
 660     public LocalDate getDate() {
 661         return date;
 662     }
 663 
 664     /**
 665      * Gets the year field.
 666      * <p>
 667      * This method returns the primitive {@code int} value for the year.
 668      * <p>
 669      * The year returned by this method is proleptic as per {@code get(YEAR)}.
 670      * To obtain the year-of-era, use {@code get(YEAR_OF_ERA}.
 671      *
 672      * @return the year, from MIN_YEAR to MAX_YEAR
 673      */
 674     public int getYear() {
 675         return date.getYear();
 676     }
 677 
 678     /**
 679      * Gets the month-of-year field from 1 to 12.
 680      * <p>
 681      * This method returns the month as an {@code int} from 1 to 12.
 682      * Application code is frequently clearer if the enum {@link Month}
 683      * is used by calling {@link #getMonth()}.
 684      *
 685      * @return the month-of-year, from 1 to 12
 686      * @see #getMonth()
 687      */
 688     public int getMonthValue() {
 689         return date.getMonthValue();
 690     }
 691 
 692     /**
 693      * Gets the month-of-year field using the {@code Month} enum.
 694      * <p>
 695      * This method returns the enum {@link Month} for the month.
 696      * This avoids confusion as to what {@code int} values mean.
 697      * If you need access to the primitive {@code int} value then the enum
 698      * provides the {@link Month#getValue() int value}.
 699      *
 700      * @return the month-of-year, not null
 701      * @see #getMonthValue()
 702      */
 703     public Month getMonth() {
 704         return date.getMonth();
 705     }
 706 
 707     /**
 708      * Gets the day-of-month field.
 709      * <p>
 710      * This method returns the primitive {@code int} value for the day-of-month.
 711      *
 712      * @return the day-of-month, from 1 to 31
 713      */
 714     public int getDayOfMonth() {
 715         return date.getDayOfMonth();
 716     }
 717 
 718     /**
 719      * Gets the day-of-year field.
 720      * <p>
 721      * This method returns the primitive {@code int} value for the day-of-year.
 722      *
 723      * @return the day-of-year, from 1 to 365, or 366 in a leap year
 724      */
 725     public int getDayOfYear() {
 726         return date.getDayOfYear();
 727     }
 728 
 729     /**
 730      * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
 731      * <p>
 732      * This method returns the enum {@link DayOfWeek} for the day-of-week.
 733      * This avoids confusion as to what {@code int} values mean.
 734      * If you need access to the primitive {@code int} value then the enum
 735      * provides the {@link DayOfWeek#getValue() int value}.
 736      * <p>
 737      * Additional information can be obtained from the {@code DayOfWeek}.
 738      * This includes textual names of the values.
 739      *
 740      * @return the day-of-week, not null
 741      */
 742     public DayOfWeek getDayOfWeek() {
 743         return date.getDayOfWeek();
 744     }
 745 
 746     //-----------------------------------------------------------------------
 747     /**
 748      * Gets the {@code LocalTime} part of this date-time.
 749      * <p>
 750      * This returns a {@code LocalTime} with the same hour, minute, second and
 751      * nanosecond as this date-time.
 752      *
 753      * @return the time part of this date-time, not null
 754      */
 755     @Override
 756     public LocalTime getTime() {
 757         return time;
 758     }
 759 
 760     /**
 761      * Gets the hour-of-day field.
 762      *
 763      * @return the hour-of-day, from 0 to 23
 764      */
 765     public int getHour() {
 766         return time.getHour();
 767     }
 768 
 769     /**
 770      * Gets the minute-of-hour field.
 771      *
 772      * @return the minute-of-hour, from 0 to 59
 773      */
 774     public int getMinute() {
 775         return time.getMinute();
 776     }
 777 
 778     /**
 779      * Gets the second-of-minute field.
 780      *
 781      * @return the second-of-minute, from 0 to 59
 782      */
 783     public int getSecond() {
 784         return time.getSecond();
 785     }
 786 
 787     /**
 788      * Gets the nano-of-second field.
 789      *
 790      * @return the nano-of-second, from 0 to 999,999,999
 791      */
 792     public int getNano() {
 793         return time.getNano();
 794     }
 795 
 796     //-----------------------------------------------------------------------
 797     /**
 798      * Returns an adjusted copy of this date-time.
 799      * <p>
 800      * This returns a new {@code LocalDateTime}, based on this one, with the date-time adjusted.
 801      * The adjustment takes place using the specified adjuster strategy object.
 802      * Read the documentation of the adjuster to understand what adjustment will be made.
 803      * <p>
 804      * A simple adjuster might simply set the one of the fields, such as the year field.
 805      * A more complex adjuster might set the date to the last day of the month.
 806      * A selection of common adjustments is provided in {@link java.time.temporal.Adjusters}.
 807      * These include finding the "last day of the month" and "next Wednesday".
 808      * Key date-time classes also implement the {@code TemporalAdjuster} interface,
 809      * such as {@link Month} and {@link java.time.temporal.MonthDay MonthDay}.
 810      * The adjuster is responsible for handling special cases, such as the varying
 811      * lengths of month and leap years.
 812      * <p>
 813      * For example this code returns a date on the last day of July:
 814      * <pre>
 815      *  import static java.time.Month.*;
 816      *  import static java.time.temporal.Adjusters.*;
 817      *
 818      *  result = localDateTime.with(JULY).with(lastDayOfMonth());
 819      * </pre>
 820      * <p>
 821      * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster},
 822      * thus this method can be used to change the date, time or offset:
 823      * <pre>
 824      *  result = localDateTime.with(date);
 825      *  result = localDateTime.with(time);
 826      * </pre>
 827      * <p>
 828      * The result of this method is obtained by invoking the
 829      * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
 830      * specified adjuster passing {@code this} as the argument.
 831      * <p>
 832      * This instance is immutable and unaffected by this method call.
 833      *
 834      * @param adjuster the adjuster to use, not null
 835      * @return a {@code LocalDateTime} based on {@code this} with the adjustment made, not null
 836      * @throws DateTimeException if the adjustment cannot be made
 837      * @throws ArithmeticException if numeric overflow occurs
 838      */
 839     @Override
 840     public LocalDateTime with(TemporalAdjuster adjuster) {
 841         // optimizations
 842         if (adjuster instanceof LocalDate) {
 843             return with((LocalDate) adjuster, time);
 844         } else if (adjuster instanceof LocalTime) {
 845             return with(date, (LocalTime) adjuster);
 846         } else if (adjuster instanceof LocalDateTime) {
 847             return (LocalDateTime) adjuster;
 848         }
 849         return (LocalDateTime) adjuster.adjustInto(this);
 850     }
 851 
 852     /**
 853      * Returns a copy of this date-time with the specified field set to a new value.
 854      * <p>
 855      * This returns a new {@code LocalDateTime}, based on this one, with the value
 856      * for the specified field changed.
 857      * This can be used to change any supported field, such as the year, month or day-of-month.
 858      * If it is not possible to set the value, because the field is not supported or for
 859      * some other reason, an exception is thrown.
 860      * <p>
 861      * In some cases, changing the specified field can cause the resulting date-time to become invalid,
 862      * such as changing the month from 31st January to February would make the day-of-month invalid.
 863      * In cases like this, the field is responsible for resolving the date. Typically it will choose
 864      * the previous valid date, which would be the last valid day of February in this example.
 865      * <p>
 866      * If the field is a {@link ChronoField} then the adjustment is implemented here.
 867      * The {@link #isSupported(TemporalField) supported fields} will behave as per
 868      * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate}
 869      * or {@link LocalTime#with(TemporalField, long) LocalTime}.
 870      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 871      * <p>
 872      * If the field is not a {@code ChronoField}, then the result of this method
 873      * is obtained by invoking {@code TemporalField.doWith(Temporal, long)}
 874      * passing {@code this} as the argument. In this case, the field determines
 875      * whether and how to adjust the instant.
 876      * <p>
 877      * This instance is immutable and unaffected by this method call.
 878      *
 879      * @param field  the field to set in the result, not null
 880      * @param newValue  the new value of the field in the result
 881      * @return a {@code LocalDateTime} based on {@code this} with the specified field set, not null
 882      * @throws DateTimeException if the field cannot be set
 883      * @throws ArithmeticException if numeric overflow occurs
 884      */
 885     @Override
 886     public LocalDateTime with(TemporalField field, long newValue) {
 887         if (field instanceof ChronoField) {
 888             ChronoField f = (ChronoField) field;
 889             if (f.isTimeField()) {
 890                 return with(date, time.with(field, newValue));
 891             } else {
 892                 return with(date.with(field, newValue), time);
 893             }
 894         }
 895         return field.doWith(this, newValue);
 896     }
 897 
 898     //-----------------------------------------------------------------------
 899     /**
 900      * Returns a copy of this {@code LocalDateTime} with the year altered.
 901      * The time does not affect the calculation and will be the same in the result.
 902      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 903      * <p>
 904      * This instance is immutable and unaffected by this method call.
 905      *
 906      * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
 907      * @return a {@code LocalDateTime} based on this date-time with the requested year, not null
 908      * @throws DateTimeException if the year value is invalid
 909      */
 910     public LocalDateTime withYear(int year) {
 911         return with(date.withYear(year), time);
 912     }
 913 
 914     /**
 915      * Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
 916      * The time does not affect the calculation and will be the same in the result.
 917      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 918      * <p>
 919      * This instance is immutable and unaffected by this method call.
 920      *
 921      * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
 922      * @return a {@code LocalDateTime} based on this date-time with the requested month, not null
 923      * @throws DateTimeException if the month-of-year value is invalid
 924      */
 925     public LocalDateTime withMonth(int month) {
 926         return with(date.withMonth(month), time);
 927     }
 928 
 929     /**
 930      * Returns a copy of this {@code LocalDateTime} with the day-of-month altered.
 931      * If the resulting {@code LocalDateTime} is invalid, an exception is thrown.
 932      * The time does not affect the calculation and will be the same in the result.
 933      * <p>
 934      * This instance is immutable and unaffected by this method call.
 935      *
 936      * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
 937      * @return a {@code LocalDateTime} based on this date-time with the requested day, not null
 938      * @throws DateTimeException if the day-of-month value is invalid
 939      * @throws DateTimeException if the day-of-month is invalid for the month-year
 940      */
 941     public LocalDateTime withDayOfMonth(int dayOfMonth) {
 942         return with(date.withDayOfMonth(dayOfMonth), time);
 943     }
 944 
 945     /**
 946      * Returns a copy of this {@code LocalDateTime} with the day-of-year altered.
 947      * If the resulting {@code LocalDateTime} is invalid, an exception is thrown.
 948      * <p>
 949      * This instance is immutable and unaffected by this method call.
 950      *
 951      * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
 952      * @return a {@code LocalDateTime} based on this date with the requested day, not null
 953      * @throws DateTimeException if the day-of-year value is invalid
 954      * @throws DateTimeException if the day-of-year is invalid for the year
 955      */
 956     public LocalDateTime withDayOfYear(int dayOfYear) {
 957         return with(date.withDayOfYear(dayOfYear), time);
 958     }
 959 
 960     //-----------------------------------------------------------------------
 961     /**
 962      * Returns a copy of this {@code LocalDateTime} with the hour-of-day value altered.
 963      * <p>
 964      * This instance is immutable and unaffected by this method call.
 965      *
 966      * @param hour  the hour-of-day to set in the result, from 0 to 23
 967      * @return a {@code LocalDateTime} based on this date-time with the requested hour, not null
 968      * @throws DateTimeException if the hour value is invalid
 969      */
 970     public LocalDateTime withHour(int hour) {
 971         LocalTime newTime = time.withHour(hour);
 972         return with(date, newTime);
 973     }
 974 
 975     /**
 976      * Returns a copy of this {@code LocalDateTime} with the minute-of-hour value altered.
 977      * <p>
 978      * This instance is immutable and unaffected by this method call.
 979      *
 980      * @param minute  the minute-of-hour to set in the result, from 0 to 59
 981      * @return a {@code LocalDateTime} based on this date-time with the requested minute, not null
 982      * @throws DateTimeException if the minute value is invalid
 983      */
 984     public LocalDateTime withMinute(int minute) {
 985         LocalTime newTime = time.withMinute(minute);
 986         return with(date, newTime);
 987     }
 988 
 989     /**
 990      * Returns a copy of this {@code LocalDateTime} with the second-of-minute value altered.
 991      * <p>
 992      * This instance is immutable and unaffected by this method call.
 993      *
 994      * @param second  the second-of-minute to set in the result, from 0 to 59
 995      * @return a {@code LocalDateTime} based on this date-time with the requested second, not null
 996      * @throws DateTimeException if the second value is invalid
 997      */
 998     public LocalDateTime withSecond(int second) {
 999         LocalTime newTime = time.withSecond(second);
1000         return with(date, newTime);
1001     }
1002 
1003     /**
1004      * Returns a copy of this {@code LocalDateTime} with the nano-of-second value altered.
1005      * <p>
1006      * This instance is immutable and unaffected by this method call.
1007      *
1008      * @param nanoOfSecond  the nano-of-second to set in the result, from 0 to 999,999,999
1009      * @return a {@code LocalDateTime} based on this date-time with the requested nanosecond, not null
1010      * @throws DateTimeException if the nano value is invalid
1011      */
1012     public LocalDateTime withNano(int nanoOfSecond) {
1013         LocalTime newTime = time.withNano(nanoOfSecond);
1014         return with(date, newTime);
1015     }
1016 
1017     //-----------------------------------------------------------------------
1018     /**
1019      * Returns a copy of this {@code LocalDateTime} with the time truncated.
1020      * <p>
1021      * Truncation returns a copy of the original date-time with fields
1022      * smaller than the specified unit set to zero.
1023      * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1024      * will set the second-of-minute and nano-of-second field to zero.
1025      * <p>
1026      * Not all units are accepted. The {@link ChronoUnit#DAYS days} unit and time
1027      * units with an exact duration can be used, other units throw an exception.


1028      * <p>
1029      * This instance is immutable and unaffected by this method call.
1030      *
1031      * @param unit  the unit to truncate to, not null
1032      * @return a {@code LocalDateTime} based on this date-time with the time truncated, not null
1033      * @throws DateTimeException if unable to truncate
1034      */
1035     public LocalDateTime truncatedTo(TemporalUnit unit) {
1036         return with(date, time.truncatedTo(unit));
1037     }
1038 
1039     //-----------------------------------------------------------------------
1040     /**
1041      * Returns a copy of this date-time with the specified period added.
1042      * <p>
1043      * This method returns a new date-time based on this time with the specified period added.
1044      * The adder is typically {@link Period} but may be any other type implementing
1045      * the {@link TemporalAdder} interface.
1046      * The calculation is delegated to the specified adjuster, which typically calls
1047      * back to {@link #plus(long, TemporalUnit)}.




1048      * <p>
1049      * This instance is immutable and unaffected by this method call.
1050      *
1051      * @param adder  the adder to use, not null
1052      * @return a {@code LocalDateTime} based on this date-time with the addition made, not null
1053      * @throws DateTimeException if the addition cannot be made
1054      * @throws ArithmeticException if numeric overflow occurs
1055      */
1056     @Override
1057     public LocalDateTime plus(TemporalAdder adder) {
1058         return (LocalDateTime) adder.addTo(this);
1059     }
1060 
1061     /**
1062      * Returns a copy of this date-time with the specified period added.




1063      * <p>
1064      * This method returns a new date-time based on this date-time with the specified period added.
1065      * This can be used to add any period that is defined by a unit, for example to add years, months or days.
1066      * The unit is responsible for the details of the calculation, including the resolution
1067      * of any edge cases in the calculation.





1068      * <p>
1069      * This instance is immutable and unaffected by this method call.
1070      *
1071      * @param amountToAdd  the amount of the unit to add to the result, may be negative
1072      * @param unit  the unit of the period to add, not null
1073      * @return a {@code LocalDateTime} based on this date-time with the specified period added, not null
1074      * @throws DateTimeException if the unit cannot be added to this type

1075      */
1076     @Override
1077     public LocalDateTime plus(long amountToAdd, TemporalUnit unit) {
1078         if (unit instanceof ChronoUnit) {
1079             ChronoUnit f = (ChronoUnit) unit;
1080             switch (f) {
1081                 case NANOS: return plusNanos(amountToAdd);
1082                 case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
1083                 case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
1084                 case SECONDS: return plusSeconds(amountToAdd);
1085                 case MINUTES: return plusMinutes(amountToAdd);
1086                 case HOURS: return plusHours(amountToAdd);
1087                 case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);  // no overflow (256 is multiple of 2)
1088             }
1089             return with(date.plus(amountToAdd, unit), time);
1090         }
1091         return unit.doPlus(this, amountToAdd);
1092     }
1093 
1094     //-----------------------------------------------------------------------
1095     /**
1096      * Returns a copy of this {@code LocalDateTime} with the specified period in years added.
1097      * <p>
1098      * This method adds the specified amount to the years field in three steps:
1099      * <ol>
1100      * <li>Add the input years to the year field</li>
1101      * <li>Check if the resulting date would be invalid</li>
1102      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1103      * </ol>
1104      * <p>
1105      * For example, 2008-02-29 (leap year) plus one year would result in the
1106      * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1107      * result, the last valid day of the month, 2009-02-28, is selected instead.
1108      * <p>
1109      * This instance is immutable and unaffected by this method call.
1110      *
1111      * @param years  the years to add, may be negative
1112      * @return a {@code LocalDateTime} based on this date-time with the years added, not null
1113      * @throws DateTimeException if the result exceeds the supported date range
1114      */
1115     public LocalDateTime plusYears(long years) {
1116         LocalDate newDate = date.plusYears(years);
1117         return with(newDate, time);
1118     }
1119 
1120     /**
1121      * Returns a copy of this {@code LocalDateTime} with the specified period in months added.
1122      * <p>
1123      * This method adds the specified amount to the months field in three steps:
1124      * <ol>
1125      * <li>Add the input months to the month-of-year field</li>
1126      * <li>Check if the resulting date would be invalid</li>
1127      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1128      * </ol>
1129      * <p>
1130      * For example, 2007-03-31 plus one month would result in the invalid date
1131      * 2007-04-31. Instead of returning an invalid result, the last valid day
1132      * of the month, 2007-04-30, is selected instead.
1133      * <p>
1134      * This instance is immutable and unaffected by this method call.
1135      *
1136      * @param months  the months to add, may be negative
1137      * @return a {@code LocalDateTime} based on this date-time with the months added, not null
1138      * @throws DateTimeException if the result exceeds the supported date range
1139      */
1140     public LocalDateTime plusMonths(long months) {
1141         LocalDate newDate = date.plusMonths(months);
1142         return with(newDate, time);
1143     }
1144 
1145     /**
1146      * Returns a copy of this {@code LocalDateTime} with the specified period in weeks added.
1147      * <p>
1148      * This method adds the specified amount in weeks to the days field incrementing
1149      * the month and year fields as necessary to ensure the result remains valid.
1150      * The result is only invalid if the maximum/minimum year is exceeded.
1151      * <p>
1152      * For example, 2008-12-31 plus one week would result in 2009-01-07.
1153      * <p>
1154      * This instance is immutable and unaffected by this method call.
1155      *
1156      * @param weeks  the weeks to add, may be negative
1157      * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null
1158      * @throws DateTimeException if the result exceeds the supported date range
1159      */
1160     public LocalDateTime plusWeeks(long weeks) {
1161         LocalDate newDate = date.plusWeeks(weeks);
1162         return with(newDate, time);
1163     }
1164 
1165     /**
1166      * Returns a copy of this {@code LocalDateTime} with the specified period in days added.
1167      * <p>
1168      * This method adds the specified amount to the days field incrementing the
1169      * month and year fields as necessary to ensure the result remains valid.
1170      * The result is only invalid if the maximum/minimum year is exceeded.
1171      * <p>
1172      * For example, 2008-12-31 plus one day would result in 2009-01-01.
1173      * <p>
1174      * This instance is immutable and unaffected by this method call.
1175      *
1176      * @param days  the days to add, may be negative
1177      * @return a {@code LocalDateTime} based on this date-time with the days added, not null
1178      * @throws DateTimeException if the result exceeds the supported date range
1179      */
1180     public LocalDateTime plusDays(long days) {
1181         LocalDate newDate = date.plusDays(days);
1182         return with(newDate, time);
1183     }
1184 
1185     //-----------------------------------------------------------------------
1186     /**
1187      * Returns a copy of this {@code LocalDateTime} with the specified period in hours added.
1188      * <p>
1189      * This instance is immutable and unaffected by this method call.
1190      *
1191      * @param hours  the hours to add, may be negative
1192      * @return a {@code LocalDateTime} based on this date-time with the hours added, not null
1193      * @throws DateTimeException if the result exceeds the supported date range
1194      */
1195     public LocalDateTime plusHours(long hours) {
1196         return plusWithOverflow(date, hours, 0, 0, 0, 1);
1197     }
1198 
1199     /**
1200      * Returns a copy of this {@code LocalDateTime} with the specified period in minutes added.
1201      * <p>
1202      * This instance is immutable and unaffected by this method call.
1203      *
1204      * @param minutes  the minutes to add, may be negative
1205      * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null
1206      * @throws DateTimeException if the result exceeds the supported date range
1207      */
1208     public LocalDateTime plusMinutes(long minutes) {
1209         return plusWithOverflow(date, 0, minutes, 0, 0, 1);
1210     }
1211 
1212     /**
1213      * Returns a copy of this {@code LocalDateTime} with the specified period in seconds added.
1214      * <p>
1215      * This instance is immutable and unaffected by this method call.
1216      *
1217      * @param seconds  the seconds to add, may be negative
1218      * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null
1219      * @throws DateTimeException if the result exceeds the supported date range
1220      */
1221     public LocalDateTime plusSeconds(long seconds) {
1222         return plusWithOverflow(date, 0, 0, seconds, 0, 1);
1223     }
1224 
1225     /**
1226      * Returns a copy of this {@code LocalDateTime} with the specified period in nanoseconds added.
1227      * <p>
1228      * This instance is immutable and unaffected by this method call.
1229      *
1230      * @param nanos  the nanos to add, may be negative
1231      * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null
1232      * @throws DateTimeException if the result exceeds the supported date range
1233      */
1234     public LocalDateTime plusNanos(long nanos) {
1235         return plusWithOverflow(date, 0, 0, 0, nanos, 1);
1236     }
1237 
1238     //-----------------------------------------------------------------------
1239     /**
1240      * Returns a copy of this date-time with the specified period subtracted.




1241      * <p>
1242      * This method returns a new date-time based on this time with the specified period subtracted.
1243      * The subtractor is typically {@link Period} but may be any other type implementing
1244      * the {@link TemporalSubtractor} interface.
1245      * The calculation is delegated to the specified adjuster, which typically calls
1246      * back to {@link #minus(long, TemporalUnit)}.
1247      * <p>
1248      * This instance is immutable and unaffected by this method call.
1249      *
1250      * @param subtractor  the subtractor to use, not null
1251      * @return a {@code LocalDateTime} based on this date-time with the subtraction made, not null
1252      * @throws DateTimeException if the subtraction cannot be made
1253      * @throws ArithmeticException if numeric overflow occurs
1254      */
1255     @Override
1256     public LocalDateTime minus(TemporalSubtractor subtractor) {
1257         return (LocalDateTime) subtractor.subtractFrom(this);
1258     }
1259 
1260     /**
1261      * Returns a copy of this date-time with the specified period subtracted.
1262      * <p>
1263      * This method returns a new date-time based on this date-time with the specified period subtracted.
1264      * This can be used to subtract any period that is defined by a unit, for example to subtract years, months or days.
1265      * The unit is responsible for the details of the calculation, including the resolution
1266      * of any edge cases in the calculation.


1267      * <p>
1268      * This instance is immutable and unaffected by this method call.
1269      *
1270      * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
1271      * @param unit  the unit of the period to subtract, not null
1272      * @return a {@code LocalDateTime} based on this date-time with the specified period subtracted, not null
1273      * @throws DateTimeException if the unit cannot be added to this type

1274      */
1275     @Override
1276     public LocalDateTime minus(long amountToSubtract, TemporalUnit unit) {
1277         return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1278     }
1279 
1280     //-----------------------------------------------------------------------
1281     /**
1282      * Returns a copy of this {@code LocalDateTime} with the specified period in years subtracted.
1283      * <p>
1284      * This method subtracts the specified amount from the years field in three steps:
1285      * <ol>
1286      * <li>Subtract the input years from the year field</li>
1287      * <li>Check if the resulting date would be invalid</li>
1288      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1289      * </ol>
1290      * <p>
1291      * For example, 2008-02-29 (leap year) minus one year would result in the
1292      * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1293      * result, the last valid day of the month, 2009-02-28, is selected instead.
1294      * <p>
1295      * This instance is immutable and unaffected by this method call.
1296      *
1297      * @param years  the years to subtract, may be negative
1298      * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null
1299      * @throws DateTimeException if the result exceeds the supported date range
1300      */
1301     public LocalDateTime minusYears(long years) {
1302         return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1303     }
1304 
1305     /**
1306      * Returns a copy of this {@code LocalDateTime} with the specified period in months subtracted.
1307      * <p>
1308      * This method subtracts the specified amount from the months field in three steps:
1309      * <ol>
1310      * <li>Subtract the input months from the month-of-year field</li>
1311      * <li>Check if the resulting date would be invalid</li>
1312      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1313      * </ol>
1314      * <p>
1315      * For example, 2007-03-31 minus one month would result in the invalid date
1316      * 2007-04-31. Instead of returning an invalid result, the last valid day
1317      * of the month, 2007-04-30, is selected instead.
1318      * <p>
1319      * This instance is immutable and unaffected by this method call.
1320      *
1321      * @param months  the months to subtract, may be negative
1322      * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null
1323      * @throws DateTimeException if the result exceeds the supported date range
1324      */
1325     public LocalDateTime minusMonths(long months) {
1326         return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1327     }
1328 
1329     /**
1330      * Returns a copy of this {@code LocalDateTime} with the specified period in weeks subtracted.
1331      * <p>
1332      * This method subtracts the specified amount in weeks from the days field decrementing
1333      * the month and year fields as necessary to ensure the result remains valid.
1334      * The result is only invalid if the maximum/minimum year is exceeded.
1335      * <p>
1336      * For example, 2009-01-07 minus one week would result in 2008-12-31.
1337      * <p>
1338      * This instance is immutable and unaffected by this method call.
1339      *
1340      * @param weeks  the weeks to subtract, may be negative
1341      * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
1342      * @throws DateTimeException if the result exceeds the supported date range
1343      */
1344     public LocalDateTime minusWeeks(long weeks) {
1345         return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1346     }
1347 
1348     /**
1349      * Returns a copy of this {@code LocalDateTime} with the specified period in days subtracted.
1350      * <p>
1351      * This method subtracts the specified amount from the days field incrementing the
1352      * month and year fields as necessary to ensure the result remains valid.
1353      * The result is only invalid if the maximum/minimum year is exceeded.
1354      * <p>
1355      * For example, 2009-01-01 minus one day would result in 2008-12-31.
1356      * <p>
1357      * This instance is immutable and unaffected by this method call.
1358      *
1359      * @param days  the days to subtract, may be negative
1360      * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null
1361      * @throws DateTimeException if the result exceeds the supported date range
1362      */
1363     public LocalDateTime minusDays(long days) {
1364         return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1365     }
1366 
1367     //-----------------------------------------------------------------------
1368     /**
1369      * Returns a copy of this {@code LocalDateTime} with the specified period in hours subtracted.
1370      * <p>
1371      * This instance is immutable and unaffected by this method call.
1372      *
1373      * @param hours  the hours to subtract, may be negative
1374      * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null
1375      * @throws DateTimeException if the result exceeds the supported date range
1376      */
1377     public LocalDateTime minusHours(long hours) {
1378         return plusWithOverflow(date, hours, 0, 0, 0, -1);
1379    }
1380 
1381     /**
1382      * Returns a copy of this {@code LocalDateTime} with the specified period in minutes subtracted.
1383      * <p>
1384      * This instance is immutable and unaffected by this method call.
1385      *
1386      * @param minutes  the minutes to subtract, may be negative
1387      * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null
1388      * @throws DateTimeException if the result exceeds the supported date range
1389      */
1390     public LocalDateTime minusMinutes(long minutes) {
1391         return plusWithOverflow(date, 0, minutes, 0, 0, -1);
1392     }
1393 
1394     /**
1395      * Returns a copy of this {@code LocalDateTime} with the specified period in seconds subtracted.
1396      * <p>
1397      * This instance is immutable and unaffected by this method call.
1398      *
1399      * @param seconds  the seconds to subtract, may be negative
1400      * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null
1401      * @throws DateTimeException if the result exceeds the supported date range
1402      */
1403     public LocalDateTime minusSeconds(long seconds) {
1404         return plusWithOverflow(date, 0, 0, seconds, 0, -1);
1405     }
1406 
1407     /**
1408      * Returns a copy of this {@code LocalDateTime} with the specified period in nanoseconds subtracted.
1409      * <p>
1410      * This instance is immutable and unaffected by this method call.
1411      *
1412      * @param nanos  the nanos to subtract, may be negative
1413      * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null
1414      * @throws DateTimeException if the result exceeds the supported date range
1415      */
1416     public LocalDateTime minusNanos(long nanos) {
1417         return plusWithOverflow(date, 0, 0, 0, nanos, -1);
1418     }
1419 
1420     //-----------------------------------------------------------------------
1421     /**
1422      * Returns a copy of this {@code LocalDateTime} with the specified period added.
1423      * <p>
1424      * This instance is immutable and unaffected by this method call.
1425      *
1426      * @param newDate  the new date to base the calculation on, not null
1427      * @param hours  the hours to add, may be negative
1428      * @param minutes the minutes to add, may be negative
1429      * @param seconds the seconds to add, may be negative
1430      * @param nanos the nanos to add, may be negative
1431      * @param sign  the sign to determine add or subtract
1432      * @return the combined result, not null
1433      */
1434     private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) {
1435         // 9223372036854775808 long, 2147483648 int
1436         if ((hours | minutes | seconds | nanos) == 0) {
1437             return with(newDate, time);
1438         }
1439         long totDays = nanos / NANOS_PER_DAY +             //   max/24*60*60*1B
1440                 seconds / SECONDS_PER_DAY +                //   max/24*60*60
1441                 minutes / MINUTES_PER_DAY +                //   max/24*60
1442                 hours / HOURS_PER_DAY;                     //   max/24
1443         totDays *= sign;                                   // total max*0.4237...
1444         long totNanos = nanos % NANOS_PER_DAY +                    //   max  86400000000000
1445                 (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND +   //   max  86400000000000
1446                 (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE +   //   max  86400000000000
1447                 (hours % HOURS_PER_DAY) * NANOS_PER_HOUR;          //   max  86400000000000
1448         long curNoD = time.toNanoOfDay();                       //   max  86400000000000
1449         totNanos = totNanos * sign + curNoD;                    // total 432000000000000
1450         totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);
1451         long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);
1452         LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));
1453         return with(newDate.plusDays(totDays), newTime);
1454     }
1455 
1456     //-----------------------------------------------------------------------
1457     /**
1458      * Queries this date-time using the specified query.
1459      * <p>
1460      * This queries this date-time using the specified query strategy object.
1461      * The {@code TemporalQuery} object defines the logic to be used to
1462      * obtain the result. Read the documentation of the query to understand
1463      * what the result of this method will be.
1464      * <p>
1465      * The result of this method is obtained by invoking the
1466      * {@link java.time.temporal.TemporalQuery#queryFrom(TemporalAccessor)} method on the
1467      * specified query passing {@code this} as the argument.
1468      *
1469      * @param <R> the type of the result
1470      * @param query  the query to invoke, not null
1471      * @return the query result, null may be returned (defined by the query)
1472      * @throws DateTimeException if unable to query (defined by the query)
1473      * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1474      */

1475     @Override  // override for Javadoc
1476     public <R> R query(TemporalQuery<R> query) {



1477         return ChronoLocalDateTime.super.query(query);
1478     }
1479 
1480     /**
1481      * Adjusts the specified temporal object to have the same date and time as this object.
1482      * <p>
1483      * This returns a temporal object of the same observable type as the input
1484      * with the date and time changed to be the same as this.
1485      * <p>
1486      * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1487      * twice, passing {@link ChronoField#EPOCH_DAY} and
1488      * {@link ChronoField#NANO_OF_DAY} as the fields.
1489      * <p>
1490      * In most cases, it is clearer to reverse the calling pattern by using
1491      * {@link Temporal#with(TemporalAdjuster)}:
1492      * <pre>
1493      *   // these two lines are equivalent, but the second approach is recommended
1494      *   temporal = thisLocalDateTime.adjustInto(temporal);
1495      *   temporal = temporal.with(thisLocalDateTime);
1496      * </pre>
1497      * <p>
1498      * This instance is immutable and unaffected by this method call.
1499      *
1500      * @param temporal  the target object to be adjusted, not null
1501      * @return the adjusted object, not null
1502      * @throws DateTimeException if unable to make the adjustment
1503      * @throws ArithmeticException if numeric overflow occurs
1504      */
1505     @Override  // override for Javadoc
1506     public Temporal adjustInto(Temporal temporal) {
1507         return ChronoLocalDateTime.super.adjustInto(temporal);
1508     }
1509 
1510     /**
1511      * Calculates the period between this date-time and another date-time in
1512      * terms of the specified unit.
1513      * <p>
1514      * This calculates the period between two date-times in terms of a single unit.
1515      * The start and end points are {@code this} and the specified date-time.
1516      * The result will be negative if the end is before the start.
1517      * The {@code Temporal} passed to this method must be a {@code LocalDateTime}.
1518      * For example, the period in days between two date-times can be calculated
1519      * using {@code startDateTime.periodUntil(endDateTime, DAYS)}.
1520      * <p>
1521      * The calculation returns a whole number, representing the number of
1522      * complete units between the two date-times.
1523      * For example, the period in months between 2012-06-15T00:00 and 2012-08-14T23:59
1524      * will only be one month as it is one minute short of two months.
1525      * <p>
1526      * This method operates in association with {@link TemporalUnit#between}.
1527      * The result of this method is a {@code long} representing the amount of
1528      * the specified unit. By contrast, the result of {@code between} is an
1529      * object that can be used directly in addition/subtraction:
1530      * <pre>
1531      *   long period = start.periodUntil(end, MONTHS);   // this method
1532      *   dateTime.plus(MONTHS.between(start, end));      // use in plus/minus

1533      * </pre>

1534      * <p>
1535      * The calculation is implemented in this method for {@link ChronoUnit}.
1536      * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1537      * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1538      * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1539      * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1540      * Other {@code ChronoUnit} values will throw an exception.
1541      * <p>
1542      * If the unit is not a {@code ChronoUnit}, then the result of this method
1543      * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1544      * passing {@code this} as the first argument and the input temporal as
1545      * the second argument.
1546      * <p>
1547      * This instance is immutable and unaffected by this method call.
1548      *
1549      * @param endDateTime  the end date-time, which must be a {@code LocalDateTime}, not null
1550      * @param unit  the unit to measure the period in, not null
1551      * @return the amount of the period between this date-time and the end date-time
1552      * @throws DateTimeException if the period cannot be calculated
1553      * @throws ArithmeticException if numeric overflow occurs
1554      */
1555     @Override
1556     public long periodUntil(Temporal endDateTime, TemporalUnit unit) {
1557         if (endDateTime instanceof LocalDateTime == false) {
1558             Objects.requireNonNull(endDateTime, "endDateTime");
1559             throw new DateTimeException("Unable to calculate period between objects of two different types");
1560         }
1561         LocalDateTime end = (LocalDateTime) endDateTime;
1562         if (unit instanceof ChronoUnit) {
1563             ChronoUnit f = (ChronoUnit) unit;
1564             if (f.isTimeUnit()) {
1565                 long amount = date.daysUntil(end.date);
1566                 switch (f) {
1567                     case NANOS: amount = Math.multiplyExact(amount, NANOS_PER_DAY); break;
1568                     case MICROS: amount = Math.multiplyExact(amount, MICROS_PER_DAY); break;
1569                     case MILLIS: amount = Math.multiplyExact(amount, MILLIS_PER_DAY); break;
1570                     case SECONDS: amount = Math.multiplyExact(amount, SECONDS_PER_DAY); break;
1571                     case MINUTES: amount = Math.multiplyExact(amount, MINUTES_PER_DAY); break;
1572                     case HOURS: amount = Math.multiplyExact(amount, HOURS_PER_DAY); break;
1573                     case HALF_DAYS: amount = Math.multiplyExact(amount, 2); break;
1574                 }
1575                 return Math.addExact(amount, time.periodUntil(end.time, unit));
1576             }
1577             LocalDate endDate = end.date;
1578             if (end.time.isBefore(time)) {
1579                 endDate = endDate.minusDays(1);
1580             }
1581             return date.periodUntil(endDate, unit);
1582         }
1583         return unit.between(this, endDateTime).getAmount();
1584     }
1585 
1586     //-----------------------------------------------------------------------
1587     /**
1588      * Returns an offset date-time formed from this date-time and the specified offset.
1589      * <p>
1590      * This combines this date-time with the specified offset to form an {@code OffsetDateTime}.
1591      * All possible combinations of date-time and offset are valid.
1592      * <p>
1593      * This instance is immutable and unaffected by this method call.
1594      *
1595      * @param offset  the offset to combine with, not null
1596      * @return the offset date-time formed from this date-time and the specified offset, not null
1597      */
1598     public OffsetDateTime atOffset(ZoneOffset offset) {
1599         return OffsetDateTime.of(this, offset);
1600     }
1601 
1602     /**
1603      * Returns a zoned date-time formed from this date-time and the specified time-zone.
1604      * <p>
1605      * This creates a zoned date-time matching the input date-time as closely as possible.

1606      * Time-zone rules, such as daylight savings, mean that not every local date-time
1607      * is valid for the specified zone, thus the local date-time may be adjusted.
1608      * <p>
1609      * The local date-time is resolved to a single instant on the time-line.
1610      * This is achieved by finding a valid offset from UTC/Greenwich for the local
1611      * date-time as defined by the {@link ZoneRules rules} of the zone ID.
1612      *<p>
1613      * In most cases, there is only one valid offset for a local date-time.
1614      * In the case of an overlap, where clocks are set back, there are two valid offsets.
1615      * This method uses the earlier offset typically corresponding to "summer".
1616      * <p>
1617      * In the case of a gap, where clocks jump forward, there is no valid offset.
1618      * Instead, the local date-time is adjusted to be later by the length of the gap.
1619      * For a typical one hour daylight savings change, the local date-time will be
1620      * moved one hour later into the offset typically corresponding to "summer".
1621      * <p>
1622      * To obtain the later offset during an overlap, call
1623      * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
1624      * To throw an exception when there is a gap or overlap, use
1625      * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}.
1626      * <p>
1627      * This instance is immutable and unaffected by this method call.
1628      *
1629      * @param zone  the time-zone to use, not null
1630      * @return the zoned date-time formed from this date-time, not null
1631      */
1632     @Override
1633     public ZonedDateTime atZone(ZoneId zone) {
1634         return ZonedDateTime.of(this, zone);
1635     }
1636 
1637     //-----------------------------------------------------------------------
1638     /**
1639      * Compares this date-time to another date-time.
1640      * <p>
1641      * The comparison is primarily based on the date-time, from earliest to latest.
1642      * It is "consistent with equals", as defined by {@link Comparable}.
1643      * <p>
1644      * If all the date-times being compared are instances of {@code LocalDateTime},
1645      * then the comparison will be entirely based on the date-time.
1646      * If some dates being compared are in different chronologies, then the
1647      * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}.
1648      *
1649      * @param other  the other date-time to compare to, not null
1650      * @return the comparator value, negative if less, positive if greater
1651      */
1652     @Override  // override for Javadoc and performance
1653     public int compareTo(ChronoLocalDateTime<?> other) {
1654         if (other instanceof LocalDateTime) {
1655             return compareTo0((LocalDateTime) other);
1656         }
1657         return ChronoLocalDateTime.super.compareTo(other);
1658     }
1659 
1660     private int compareTo0(LocalDateTime other) {
1661         int cmp = date.compareTo0(other.getDate());
1662         if (cmp == 0) {
1663             cmp = time.compareTo(other.getTime());
1664         }
1665         return cmp;
1666     }
1667 
1668     /**
1669      * Checks if this date-time is after the specified date-time.
1670      * <p>
1671      * This checks to see if this date-time represents a point on the
1672      * local time-line after the other date-time.
1673      * <pre>
1674      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1675      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1676      *   a.isAfter(b) == false
1677      *   a.isAfter(a) == false
1678      *   b.isAfter(a) == true
1679      * </pre>
1680      * <p>
1681      * This method only considers the position of the two date-times on the local time-line.
1682      * It does not take into account the chronology, or calendar system.
1683      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1684      * but is the same approach as {@link #DATE_TIME_COMPARATOR}.
1685      *
1686      * @param other  the other date-time to compare to, not null
1687      * @return true if this date-time is after the specified date-time
1688      */
1689     @Override  // override for Javadoc and performance
1690     public boolean isAfter(ChronoLocalDateTime<?> other) {
1691         if (other instanceof LocalDateTime) {
1692             return compareTo0((LocalDateTime) other) > 0;
1693         }
1694         return ChronoLocalDateTime.super.isAfter(other);
1695     }
1696 
1697     /**
1698      * Checks if this date-time is before the specified date-time.
1699      * <p>
1700      * This checks to see if this date-time represents a point on the
1701      * local time-line before the other date-time.
1702      * <pre>
1703      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1704      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1705      *   a.isBefore(b) == true
1706      *   a.isBefore(a) == false
1707      *   b.isBefore(a) == false
1708      * </pre>
1709      * <p>
1710      * This method only considers the position of the two date-times on the local time-line.
1711      * It does not take into account the chronology, or calendar system.
1712      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1713      * but is the same approach as {@link #DATE_TIME_COMPARATOR}.
1714      *
1715      * @param other  the other date-time to compare to, not null
1716      * @return true if this date-time is before the specified date-time
1717      */
1718     @Override  // override for Javadoc and performance
1719     public boolean isBefore(ChronoLocalDateTime<?> other) {
1720         if (other instanceof LocalDateTime) {
1721             return compareTo0((LocalDateTime) other) < 0;
1722         }
1723         return ChronoLocalDateTime.super.isBefore(other);
1724     }
1725 
1726     /**
1727      * Checks if this date-time is equal to the specified date-time.
1728      * <p>
1729      * This checks to see if this date-time represents the same point on the
1730      * local time-line as the other date-time.
1731      * <pre>
1732      *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
1733      *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
1734      *   a.isEqual(b) == false
1735      *   a.isEqual(a) == true
1736      *   b.isEqual(a) == false
1737      * </pre>
1738      * <p>
1739      * This method only considers the position of the two date-times on the local time-line.
1740      * It does not take into account the chronology, or calendar system.
1741      * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
1742      * but is the same approach as {@link #DATE_TIME_COMPARATOR}.
1743      *
1744      * @param other  the other date-time to compare to, not null
1745      * @return true if this date-time is equal to the specified date-time
1746      */
1747     @Override  // override for Javadoc and performance
1748     public boolean isEqual(ChronoLocalDateTime<?> other) {
1749         if (other instanceof LocalDateTime) {
1750             return compareTo0((LocalDateTime) other) == 0;
1751         }
1752         return ChronoLocalDateTime.super.isEqual(other);
1753     }
1754 
1755     //-----------------------------------------------------------------------
1756     /**
1757      * Checks if this date-time is equal to another date-time.
1758      * <p>
1759      * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same.
1760      * Only objects of type {@code LocalDateTime} are compared, other types return false.
1761      *
1762      * @param obj  the object to check, null returns false
1763      * @return true if this is equal to the other date-time
1764      */
1765     @Override
1766     public boolean equals(Object obj) {
1767         if (this == obj) {
1768             return true;
1769         }
1770         if (obj instanceof LocalDateTime) {
1771             LocalDateTime other = (LocalDateTime) obj;
1772             return date.equals(other.date) && time.equals(other.time);
1773         }
1774         return false;
1775     }
1776 
1777     /**
1778      * A hash code for this date-time.
1779      *
1780      * @return a suitable hash code
1781      */
1782     @Override
1783     public int hashCode() {
1784         return date.hashCode() ^ time.hashCode();
1785     }
1786 
1787     //-----------------------------------------------------------------------
1788     /**
1789      * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
1790      * <p>
1791      * The output will be one of the following ISO-8601 formats:
1792      * <p><ul>
1793      * <li>{@code yyyy-MM-dd'T'HH:mm}</li>
1794      * <li>{@code yyyy-MM-dd'T'HH:mm:ss}</li>
1795      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSS}</li>
1796      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSSSSS}</li>
1797      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
1798      * </ul><p>
1799      * The format used will be the shortest that outputs the full value of
1800      * the time where the omitted parts are implied to be zero.
1801      *
1802      * @return a string representation of this date-time, not null
1803      */
1804     @Override
1805     public String toString() {
1806         return date.toString() + 'T' + time.toString();
1807     }
1808 
1809     /**
1810      * Outputs this date-time as a {@code String} using the formatter.
1811      * <p>
1812      * This date-time will be passed to the formatter
1813      * {@link DateTimeFormatter#print(TemporalAccessor) print method}.
1814      *
1815      * @param formatter  the formatter to use, not null
1816      * @return the formatted date-time string, not null
1817      * @throws DateTimeException if an error occurs during printing
1818      */
1819     @Override  // override for Javadoc
1820     public String toString(DateTimeFormatter formatter) {
1821         return ChronoLocalDateTime.super.toString(formatter);
1822     }
1823 
1824     //-----------------------------------------------------------------------
1825     /**
1826      * Writes the object using a
1827      * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
1828      * <pre>
1829      *  out.writeByte(5);  // identifies this as a LocalDateTime
1830      *  // the <a href="../../serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
1831      *  // the <a href="../../serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
1832      * </pre>
1833      *
1834      * @return the instance of {@code Ser}, not null
1835      */
1836     private Object writeReplace() {
1837         return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this);
1838     }
1839 
1840     /**
1841      * Defend against malicious streams.
1842      * @return never
1843      * @throws InvalidObjectException always
1844      */
1845     private Object readResolve() throws ObjectStreamException {
1846         throw new InvalidObjectException("Deserialization via serialization delegate");
1847     }
1848 
1849     void writeExternal(DataOutput out) throws IOException {
1850         date.writeExternal(out);
1851         time.writeExternal(out);
1852     }
1853 
1854     static LocalDateTime readExternal(DataInput in) throws IOException {
1855         LocalDate date = LocalDate.readExternal(in);
1856         LocalTime time = LocalTime.readExternal(in);
1857         return LocalDateTime.of(date, time);
1858     }
1859 
1860 }
--- EOF ---