1 /*
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   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.temporal.ChronoField.EPOCH_DAY;
  65 import static java.time.temporal.ChronoField.INSTANT_SECONDS;
  66 import static java.time.temporal.ChronoField.NANO_OF_DAY;
  67 import static java.time.temporal.ChronoField.OFFSET_SECONDS;
  68 import static java.time.temporal.ChronoUnit.NANOS;
  69 
  70 import java.io.IOException;
  71 import java.io.InvalidObjectException;
  72 import java.io.ObjectInput;
  73 import java.io.ObjectOutput;
  74 import java.io.ObjectStreamException;
  75 import java.io.Serializable;
  76 import java.time.chrono.IsoChronology;
  77 import java.time.format.DateTimeFormatter;
  78 import java.time.format.DateTimeParseException;
  79 import java.time.temporal.ChronoField;
  80 import java.time.temporal.ChronoUnit;
  81 import java.time.temporal.Queries;
  82 import java.time.temporal.Temporal;
  83 import java.time.temporal.TemporalAccessor;
  84 import java.time.temporal.TemporalAdjuster;
  85 import java.time.temporal.TemporalAmount;
  86 import java.time.temporal.TemporalField;
  87 import java.time.temporal.TemporalQuery;
  88 import java.time.temporal.TemporalUnit;
  89 import java.time.temporal.ValueRange;
  90 import java.time.zone.ZoneRules;
  91 import java.util.Comparator;
  92 import java.util.Objects;
  93 
  94 /**
  95  * A date-time with an offset from UTC/Greenwich in the ISO-8601 calendar system,
  96  * such as {@code 2007-12-03T10:15:30+01:00}.
  97  * <p>
  98  * {@code OffsetDateTime} is an immutable representation of a date-time with an offset.
  99  * This class stores all date and time fields, to a precision of nanoseconds,
 100  * as well as the offset from UTC/Greenwich. For example, the value
 101  * "2nd October 2007 at 13:45.30.123456789 +02:00" can be stored in an {@code OffsetDateTime}.
 102  * <p>
 103  * {@code OffsetDateTime}, {@link java.time.ZonedDateTime} and {@link java.time.Instant} all store an instant
 104  * on the time-line to nanosecond precision.
 105  * {@code Instant} is the simplest, simply representing the instant.
 106  * {@code OffsetDateTime} adds to the instant the offset from UTC/Greenwich, which allows
 107  * the local date-time to be obtained.
 108  * {@code ZonedDateTime} adds full time-zone rules.
 109  * <p>
 110  * It is intended that {@code ZonedDateTime} or {@code Instant} is used to model data
 111  * in simpler applications. This class may be used when modeling date-time concepts in
 112  * more detail, or when communicating to a database or in a network protocol.
 113  *
 114  * <h3>Specification for implementors</h3>
 115  * This class is immutable and thread-safe.
 116  *
 117  * @since 1.8
 118  */
 119 public final class OffsetDateTime
 120         implements Temporal, TemporalAdjuster, Comparable<OffsetDateTime>, Serializable {
 121 
 122     /**
 123      * The minimum supported {@code OffsetDateTime}, '-999999999-01-01T00:00:00+18:00'.
 124      * This is the local date-time of midnight at the start of the minimum date
 125      * in the maximum offset (larger offsets are earlier on the time-line).
 126      * This combines {@link LocalDateTime#MIN} and {@link ZoneOffset#MAX}.
 127      * This could be used by an application as a "far past" date-time.
 128      */
 129     public static final OffsetDateTime MIN = LocalDateTime.MIN.atOffset(ZoneOffset.MAX);
 130     /**
 131      * The maximum supported {@code OffsetDateTime}, '+999999999-12-31T23:59:59.999999999-18:00'.
 132      * This is the local date-time just before midnight at the end of the maximum date
 133      * in the minimum offset (larger negative offsets are later on the time-line).
 134      * This combines {@link LocalDateTime#MAX} and {@link ZoneOffset#MIN}.
 135      * This could be used by an application as a "far future" date-time.
 136      */
 137     public static final OffsetDateTime MAX = LocalDateTime.MAX.atOffset(ZoneOffset.MIN);
 138 
 139     /**
 140      * Comparator for two {@code OffsetDateTime} instances based solely on the instant.
 141      * <p>
 142      * This method differs from the comparison in {@link #compareTo} in that it
 143      * only compares the underlying instant.
 144      *
 145      * @see #isAfter
 146      * @see #isBefore
 147      * @see #isEqual
 148      */
 149     public static final Comparator<OffsetDateTime> INSTANT_COMPARATOR = new Comparator<OffsetDateTime>() {
 150         @Override
 151         public int compare(OffsetDateTime datetime1, OffsetDateTime datetime2) {
 152             int cmp = Long.compare(datetime1.toEpochSecond(), datetime2.toEpochSecond());
 153             if (cmp == 0) {
 154                 cmp = Long.compare(datetime1.toLocalTime().toNanoOfDay(), datetime2.toLocalTime().toNanoOfDay());
 155             }
 156             return cmp;
 157         }
 158     };
 159 
 160     /**
 161      * Serialization version.
 162      */
 163     private static final long serialVersionUID = 2287754244819255394L;
 164 
 165     /**
 166      * The local date-time.
 167      */
 168     private final LocalDateTime dateTime;
 169     /**
 170      * The offset from UTC/Greenwich.
 171      */
 172     private final ZoneOffset offset;
 173 
 174     //-----------------------------------------------------------------------
 175     /**
 176      * Obtains the current date-time from the system clock in the default time-zone.
 177      * <p>
 178      * This will query the {@link java.time.Clock#systemDefaultZone() system clock} in the default
 179      * time-zone to obtain the current date-time.
 180      * The offset will be calculated from the time-zone in the clock.
 181      * <p>
 182      * Using this method will prevent the ability to use an alternate clock for testing
 183      * because the clock is hard-coded.
 184      *
 185      * @return the current date-time using the system clock, not null
 186      */
 187     public static OffsetDateTime now() {
 188         return now(Clock.systemDefaultZone());
 189     }
 190 
 191     /**
 192      * Obtains the current date-time from the system clock in the specified time-zone.
 193      * <p>
 194      * This will query the {@link Clock#system(java.time.ZoneId) system clock} to obtain the current date-time.
 195      * Specifying the time-zone avoids dependence on the default time-zone.
 196      * The offset will be calculated from the specified time-zone.
 197      * <p>
 198      * Using this method will prevent the ability to use an alternate clock for testing
 199      * because the clock is hard-coded.
 200      *
 201      * @param zone  the zone ID to use, not null
 202      * @return the current date-time using the system clock, not null
 203      */
 204     public static OffsetDateTime now(ZoneId zone) {
 205         return now(Clock.system(zone));
 206     }
 207 
 208     /**
 209      * Obtains the current date-time from the specified clock.
 210      * <p>
 211      * This will query the specified clock to obtain the current date-time.
 212      * The offset will be calculated from the time-zone in the clock.
 213      * <p>
 214      * Using this method allows the use of an alternate clock for testing.
 215      * The alternate clock may be introduced using {@link Clock dependency injection}.
 216      *
 217      * @param clock  the clock to use, not null
 218      * @return the current date-time, not null
 219      */
 220     public static OffsetDateTime now(Clock clock) {
 221         Objects.requireNonNull(clock, "clock");
 222         final Instant now = clock.instant();  // called once
 223         return ofInstant(now, clock.getZone().getRules().getOffset(now));
 224     }
 225 
 226     //-----------------------------------------------------------------------
 227     /**
 228      * Obtains an instance of {@code OffsetDateTime} from a date, time and offset.
 229      * <p>
 230      * This creates an offset date-time with the specified local date, time and offset.
 231      *
 232      * @param date  the local date, not null
 233      * @param time  the local time, not null
 234      * @param offset  the zone offset, not null
 235      * @return the offset date-time, not null
 236      */
 237     public static OffsetDateTime of(LocalDate date, LocalTime time, ZoneOffset offset) {
 238         LocalDateTime dt = LocalDateTime.of(date, time);
 239         return new OffsetDateTime(dt, offset);
 240     }
 241 
 242     /**
 243      * Obtains an instance of {@code OffsetDateTime} from a date-time and offset.
 244      * <p>
 245      * This creates an offset date-time with the specified local date-time and offset.
 246      *
 247      * @param dateTime  the local date-time, not null
 248      * @param offset  the zone offset, not null
 249      * @return the offset date-time, not null
 250      */
 251     public static OffsetDateTime of(LocalDateTime dateTime, ZoneOffset offset) {
 252         return new OffsetDateTime(dateTime, offset);
 253     }
 254 
 255     /**
 256      * Obtains an instance of {@code OffsetDateTime} from a year, month, day,
 257      * hour, minute, second, nanosecond and offset.
 258      * <p>
 259      * This creates an offset date-time with the seven specified fields.
 260      * <p>
 261      * This method exists primarily for writing test cases.
 262      * Non test-code will typically use other methods to create an offset time.
 263      * {@code LocalDateTime} has five additional convenience variants of the
 264      * equivalent factory method taking fewer arguments.
 265      * They are not provided here to reduce the footprint of the API.
 266      *
 267      * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
 268      * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
 269      * @param dayOfMonth  the day-of-month to represent, from 1 to 31
 270      * @param hour  the hour-of-day to represent, from 0 to 23
 271      * @param minute  the minute-of-hour to represent, from 0 to 59
 272      * @param second  the second-of-minute to represent, from 0 to 59
 273      * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
 274      * @param offset  the zone offset, not null
 275      * @return the offset date-time, not null
 276      * @throws DateTimeException if the value of any field is out of range, or
 277      *  if the day-of-month is invalid for the month-year
 278      */
 279     public static OffsetDateTime of(
 280             int year, int month, int dayOfMonth,
 281             int hour, int minute, int second, int nanoOfSecond, ZoneOffset offset) {
 282         LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
 283         return new OffsetDateTime(dt, offset);
 284     }
 285 
 286     //-----------------------------------------------------------------------
 287     /**
 288      * Obtains an instance of {@code OffsetDateTime} from an {@code Instant} and zone ID.
 289      * <p>
 290      * This creates an offset date-time with the same instant as that specified.
 291      * Finding the offset from UTC/Greenwich is simple as there is only one valid
 292      * offset for each instant.
 293      *
 294      * @param instant  the instant to create the date-time from, not null
 295      * @param zone  the time-zone, which may be an offset, not null
 296      * @return the offset date-time, not null
 297      * @throws DateTimeException if the result exceeds the supported range
 298      */
 299     public static OffsetDateTime ofInstant(Instant instant, ZoneId zone) {
 300         Objects.requireNonNull(instant, "instant");
 301         Objects.requireNonNull(zone, "zone");
 302         ZoneRules rules = zone.getRules();
 303         ZoneOffset offset = rules.getOffset(instant);
 304         LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
 305         return new OffsetDateTime(ldt, offset);
 306     }
 307 
 308     //-----------------------------------------------------------------------
 309     /**
 310      * Obtains an instance of {@code OffsetDateTime} from a temporal object.
 311      * <p>
 312      * This obtains an offset date-time based on the specified temporal.
 313      * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
 314      * which this factory converts to an instance of {@code OffsetDateTime}.
 315      * <p>
 316      * The conversion will first obtain a {@code ZoneOffset} from the temporal object.
 317      * It will then try to obtain a {@code LocalDateTime}, falling back to an {@code Instant} if necessary.
 318      * The result will be the combination of {@code ZoneOffset} with either
 319      * with {@code LocalDateTime} or {@code Instant}.
 320      * Implementations are permitted to perform optimizations such as accessing
 321      * those fields that are equivalent to the relevant objects.
 322      * <p>
 323      * This method matches the signature of the functional interface {@link TemporalQuery}
 324      * allowing it to be used in queries via method reference, {@code OffsetDateTime::from}.
 325      *
 326      * @param temporal  the temporal object to convert, not null
 327      * @return the offset date-time, not null
 328      * @throws DateTimeException if unable to convert to an {@code OffsetDateTime}
 329      */
 330     public static OffsetDateTime from(TemporalAccessor temporal) {
 331         if (temporal instanceof OffsetDateTime) {
 332             return (OffsetDateTime) temporal;
 333         }
 334         ZoneOffset offset = ZoneOffset.from(temporal);
 335         try {
 336             try {
 337                 LocalDateTime ldt = LocalDateTime.from(temporal);
 338                 return OffsetDateTime.of(ldt, offset);
 339             } catch (DateTimeException ignore) {
 340                 Instant instant = Instant.from(temporal);
 341                 return OffsetDateTime.ofInstant(instant, offset);
 342             }
 343         } catch (DateTimeException ex) {
 344             throw new DateTimeException("Unable to obtain OffsetDateTime from TemporalAccessor: " + temporal.getClass(), ex);
 345         }
 346     }
 347 
 348     //-----------------------------------------------------------------------
 349     /**
 350      * Obtains an instance of {@code OffsetDateTime} from a text string
 351      * such as {@code 2007-12-03T10:15:30+01:00}.
 352      * <p>
 353      * The string must represent a valid date-time and is parsed using
 354      * {@link java.time.format.DateTimeFormatter#ISO_OFFSET_DATE_TIME}.
 355      *
 356      * @param text  the text to parse such as "2007-12-03T10:15:30+01:00", not null
 357      * @return the parsed offset date-time, not null
 358      * @throws DateTimeParseException if the text cannot be parsed
 359      */
 360     public static OffsetDateTime parse(CharSequence text) {
 361         return parse(text, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
 362     }
 363 
 364     /**
 365      * Obtains an instance of {@code OffsetDateTime} from a text string using a specific formatter.
 366      * <p>
 367      * The text is parsed using the formatter, returning a date-time.
 368      *
 369      * @param text  the text to parse, not null
 370      * @param formatter  the formatter to use, not null
 371      * @return the parsed offset date-time, not null
 372      * @throws DateTimeParseException if the text cannot be parsed
 373      */
 374     public static OffsetDateTime parse(CharSequence text, DateTimeFormatter formatter) {
 375         Objects.requireNonNull(formatter, "formatter");
 376         return formatter.parse(text, OffsetDateTime::from);
 377     }
 378 
 379     //-----------------------------------------------------------------------
 380     /**
 381      * Constructor.
 382      *
 383      * @param dateTime  the local date-time, not null
 384      * @param offset  the zone offset, not null
 385      */
 386     private OffsetDateTime(LocalDateTime dateTime, ZoneOffset offset) {
 387         this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
 388         this.offset = Objects.requireNonNull(offset, "offset");
 389     }
 390 
 391     /**
 392      * Returns a new date-time based on this one, returning {@code this} where possible.
 393      *
 394      * @param dateTime  the date-time to create with, not null
 395      * @param offset  the zone offset to create with, not null
 396      */
 397     private OffsetDateTime with(LocalDateTime dateTime, ZoneOffset offset) {
 398         if (this.dateTime == dateTime && this.offset.equals(offset)) {
 399             return this;
 400         }
 401         return new OffsetDateTime(dateTime, offset);
 402     }
 403 
 404     //-----------------------------------------------------------------------
 405     /**
 406      * Checks if the specified field is supported.
 407      * <p>
 408      * This checks if this date-time can be queried for the specified field.
 409      * If false, then calling the {@link #range(TemporalField) range} and
 410      * {@link #get(TemporalField) get} methods will throw an exception.
 411      * <p>
 412      * If the field is a {@link ChronoField} then the query is implemented here.
 413      * The supported fields are:
 414      * <ul>
 415      * <li>{@code NANO_OF_SECOND}
 416      * <li>{@code NANO_OF_DAY}
 417      * <li>{@code MICRO_OF_SECOND}
 418      * <li>{@code MICRO_OF_DAY}
 419      * <li>{@code MILLI_OF_SECOND}
 420      * <li>{@code MILLI_OF_DAY}
 421      * <li>{@code SECOND_OF_MINUTE}
 422      * <li>{@code SECOND_OF_DAY}
 423      * <li>{@code MINUTE_OF_HOUR}
 424      * <li>{@code MINUTE_OF_DAY}
 425      * <li>{@code HOUR_OF_AMPM}
 426      * <li>{@code CLOCK_HOUR_OF_AMPM}
 427      * <li>{@code HOUR_OF_DAY}
 428      * <li>{@code CLOCK_HOUR_OF_DAY}
 429      * <li>{@code AMPM_OF_DAY}
 430      * <li>{@code DAY_OF_WEEK}
 431      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
 432      * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
 433      * <li>{@code DAY_OF_MONTH}
 434      * <li>{@code DAY_OF_YEAR}
 435      * <li>{@code EPOCH_DAY}
 436      * <li>{@code ALIGNED_WEEK_OF_MONTH}
 437      * <li>{@code ALIGNED_WEEK_OF_YEAR}
 438      * <li>{@code MONTH_OF_YEAR}
 439      * <li>{@code EPOCH_MONTH}
 440      * <li>{@code YEAR_OF_ERA}
 441      * <li>{@code YEAR}
 442      * <li>{@code ERA}
 443      * <li>{@code INSTANT_SECONDS}
 444      * <li>{@code OFFSET_SECONDS}
 445      * </ul>
 446      * All other {@code ChronoField} instances will return false.
 447      * <p>
 448      * If the field is not a {@code ChronoField}, then the result of this method
 449      * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
 450      * passing {@code this} as the argument.
 451      * Whether the field is supported is determined by the field.
 452      *
 453      * @param field  the field to check, null returns false
 454      * @return true if the field is supported on this date-time, false if not
 455      */
 456     @Override
 457     public boolean isSupported(TemporalField field) {
 458         return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
 459     }
 460 
 461     /**
 462      * Gets the range of valid values for the specified field.
 463      * <p>
 464      * The range object expresses the minimum and maximum valid values for a field.
 465      * This date-time is used to enhance the accuracy of the returned range.
 466      * If it is not possible to return the range, because the field is not supported
 467      * or for some other reason, an exception is thrown.
 468      * <p>
 469      * If the field is a {@link ChronoField} then the query is implemented here.
 470      * The {@link #isSupported(TemporalField) supported fields} will return
 471      * appropriate range instances.
 472      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 473      * <p>
 474      * If the field is not a {@code ChronoField}, then the result of this method
 475      * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
 476      * passing {@code this} as the argument.
 477      * Whether the range can be obtained is determined by the field.
 478      *
 479      * @param field  the field to query the range for, not null
 480      * @return the range of valid values for the field, not null
 481      * @throws DateTimeException if the range for the field cannot be obtained
 482      */
 483     @Override
 484     public ValueRange range(TemporalField field) {
 485         if (field instanceof ChronoField) {
 486             if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
 487                 return field.range();
 488             }
 489             return dateTime.range(field);
 490         }
 491         return field.rangeRefinedBy(this);
 492     }
 493 
 494     /**
 495      * Gets the value of the specified field from this date-time as an {@code int}.
 496      * <p>
 497      * This queries this date-time for the value for the specified field.
 498      * The returned value will always be within the valid range of values for the field.
 499      * If it is not possible to return the value, because the field is not supported
 500      * or for some other reason, an exception is thrown.
 501      * <p>
 502      * If the field is a {@link ChronoField} then the query is implemented here.
 503      * The {@link #isSupported(TemporalField) supported fields} will return valid
 504      * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
 505      * {@code EPOCH_DAY}, {@code EPOCH_MONTH} and {@code INSTANT_SECONDS} which are too
 506      * large to fit in an {@code int} and throw a {@code DateTimeException}.
 507      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 508      * <p>
 509      * If the field is not a {@code ChronoField}, then the result of this method
 510      * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
 511      * passing {@code this} as the argument. Whether the value can be obtained,
 512      * and what the value represents, is determined by the field.
 513      *
 514      * @param field  the field to get, not null
 515      * @return the value for the field
 516      * @throws DateTimeException if a value for the field cannot be obtained
 517      * @throws ArithmeticException if numeric overflow occurs
 518      */
 519     @Override
 520     public int get(TemporalField field) {
 521         if (field instanceof ChronoField) {
 522             switch ((ChronoField) field) {
 523                 case INSTANT_SECONDS: throw new DateTimeException("Field too large for an int: " + field);
 524                 case OFFSET_SECONDS: return getOffset().getTotalSeconds();
 525             }
 526             return dateTime.get(field);
 527         }
 528         return Temporal.super.get(field);
 529     }
 530 
 531     /**
 532      * Gets the value of the specified field from this date-time as a {@code long}.
 533      * <p>
 534      * This queries this date-time for the value for the specified field.
 535      * If it is not possible to return the value, because the field is not supported
 536      * or for some other reason, an exception is thrown.
 537      * <p>
 538      * If the field is a {@link ChronoField} then the query is implemented here.
 539      * The {@link #isSupported(TemporalField) supported fields} will return valid
 540      * values based on this date-time.
 541      * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
 542      * <p>
 543      * If the field is not a {@code ChronoField}, then the result of this method
 544      * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
 545      * passing {@code this} as the argument. Whether the value can be obtained,
 546      * and what the value represents, is determined by the field.
 547      *
 548      * @param field  the field to get, not null
 549      * @return the value for the field
 550      * @throws DateTimeException if a value for the field cannot be obtained
 551      * @throws ArithmeticException if numeric overflow occurs
 552      */
 553     @Override
 554     public long getLong(TemporalField field) {
 555         if (field instanceof ChronoField) {
 556             switch ((ChronoField) field) {
 557                 case INSTANT_SECONDS: return toEpochSecond();
 558                 case OFFSET_SECONDS: return getOffset().getTotalSeconds();
 559             }
 560             return dateTime.getLong(field);
 561         }
 562         return field.getFrom(this);
 563     }
 564 
 565     //-----------------------------------------------------------------------
 566     /**
 567      * Gets the zone offset, such as '+01:00'.
 568      * <p>
 569      * This is the offset of the local date-time from UTC/Greenwich.
 570      *
 571      * @return the zone offset, not null
 572      */
 573     public ZoneOffset getOffset() {
 574         return offset;
 575     }
 576 
 577     /**
 578      * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
 579      * that the result has the same local date-time.
 580      * <p>
 581      * This method returns an object with the same {@code LocalDateTime} and the specified {@code ZoneOffset}.
 582      * No calculation is needed or performed.
 583      * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
 584      * {@code +03:00}, then this method will return {@code 2007-12-03T10:30+03:00}.
 585      * <p>
 586      * To take into account the difference between the offsets, and adjust the time fields,
 587      * use {@link #withOffsetSameInstant}.
 588      * <p>
 589      * This instance is immutable and unaffected by this method call.
 590      *
 591      * @param offset  the zone offset to change to, not null
 592      * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
 593      */
 594     public OffsetDateTime withOffsetSameLocal(ZoneOffset offset) {
 595         return with(dateTime, offset);
 596     }
 597 
 598     /**
 599      * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
 600      * that the result is at the same instant.
 601      * <p>
 602      * This method returns an object with the specified {@code ZoneOffset} and a {@code LocalDateTime}
 603      * adjusted by the difference between the two offsets.
 604      * This will result in the old and new objects representing the same instant.
 605      * This is useful for finding the local time in a different offset.
 606      * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
 607      * {@code +03:00}, then this method will return {@code 2007-12-03T11:30+03:00}.
 608      * <p>
 609      * To change the offset without adjusting the local time use {@link #withOffsetSameLocal}.
 610      * <p>
 611      * This instance is immutable and unaffected by this method call.
 612      *
 613      * @param offset  the zone offset to change to, not null
 614      * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
 615      * @throws DateTimeException if the result exceeds the supported date range
 616      */
 617     public OffsetDateTime withOffsetSameInstant(ZoneOffset offset) {
 618         if (offset.equals(this.offset)) {
 619             return this;
 620         }
 621         int difference = offset.getTotalSeconds() - this.offset.getTotalSeconds();
 622         LocalDateTime adjusted = dateTime.plusSeconds(difference);
 623         return new OffsetDateTime(adjusted, offset);
 624     }
 625 
 626     //-----------------------------------------------------------------------
 627     /**
 628      * Gets the {@code LocalDateTime} part of this offset date-time.
 629      * <p>
 630      * This returns a {@code LocalDateTime} with the same year, month, day and time
 631      * as this date-time.
 632      *
 633      * @return the local date-time part of this date-time, not null
 634      */
 635     public LocalDateTime toLocalDateTime() {
 636         return dateTime;
 637     }
 638 
 639     //-----------------------------------------------------------------------
 640     /**
 641      * Gets the {@code LocalDate} part of this date-time.
 642      * <p>
 643      * This returns a {@code LocalDate} with the same year, month and day
 644      * as this date-time.
 645      *
 646      * @return the date part of this date-time, not null
 647      */
 648     public LocalDate toLocalDate() {
 649         return dateTime.toLocalDate();
 650     }
 651 
 652     /**
 653      * Gets the year field.
 654      * <p>
 655      * This method returns the primitive {@code int} value for the year.
 656      * <p>
 657      * The year returned by this method is proleptic as per {@code get(YEAR)}.
 658      * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
 659      *
 660      * @return the year, from MIN_YEAR to MAX_YEAR
 661      */
 662     public int getYear() {
 663         return dateTime.getYear();
 664     }
 665 
 666     /**
 667      * Gets the month-of-year field from 1 to 12.
 668      * <p>
 669      * This method returns the month as an {@code int} from 1 to 12.
 670      * Application code is frequently clearer if the enum {@link Month}
 671      * is used by calling {@link #getMonth()}.
 672      *
 673      * @return the month-of-year, from 1 to 12
 674      * @see #getMonth()
 675      */
 676     public int getMonthValue() {
 677         return dateTime.getMonthValue();
 678     }
 679 
 680     /**
 681      * Gets the month-of-year field using the {@code Month} enum.
 682      * <p>
 683      * This method returns the enum {@link Month} for the month.
 684      * This avoids confusion as to what {@code int} values mean.
 685      * If you need access to the primitive {@code int} value then the enum
 686      * provides the {@link Month#getValue() int value}.
 687      *
 688      * @return the month-of-year, not null
 689      * @see #getMonthValue()
 690      */
 691     public Month getMonth() {
 692         return dateTime.getMonth();
 693     }
 694 
 695     /**
 696      * Gets the day-of-month field.
 697      * <p>
 698      * This method returns the primitive {@code int} value for the day-of-month.
 699      *
 700      * @return the day-of-month, from 1 to 31
 701      */
 702     public int getDayOfMonth() {
 703         return dateTime.getDayOfMonth();
 704     }
 705 
 706     /**
 707      * Gets the day-of-year field.
 708      * <p>
 709      * This method returns the primitive {@code int} value for the day-of-year.
 710      *
 711      * @return the day-of-year, from 1 to 365, or 366 in a leap year
 712      */
 713     public int getDayOfYear() {
 714         return dateTime.getDayOfYear();
 715     }
 716 
 717     /**
 718      * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
 719      * <p>
 720      * This method returns the enum {@link java.time.DayOfWeek} for the day-of-week.
 721      * This avoids confusion as to what {@code int} values mean.
 722      * If you need access to the primitive {@code int} value then the enum
 723      * provides the {@link java.time.DayOfWeek#getValue() int value}.
 724      * <p>
 725      * Additional information can be obtained from the {@code DayOfWeek}.
 726      * This includes textual names of the values.
 727      *
 728      * @return the day-of-week, not null
 729      */
 730     public DayOfWeek getDayOfWeek() {
 731         return dateTime.getDayOfWeek();
 732     }
 733 
 734     //-----------------------------------------------------------------------
 735     /**
 736      * Gets the {@code LocalTime} part of this date-time.
 737      * <p>
 738      * This returns a {@code LocalTime} with the same hour, minute, second and
 739      * nanosecond as this date-time.
 740      *
 741      * @return the time part of this date-time, not null
 742      */
 743     public LocalTime toLocalTime() {
 744         return dateTime.toLocalTime();
 745     }
 746 
 747     /**
 748      * Gets the hour-of-day field.
 749      *
 750      * @return the hour-of-day, from 0 to 23
 751      */
 752     public int getHour() {
 753         return dateTime.getHour();
 754     }
 755 
 756     /**
 757      * Gets the minute-of-hour field.
 758      *
 759      * @return the minute-of-hour, from 0 to 59
 760      */
 761     public int getMinute() {
 762         return dateTime.getMinute();
 763     }
 764 
 765     /**
 766      * Gets the second-of-minute field.
 767      *
 768      * @return the second-of-minute, from 0 to 59
 769      */
 770     public int getSecond() {
 771         return dateTime.getSecond();
 772     }
 773 
 774     /**
 775      * Gets the nano-of-second field.
 776      *
 777      * @return the nano-of-second, from 0 to 999,999,999
 778      */
 779     public int getNano() {
 780         return dateTime.getNano();
 781     }
 782 
 783     //-----------------------------------------------------------------------
 784     /**
 785      * Returns an adjusted copy of this date-time.
 786      * <p>
 787      * This returns an {@code OffsetDateTime}, based on this one, with the date-time adjusted.
 788      * The adjustment takes place using the specified adjuster strategy object.
 789      * Read the documentation of the adjuster to understand what adjustment will be made.
 790      * <p>
 791      * A simple adjuster might simply set the one of the fields, such as the year field.
 792      * A more complex adjuster might set the date to the last day of the month.
 793      * A selection of common adjustments is provided in {@link java.time.temporal.Adjusters}.
 794      * These include finding the "last day of the month" and "next Wednesday".
 795      * Key date-time classes also implement the {@code TemporalAdjuster} interface,
 796      * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
 797      * The adjuster is responsible for handling special cases, such as the varying
 798      * lengths of month and leap years.
 799      * <p>
 800      * For example this code returns a date on the last day of July:
 801      * <pre>
 802      *  import static java.time.Month.*;
 803      *  import static java.time.temporal.Adjusters.*;
 804      *
 805      *  result = offsetDateTime.with(JULY).with(lastDayOfMonth());
 806      * </pre>
 807      * <p>
 808      * The classes {@link LocalDate}, {@link LocalTime} and {@link ZoneOffset} implement
 809      * {@code TemporalAdjuster}, thus this method can be used to change the date, time or offset:
 810      * <pre>
 811      *  result = offsetDateTime.with(date);
 812      *  result = offsetDateTime.with(time);
 813      *  result = offsetDateTime.with(offset);
 814      * </pre>
 815      * <p>
 816      * The result of this method is obtained by invoking the
 817      * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
 818      * specified adjuster passing {@code this} as the argument.
 819      * <p>
 820      * This instance is immutable and unaffected by this method call.
 821      *
 822      * @param adjuster the adjuster to use, not null
 823      * @return an {@code OffsetDateTime} based on {@code this} with the adjustment made, not null
 824      * @throws DateTimeException if the adjustment cannot be made
 825      * @throws ArithmeticException if numeric overflow occurs
 826      */
 827     @Override
 828     public OffsetDateTime with(TemporalAdjuster adjuster) {
 829         // optimizations
 830         if (adjuster instanceof LocalDate || adjuster instanceof LocalTime || adjuster instanceof LocalDateTime) {
 831             return with(dateTime.with(adjuster), offset);
 832         } else if (adjuster instanceof Instant) {
 833             return ofInstant((Instant) adjuster, offset);
 834         } else if (adjuster instanceof ZoneOffset) {
 835             return with(dateTime, (ZoneOffset) adjuster);
 836         } else if (adjuster instanceof OffsetDateTime) {
 837             return (OffsetDateTime) adjuster;
 838         }
 839         return (OffsetDateTime) adjuster.adjustInto(this);
 840     }
 841 
 842     /**
 843      * Returns a copy of this date-time with the specified field set to a new value.
 844      * <p>
 845      * TThis returns an {@code OffsetDateTime}, based on this one, with the value
 846      * for the specified field changed.
 847      * This can be used to change any supported field, such as the year, month or day-of-month.
 848      * If it is not possible to set the value, because the field is not supported or for
 849      * some other reason, an exception is thrown.
 850      * <p>
 851      * In some cases, changing the specified field can cause the resulting date-time to become invalid,
 852      * such as changing the month from 31st January to February would make the day-of-month invalid.
 853      * In cases like this, the field is responsible for resolving the date. Typically it will choose
 854      * the previous valid date, which would be the last valid day of February in this example.
 855      * <p>
 856      * If the field is a {@link ChronoField} then the adjustment is implemented here.
 857      * <p>
 858      * The {@code INSTANT_SECONDS} field will return a date-time with the specified instant.
 859      * The offset and nano-of-second are unchanged.
 860      * If the new instant value is outside the valid range then a {@code DateTimeException} will be thrown.
 861      * <p>
 862      * The {@code OFFSET_SECONDS} field will return a date-time with the specified offset.
 863      * The local date-time is unaltered. If the new offset value is outside the valid range
 864      * then a {@code DateTimeException} will be thrown.
 865      * <p>
 866      * The other {@link #isSupported(TemporalField) supported fields} will behave as per
 867      * the matching method on {@link LocalDateTime#with(TemporalField, long) LocalDateTime}.
 868      * In this case, the offset is not part of the calculation and will be unchanged.
 869      * <p>
 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.adjustInto(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 an {@code OffsetDateTime} 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 OffsetDateTime with(TemporalField field, long newValue) {
 887         if (field instanceof ChronoField) {
 888             ChronoField f = (ChronoField) field;
 889             switch (f) {
 890                 case INSTANT_SECONDS: return ofInstant(Instant.ofEpochSecond(newValue, getNano()), offset);
 891                 case OFFSET_SECONDS: {
 892                     return with(dateTime, ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue)));
 893                 }
 894             }
 895             return with(dateTime.with(field, newValue), offset);
 896         }
 897         return field.adjustInto(this, newValue);
 898     }
 899 
 900     //-----------------------------------------------------------------------
 901     /**
 902      * Returns a copy of this {@code OffsetDateTime} with the year altered.
 903      * The offset does not affect the calculation and will be the same in the result.
 904      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 905      * <p>
 906      * This instance is immutable and unaffected by this method call.
 907      *
 908      * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
 909      * @return an {@code OffsetDateTime} based on this date-time with the requested year, not null
 910      * @throws DateTimeException if the year value is invalid
 911      */
 912     public OffsetDateTime withYear(int year) {
 913         return with(dateTime.withYear(year), offset);
 914     }
 915 
 916     /**
 917      * Returns a copy of this {@code OffsetDateTime} with the month-of-year altered.
 918      * The offset does not affect the calculation and will be the same in the result.
 919      * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
 920      * <p>
 921      * This instance is immutable and unaffected by this method call.
 922      *
 923      * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
 924      * @return an {@code OffsetDateTime} based on this date-time with the requested month, not null
 925      * @throws DateTimeException if the month-of-year value is invalid
 926      */
 927     public OffsetDateTime withMonth(int month) {
 928         return with(dateTime.withMonth(month), offset);
 929     }
 930 
 931     /**
 932      * Returns a copy of this {@code OffsetDateTime} with the day-of-month altered.
 933      * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
 934      * The offset does not affect the calculation and will be the same in the result.
 935      * <p>
 936      * This instance is immutable and unaffected by this method call.
 937      *
 938      * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
 939      * @return an {@code OffsetDateTime} based on this date-time with the requested day, not null
 940      * @throws DateTimeException if the day-of-month value is invalid,
 941      *  or if the day-of-month is invalid for the month-year
 942      */
 943     public OffsetDateTime withDayOfMonth(int dayOfMonth) {
 944         return with(dateTime.withDayOfMonth(dayOfMonth), offset);
 945     }
 946 
 947     /**
 948      * Returns a copy of this {@code OffsetDateTime} with the day-of-year altered.
 949      * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
 950      * <p>
 951      * This instance is immutable and unaffected by this method call.
 952      *
 953      * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
 954      * @return an {@code OffsetDateTime} based on this date with the requested day, not null
 955      * @throws DateTimeException if the day-of-year value is invalid,
 956      *  or if the day-of-year is invalid for the year
 957      */
 958     public OffsetDateTime withDayOfYear(int dayOfYear) {
 959         return with(dateTime.withDayOfYear(dayOfYear), offset);
 960     }
 961 
 962     //-----------------------------------------------------------------------
 963     /**
 964      * Returns a copy of this {@code OffsetDateTime} with the hour-of-day value altered.
 965      * <p>
 966      * The offset does not affect the calculation and will be the same in the result.
 967      * <p>
 968      * This instance is immutable and unaffected by this method call.
 969      *
 970      * @param hour  the hour-of-day to set in the result, from 0 to 23
 971      * @return an {@code OffsetDateTime} based on this date-time with the requested hour, not null
 972      * @throws DateTimeException if the hour value is invalid
 973      */
 974     public OffsetDateTime withHour(int hour) {
 975         return with(dateTime.withHour(hour), offset);
 976     }
 977 
 978     /**
 979      * Returns a copy of this {@code OffsetDateTime} with the minute-of-hour value altered.
 980      * <p>
 981      * The offset does not affect the calculation and will be the same in the result.
 982      * <p>
 983      * This instance is immutable and unaffected by this method call.
 984      *
 985      * @param minute  the minute-of-hour to set in the result, from 0 to 59
 986      * @return an {@code OffsetDateTime} based on this date-time with the requested minute, not null
 987      * @throws DateTimeException if the minute value is invalid
 988      */
 989     public OffsetDateTime withMinute(int minute) {
 990         return with(dateTime.withMinute(minute), offset);
 991     }
 992 
 993     /**
 994      * Returns a copy of this {@code OffsetDateTime} with the second-of-minute value altered.
 995      * <p>
 996      * The offset does not affect the calculation and will be the same in the result.
 997      * <p>
 998      * This instance is immutable and unaffected by this method call.
 999      *
1000      * @param second  the second-of-minute to set in the result, from 0 to 59
1001      * @return an {@code OffsetDateTime} based on this date-time with the requested second, not null
1002      * @throws DateTimeException if the second value is invalid
1003      */
1004     public OffsetDateTime withSecond(int second) {
1005         return with(dateTime.withSecond(second), offset);
1006     }
1007 
1008     /**
1009      * Returns a copy of this {@code OffsetDateTime} with the nano-of-second value altered.
1010      * <p>
1011      * The offset does not affect the calculation and will be the same in the result.
1012      * <p>
1013      * This instance is immutable and unaffected by this method call.
1014      *
1015      * @param nanoOfSecond  the nano-of-second to set in the result, from 0 to 999,999,999
1016      * @return an {@code OffsetDateTime} based on this date-time with the requested nanosecond, not null
1017      * @throws DateTimeException if the nanos value is invalid
1018      */
1019     public OffsetDateTime withNano(int nanoOfSecond) {
1020         return with(dateTime.withNano(nanoOfSecond), offset);
1021     }
1022 
1023     //-----------------------------------------------------------------------
1024     /**
1025      * Returns a copy of this {@code OffsetDateTime} with the time truncated.
1026      * <p>
1027      * Truncation returns a copy of the original date-time with fields
1028      * smaller than the specified unit set to zero.
1029      * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
1030      * will set the second-of-minute and nano-of-second field to zero.
1031      * <p>
1032      * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
1033      * that divides into the length of a standard day without remainder.
1034      * This includes all supplied time units on {@link ChronoUnit} and
1035      * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
1036      * <p>
1037      * The offset does not affect the calculation and will be the same in the result.
1038      * <p>
1039      * This instance is immutable and unaffected by this method call.
1040      *
1041      * @param unit  the unit to truncate to, not null
1042      * @return an {@code OffsetDateTime} based on this date-time with the time truncated, not null
1043      * @throws DateTimeException if unable to truncate
1044      */
1045     public OffsetDateTime truncatedTo(TemporalUnit unit) {
1046         return with(dateTime.truncatedTo(unit), offset);
1047     }
1048 
1049     //-----------------------------------------------------------------------
1050     /**
1051      * Returns a copy of this date-time with the specified amount added.
1052      * <p>
1053      * This returns an {@code OffsetDateTime}, based on this one, with the specified amount added.
1054      * The amount is typically {@link Period} or {@link Duration} but may be
1055      * any other type implementing the {@link TemporalAmount} interface.
1056      * <p>
1057      * The calculation is delegated to the amount object by calling
1058      * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
1059      * to implement the addition in any way it wishes, however it typically
1060      * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
1061      * of the amount implementation to determine if it can be successfully added.
1062      * <p>
1063      * This instance is immutable and unaffected by this method call.
1064      *
1065      * @param amountToAdd  the amount to add, not null
1066      * @return an {@code OffsetDateTime} based on this date-time with the addition made, not null
1067      * @throws DateTimeException if the addition cannot be made
1068      * @throws ArithmeticException if numeric overflow occurs
1069      */
1070     @Override
1071     public OffsetDateTime plus(TemporalAmount amountToAdd) {
1072         return (OffsetDateTime) amountToAdd.addTo(this);
1073     }
1074 
1075     /**
1076      * Returns a copy of this date-time with the specified amount added.
1077      * <p>
1078      * This returns an {@code OffsetDateTime}, based on this one, with the amount
1079      * in terms of the unit added. If it is not possible to add the amount, because the
1080      * unit is not supported or for some other reason, an exception is thrown.
1081      * <p>
1082      * If the field is a {@link ChronoUnit} then the addition is implemented by
1083      * {@link LocalDateTime#plus(long, TemporalUnit)}.
1084      * The offset is not part of the calculation and will be unchanged in the result.
1085      * <p>
1086      * If the field is not a {@code ChronoUnit}, then the result of this method
1087      * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
1088      * passing {@code this} as the argument. In this case, the unit determines
1089      * whether and how to perform the addition.
1090      * <p>
1091      * This instance is immutable and unaffected by this method call.
1092      *
1093      * @param amountToAdd  the amount of the unit to add to the result, may be negative
1094      * @param unit  the unit of the amount to add, not null
1095      * @return an {@code OffsetDateTime} based on this date-time with the specified amount added, not null
1096      * @throws DateTimeException if the addition cannot be made
1097      * @throws ArithmeticException if numeric overflow occurs
1098      */
1099     @Override
1100     public OffsetDateTime plus(long amountToAdd, TemporalUnit unit) {
1101         if (unit instanceof ChronoUnit) {
1102             return with(dateTime.plus(amountToAdd, unit), offset);
1103         }
1104         return unit.addTo(this, amountToAdd);
1105     }
1106 
1107     //-----------------------------------------------------------------------
1108     /**
1109      * Returns a copy of this {@code OffsetDateTime} with the specified period in years added.
1110      * <p>
1111      * This method adds the specified amount to the years field in three steps:
1112      * <ol>
1113      * <li>Add the input years to the year field</li>
1114      * <li>Check if the resulting date would be invalid</li>
1115      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1116      * </ol>
1117      * <p>
1118      * For example, 2008-02-29 (leap year) plus one year would result in the
1119      * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1120      * result, the last valid day of the month, 2009-02-28, is selected instead.
1121      * <p>
1122      * This instance is immutable and unaffected by this method call.
1123      *
1124      * @param years  the years to add, may be negative
1125      * @return an {@code OffsetDateTime} based on this date-time with the years added, not null
1126      * @throws DateTimeException if the result exceeds the supported date range
1127      */
1128     public OffsetDateTime plusYears(long years) {
1129         return with(dateTime.plusYears(years), offset);
1130     }
1131 
1132     /**
1133      * Returns a copy of this {@code OffsetDateTime} with the specified period in months added.
1134      * <p>
1135      * This method adds the specified amount to the months field in three steps:
1136      * <ol>
1137      * <li>Add the input months to the month-of-year field</li>
1138      * <li>Check if the resulting date would be invalid</li>
1139      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1140      * </ol>
1141      * <p>
1142      * For example, 2007-03-31 plus one month would result in the invalid date
1143      * 2007-04-31. Instead of returning an invalid result, the last valid day
1144      * of the month, 2007-04-30, is selected instead.
1145      * <p>
1146      * This instance is immutable and unaffected by this method call.
1147      *
1148      * @param months  the months to add, may be negative
1149      * @return an {@code OffsetDateTime} based on this date-time with the months added, not null
1150      * @throws DateTimeException if the result exceeds the supported date range
1151      */
1152     public OffsetDateTime plusMonths(long months) {
1153         return with(dateTime.plusMonths(months), offset);
1154     }
1155 
1156     /**
1157      * Returns a copy of this OffsetDateTime with the specified period in weeks added.
1158      * <p>
1159      * This method adds the specified amount in weeks to the days field incrementing
1160      * the month and year fields as necessary to ensure the result remains valid.
1161      * The result is only invalid if the maximum/minimum year is exceeded.
1162      * <p>
1163      * For example, 2008-12-31 plus one week would result in the 2009-01-07.
1164      * <p>
1165      * This instance is immutable and unaffected by this method call.
1166      *
1167      * @param weeks  the weeks to add, may be negative
1168      * @return an {@code OffsetDateTime} based on this date-time with the weeks added, not null
1169      * @throws DateTimeException if the result exceeds the supported date range
1170      */
1171     public OffsetDateTime plusWeeks(long weeks) {
1172         return with(dateTime.plusWeeks(weeks), offset);
1173     }
1174 
1175     /**
1176      * Returns a copy of this OffsetDateTime with the specified period in days added.
1177      * <p>
1178      * This method adds the specified amount to the days field incrementing the
1179      * month and year fields as necessary to ensure the result remains valid.
1180      * The result is only invalid if the maximum/minimum year is exceeded.
1181      * <p>
1182      * For example, 2008-12-31 plus one day would result in the 2009-01-01.
1183      * <p>
1184      * This instance is immutable and unaffected by this method call.
1185      *
1186      * @param days  the days to add, may be negative
1187      * @return an {@code OffsetDateTime} based on this date-time with the days added, not null
1188      * @throws DateTimeException if the result exceeds the supported date range
1189      */
1190     public OffsetDateTime plusDays(long days) {
1191         return with(dateTime.plusDays(days), offset);
1192     }
1193 
1194     /**
1195      * Returns a copy of this {@code OffsetDateTime} with the specified period in hours added.
1196      * <p>
1197      * This instance is immutable and unaffected by this method call.
1198      *
1199      * @param hours  the hours to add, may be negative
1200      * @return an {@code OffsetDateTime} based on this date-time with the hours added, not null
1201      * @throws DateTimeException if the result exceeds the supported date range
1202      */
1203     public OffsetDateTime plusHours(long hours) {
1204         return with(dateTime.plusHours(hours), offset);
1205     }
1206 
1207     /**
1208      * Returns a copy of this {@code OffsetDateTime} with the specified period in minutes added.
1209      * <p>
1210      * This instance is immutable and unaffected by this method call.
1211      *
1212      * @param minutes  the minutes to add, may be negative
1213      * @return an {@code OffsetDateTime} based on this date-time with the minutes added, not null
1214      * @throws DateTimeException if the result exceeds the supported date range
1215      */
1216     public OffsetDateTime plusMinutes(long minutes) {
1217         return with(dateTime.plusMinutes(minutes), offset);
1218     }
1219 
1220     /**
1221      * Returns a copy of this {@code OffsetDateTime} with the specified period in seconds added.
1222      * <p>
1223      * This instance is immutable and unaffected by this method call.
1224      *
1225      * @param seconds  the seconds to add, may be negative
1226      * @return an {@code OffsetDateTime} based on this date-time with the seconds added, not null
1227      * @throws DateTimeException if the result exceeds the supported date range
1228      */
1229     public OffsetDateTime plusSeconds(long seconds) {
1230         return with(dateTime.plusSeconds(seconds), offset);
1231     }
1232 
1233     /**
1234      * Returns a copy of this {@code OffsetDateTime} with the specified period in nanoseconds added.
1235      * <p>
1236      * This instance is immutable and unaffected by this method call.
1237      *
1238      * @param nanos  the nanos to add, may be negative
1239      * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds added, not null
1240      * @throws DateTimeException if the unit cannot be added to this type
1241      */
1242     public OffsetDateTime plusNanos(long nanos) {
1243         return with(dateTime.plusNanos(nanos), offset);
1244     }
1245 
1246     //-----------------------------------------------------------------------
1247     /**
1248      * Returns a copy of this date-time with the specified amount subtracted.
1249      * <p>
1250      * This returns an {@code OffsetDateTime}, based on this one, with the specified amount subtracted.
1251      * The amount is typically {@link Period} or {@link Duration} but may be
1252      * any other type implementing the {@link TemporalAmount} interface.
1253      * <p>
1254      * The calculation is delegated to the amount object by calling
1255      * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
1256      * to implement the subtraction in any way it wishes, however it typically
1257      * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
1258      * of the amount implementation to determine if it can be successfully subtracted.
1259      * <p>
1260      * This instance is immutable and unaffected by this method call.
1261      *
1262      * @param amountToSubtract  the amount to subtract, not null
1263      * @return an {@code OffsetDateTime} based on this date-time with the subtraction made, not null
1264      * @throws DateTimeException if the subtraction cannot be made
1265      * @throws ArithmeticException if numeric overflow occurs
1266      */
1267     @Override
1268     public OffsetDateTime minus(TemporalAmount amountToSubtract) {
1269         return (OffsetDateTime) amountToSubtract.subtractFrom(this);
1270     }
1271 
1272     /**
1273      * Returns a copy of this date-time with the specified amount subtracted.
1274      * <p>
1275      * This returns an {@code OffsetDateTime}, based on this one, with the amount
1276      * in terms of the unit subtracted. If it is not possible to subtract the amount,
1277      * because the unit is not supported or for some other reason, an exception is thrown.
1278      * <p>
1279      * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
1280      * See that method for a full description of how addition, and thus subtraction, works.
1281      * <p>
1282      * This instance is immutable and unaffected by this method call.
1283      *
1284      * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
1285      * @param unit  the unit of the amount to subtract, not null
1286      * @return an {@code OffsetDateTime} based on this date-time with the specified amount subtracted, not null
1287      * @throws DateTimeException if the subtraction cannot be made
1288      * @throws ArithmeticException if numeric overflow occurs
1289      */
1290     @Override
1291     public OffsetDateTime minus(long amountToSubtract, TemporalUnit unit) {
1292         return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
1293     }
1294 
1295     //-----------------------------------------------------------------------
1296     /**
1297      * Returns a copy of this {@code OffsetDateTime} with the specified period in years subtracted.
1298      * <p>
1299      * This method subtracts the specified amount from the years field in three steps:
1300      * <ol>
1301      * <li>Subtract the input years to the year field</li>
1302      * <li>Check if the resulting date would be invalid</li>
1303      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1304      * </ol>
1305      * <p>
1306      * For example, 2008-02-29 (leap year) minus one year would result in the
1307      * invalid date 2009-02-29 (standard year). Instead of returning an invalid
1308      * result, the last valid day of the month, 2009-02-28, is selected instead.
1309      * <p>
1310      * This instance is immutable and unaffected by this method call.
1311      *
1312      * @param years  the years to subtract, may be negative
1313      * @return an {@code OffsetDateTime} based on this date-time with the years subtracted, not null
1314      * @throws DateTimeException if the result exceeds the supported date range
1315      */
1316     public OffsetDateTime minusYears(long years) {
1317         return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
1318     }
1319 
1320     /**
1321      * Returns a copy of this {@code OffsetDateTime} with the specified period in months subtracted.
1322      * <p>
1323      * This method subtracts the specified amount from the months field in three steps:
1324      * <ol>
1325      * <li>Subtract the input months to the month-of-year field</li>
1326      * <li>Check if the resulting date would be invalid</li>
1327      * <li>Adjust the day-of-month to the last valid day if necessary</li>
1328      * </ol>
1329      * <p>
1330      * For example, 2007-03-31 minus one month would result in the invalid date
1331      * 2007-04-31. Instead of returning an invalid result, the last valid day
1332      * of the month, 2007-04-30, is selected instead.
1333      * <p>
1334      * This instance is immutable and unaffected by this method call.
1335      *
1336      * @param months  the months to subtract, may be negative
1337      * @return an {@code OffsetDateTime} based on this date-time with the months subtracted, not null
1338      * @throws DateTimeException if the result exceeds the supported date range
1339      */
1340     public OffsetDateTime minusMonths(long months) {
1341         return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
1342     }
1343 
1344     /**
1345      * Returns a copy of this {@code OffsetDateTime} with the specified period in weeks subtracted.
1346      * <p>
1347      * This method subtracts the specified amount in weeks from the days field decrementing
1348      * the month and year fields as necessary to ensure the result remains valid.
1349      * The result is only invalid if the maximum/minimum year is exceeded.
1350      * <p>
1351      * For example, 2008-12-31 minus one week would result in the 2009-01-07.
1352      * <p>
1353      * This instance is immutable and unaffected by this method call.
1354      *
1355      * @param weeks  the weeks to subtract, may be negative
1356      * @return an {@code OffsetDateTime} based on this date-time with the weeks subtracted, not null
1357      * @throws DateTimeException if the result exceeds the supported date range
1358      */
1359     public OffsetDateTime minusWeeks(long weeks) {
1360         return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
1361     }
1362 
1363     /**
1364      * Returns a copy of this {@code OffsetDateTime} with the specified period in days subtracted.
1365      * <p>
1366      * This method subtracts the specified amount from the days field incrementing the
1367      * month and year fields as necessary to ensure the result remains valid.
1368      * The result is only invalid if the maximum/minimum year is exceeded.
1369      * <p>
1370      * For example, 2008-12-31 minus one day would result in the 2009-01-01.
1371      * <p>
1372      * This instance is immutable and unaffected by this method call.
1373      *
1374      * @param days  the days to subtract, may be negative
1375      * @return an {@code OffsetDateTime} based on this date-time with the days subtracted, not null
1376      * @throws DateTimeException if the result exceeds the supported date range
1377      */
1378     public OffsetDateTime minusDays(long days) {
1379         return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
1380     }
1381 
1382     /**
1383      * Returns a copy of this {@code OffsetDateTime} with the specified period in hours subtracted.
1384      * <p>
1385      * This instance is immutable and unaffected by this method call.
1386      *
1387      * @param hours  the hours to subtract, may be negative
1388      * @return an {@code OffsetDateTime} based on this date-time with the hours subtracted, not null
1389      * @throws DateTimeException if the result exceeds the supported date range
1390      */
1391     public OffsetDateTime minusHours(long hours) {
1392         return (hours == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hours));
1393     }
1394 
1395     /**
1396      * Returns a copy of this {@code OffsetDateTime} with the specified period in minutes subtracted.
1397      * <p>
1398      * This instance is immutable and unaffected by this method call.
1399      *
1400      * @param minutes  the minutes to subtract, may be negative
1401      * @return an {@code OffsetDateTime} based on this date-time with the minutes subtracted, not null
1402      * @throws DateTimeException if the result exceeds the supported date range
1403      */
1404     public OffsetDateTime minusMinutes(long minutes) {
1405         return (minutes == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutes));
1406     }
1407 
1408     /**
1409      * Returns a copy of this {@code OffsetDateTime} with the specified period in seconds subtracted.
1410      * <p>
1411      * This instance is immutable and unaffected by this method call.
1412      *
1413      * @param seconds  the seconds to subtract, may be negative
1414      * @return an {@code OffsetDateTime} based on this date-time with the seconds subtracted, not null
1415      * @throws DateTimeException if the result exceeds the supported date range
1416      */
1417     public OffsetDateTime minusSeconds(long seconds) {
1418         return (seconds == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-seconds));
1419     }
1420 
1421     /**
1422      * Returns a copy of this {@code OffsetDateTime} with the specified period in nanoseconds subtracted.
1423      * <p>
1424      * This instance is immutable and unaffected by this method call.
1425      *
1426      * @param nanos  the nanos to subtract, may be negative
1427      * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds subtracted, not null
1428      * @throws DateTimeException if the result exceeds the supported date range
1429      */
1430     public OffsetDateTime minusNanos(long nanos) {
1431         return (nanos == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanos));
1432     }
1433 
1434     //-----------------------------------------------------------------------
1435     /**
1436      * Queries this date-time using the specified query.
1437      * <p>
1438      * This queries this date-time using the specified query strategy object.
1439      * The {@code TemporalQuery} object defines the logic to be used to
1440      * obtain the result. Read the documentation of the query to understand
1441      * what the result of this method will be.
1442      * <p>
1443      * The result of this method is obtained by invoking the
1444      * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
1445      * specified query passing {@code this} as the argument.
1446      *
1447      * @param <R> the type of the result
1448      * @param query  the query to invoke, not null
1449      * @return the query result, null may be returned (defined by the query)
1450      * @throws DateTimeException if unable to query (defined by the query)
1451      * @throws ArithmeticException if numeric overflow occurs (defined by the query)
1452      */
1453     @SuppressWarnings("unchecked")
1454     @Override
1455     public <R> R query(TemporalQuery<R> query) {
1456         if (query == Queries.offset() || query == Queries.zone()) {
1457             return (R) getOffset();
1458         } else if (query == Queries.zoneId()) {
1459             return null;
1460         } else if (query == Queries.localDate()) {
1461             return (R) toLocalDate();
1462         } else if (query == Queries.localTime()) {
1463             return (R) toLocalTime();
1464         } else if (query == Queries.chronology()) {
1465             return (R) IsoChronology.INSTANCE;
1466         } else if (query == Queries.precision()) {
1467             return (R) NANOS;
1468         }
1469         // inline TemporalAccessor.super.query(query) as an optimization
1470         // non-JDK classes are not permitted to make this optimization
1471         return query.queryFrom(this);
1472     }
1473 
1474     /**
1475      * Adjusts the specified temporal object to have the same offset, date
1476      * and time as this object.
1477      * <p>
1478      * This returns a temporal object of the same observable type as the input
1479      * with the offset, date and time changed to be the same as this.
1480      * <p>
1481      * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
1482      * three times, passing {@link ChronoField#OFFSET_SECONDS},
1483      * {@link ChronoField#EPOCH_DAY} and {@link ChronoField#NANO_OF_DAY} as the fields.
1484      * <p>
1485      * In most cases, it is clearer to reverse the calling pattern by using
1486      * {@link Temporal#with(TemporalAdjuster)}:
1487      * <pre>
1488      *   // these two lines are equivalent, but the second approach is recommended
1489      *   temporal = thisOffsetDateTime.adjustInto(temporal);
1490      *   temporal = temporal.with(thisOffsetDateTime);
1491      * </pre>
1492      * <p>
1493      * This instance is immutable and unaffected by this method call.
1494      *
1495      * @param temporal  the target object to be adjusted, not null
1496      * @return the adjusted object, not null
1497      * @throws DateTimeException if unable to make the adjustment
1498      * @throws ArithmeticException if numeric overflow occurs
1499      */
1500     @Override
1501     public Temporal adjustInto(Temporal temporal) {
1502         return temporal
1503                 .with(OFFSET_SECONDS, getOffset().getTotalSeconds())
1504                 .with(EPOCH_DAY, toLocalDate().toEpochDay())
1505                 .with(NANO_OF_DAY, toLocalTime().toNanoOfDay());
1506     }
1507 
1508     /**
1509      * Calculates the period between this date-time and another date-time in
1510      * terms of the specified unit.
1511      * <p>
1512      * This calculates the period between two date-times in terms of a single unit.
1513      * The start and end points are {@code this} and the specified date-time.
1514      * The result will be negative if the end is before the start.
1515      * For example, the period in days between two date-times can be calculated
1516      * using {@code startDateTime.periodUntil(endDateTime, DAYS)}.
1517      * <p>
1518      * The {@code Temporal} passed to this method must be an {@code OffsetDateTime}.
1519      * If the offset differs between the two date-times, the specified
1520      * end date-time is normalized to have the same offset as this date-time.
1521      * <p>
1522      * The calculation returns a whole number, representing the number of
1523      * complete units between the two date-times.
1524      * For example, the period in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
1525      * will only be one month as it is one minute short of two months.
1526      * <p>
1527      * There are two equivalent ways of using this method.
1528      * The first is to invoke this method.
1529      * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
1530      * <pre>
1531      *   // these two lines are equivalent
1532      *   amount = start.periodUntil(end, MONTHS);
1533      *   amount = MONTHS.between(start, end);
1534      * </pre>
1535      * The choice should be made based on which makes the code more readable.
1536      * <p>
1537      * The calculation is implemented in this method for {@link ChronoUnit}.
1538      * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
1539      * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
1540      * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
1541      * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
1542      * Other {@code ChronoUnit} values will throw an exception.
1543      * <p>
1544      * If the unit is not a {@code ChronoUnit}, then the result of this method
1545      * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
1546      * passing {@code this} as the first argument and the input temporal as
1547      * the second argument.
1548      * <p>
1549      * This instance is immutable and unaffected by this method call.
1550      *
1551      * @param endDateTime  the end date-time, which must be an {@code OffsetDateTime}, not null
1552      * @param unit  the unit to measure the period in, not null
1553      * @return the amount of the period between this date-time and the end date-time
1554      * @throws DateTimeException if the period cannot be calculated
1555      * @throws ArithmeticException if numeric overflow occurs
1556      */
1557     @Override
1558     public long periodUntil(Temporal endDateTime, TemporalUnit unit) {
1559         if (endDateTime instanceof OffsetDateTime == false) {
1560             Objects.requireNonNull(endDateTime, "endDateTime");
1561             throw new DateTimeException("Unable to calculate period between objects of two different types");
1562         }
1563         if (unit instanceof ChronoUnit) {
1564             OffsetDateTime end = (OffsetDateTime) endDateTime;
1565             end = end.withOffsetSameInstant(offset);
1566             return dateTime.periodUntil(end.dateTime, unit);
1567         }
1568         return unit.between(this, endDateTime);
1569     }
1570 
1571     //-----------------------------------------------------------------------
1572     /**
1573      * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1574      * ensuring that the result has the same instant.
1575      * <p>
1576      * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1577      * This conversion will ignore the visible local date-time and use the underlying instant instead.
1578      * This avoids any problems with local time-line gaps or overlaps.
1579      * The result might have different values for fields such as hour, minute an even day.
1580      * <p>
1581      * To attempt to retain the values of the fields, use {@link #atZoneSimilarLocal(ZoneId)}.
1582      * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1583      *
1584      * @param zone  the time-zone to use, not null
1585      * @return the zoned date-time formed from this date-time, not null
1586      */
1587     public ZonedDateTime atZoneSameInstant(ZoneId zone) {
1588         return ZonedDateTime.ofInstant(dateTime, offset, zone);
1589     }
1590 
1591     /**
1592      * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
1593      * trying to keep the same local date and time.
1594      * <p>
1595      * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
1596      * Where possible, the result will have the same local date-time as this object.
1597      * <p>
1598      * Time-zone rules, such as daylight savings, mean that not every time on the
1599      * local time-line exists. If the local date-time is in a gap or overlap according to
1600      * the rules then a resolver is used to determine the resultant local time and offset.
1601      * This method uses {@link ZonedDateTime#ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
1602      * to retain the offset from this instance if possible.
1603      * <p>
1604      * Finer control over gaps and overlaps is available in two ways.
1605      * If you simply want to use the later offset at overlaps then call
1606      * {@link ZonedDateTime#withLaterOffsetAtOverlap()} immediately after this method.
1607      * <p>
1608      * To create a zoned date-time at the same instant irrespective of the local time-line,
1609      * use {@link #atZoneSameInstant(ZoneId)}.
1610      * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
1611      *
1612      * @param zone  the time-zone to use, not null
1613      * @return the zoned date-time formed from this date and the earliest valid time for the zone, not null
1614      */
1615     public ZonedDateTime atZoneSimilarLocal(ZoneId zone) {
1616         return ZonedDateTime.ofLocal(dateTime, zone, offset);
1617     }
1618 
1619     //-----------------------------------------------------------------------
1620     /**
1621      * Converts this date-time to an {@code OffsetTime}.
1622      * <p>
1623      * This returns an offset time with the same local time and offset.
1624      *
1625      * @return an OffsetTime representing the time and offset, not null
1626      */
1627     public OffsetTime toOffsetTime() {
1628         return OffsetTime.of(dateTime.toLocalTime(), offset);
1629     }
1630 
1631     /**
1632      * Converts this date-time to a {@code ZonedDateTime} using the offset as the zone ID.
1633      * <p>
1634      * This creates the simplest possible {@code ZonedDateTime} using the offset
1635      * as the zone ID.
1636      * <p>
1637      * To control the time-zone used, see {@link #atZoneSameInstant(ZoneId)} and
1638      * {@link #atZoneSimilarLocal(ZoneId)}.
1639      *
1640      * @return a zoned date-time representing the same local date-time and offset, not null
1641      */
1642     public ZonedDateTime toZonedDateTime() {
1643         return ZonedDateTime.of(dateTime, offset);
1644     }
1645 
1646     /**
1647      * Converts this date-time to an {@code Instant}.
1648      * <p>
1649      * This returns an {@code Instant} representing the same point on the
1650      * time-line as this date-time.
1651      *
1652      * @return an {@code Instant} representing the same instant, not null
1653      */
1654     public Instant toInstant() {
1655         return dateTime.toInstant(offset);
1656     }
1657 
1658     /**
1659      * Converts this date-time to the number of seconds from the epoch of 1970-01-01T00:00:00Z.
1660      * <p>
1661      * This allows this date-time to be converted to a value of the
1662      * {@link ChronoField#INSTANT_SECONDS epoch-seconds} field. This is primarily
1663      * intended for low-level conversions rather than general application usage.
1664      *
1665      * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
1666      */
1667     public long toEpochSecond() {
1668         return dateTime.toEpochSecond(offset);
1669     }
1670 
1671     //-----------------------------------------------------------------------
1672     /**
1673      * Compares this {@code OffsetDateTime} to another date-time.
1674      * <p>
1675      * The comparison is based on the instant then on the local date-time.
1676      * It is "consistent with equals", as defined by {@link Comparable}.
1677      * <p>
1678      * For example, the following is the comparator order:
1679      * <ol>
1680      * <li>{@code 2008-12-03T10:30+01:00}</li>
1681      * <li>{@code 2008-12-03T11:00+01:00}</li>
1682      * <li>{@code 2008-12-03T12:00+02:00}</li>
1683      * <li>{@code 2008-12-03T11:30+01:00}</li>
1684      * <li>{@code 2008-12-03T12:00+01:00}</li>
1685      * <li>{@code 2008-12-03T12:30+01:00}</li>
1686      * </ol>
1687      * Values #2 and #3 represent the same instant on the time-line.
1688      * When two values represent the same instant, the local date-time is compared
1689      * to distinguish them. This step is needed to make the ordering
1690      * consistent with {@code equals()}.
1691      *
1692      * @param other  the other date-time to compare to, not null
1693      * @return the comparator value, negative if less, positive if greater
1694      */
1695     @Override
1696     public int compareTo(OffsetDateTime other) {
1697         if (getOffset().equals(other.getOffset())) {
1698             return toLocalDateTime().compareTo(other.toLocalDateTime());
1699         }
1700         int cmp = Long.compare(toEpochSecond(), other.toEpochSecond());
1701         if (cmp == 0) {
1702             cmp = toLocalTime().getNano() - other.toLocalTime().getNano();
1703             if (cmp == 0) {
1704                 cmp = toLocalDateTime().compareTo(other.toLocalDateTime());
1705             }
1706         }
1707         return cmp;
1708     }
1709 
1710     //-----------------------------------------------------------------------
1711     /**
1712      * Checks if the instant of this date-time is after that of the specified date-time.
1713      * <p>
1714      * This method differs from the comparison in {@link #compareTo} and {@link #equals} in that it
1715      * only compares the instant of the date-time. This is equivalent to using
1716      * {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.
1717      *
1718      * @param other  the other date-time to compare to, not null
1719      * @return true if this is after the instant of the specified date-time
1720      */
1721     public boolean isAfter(OffsetDateTime other) {
1722         long thisEpochSec = toEpochSecond();
1723         long otherEpochSec = other.toEpochSecond();
1724         return thisEpochSec > otherEpochSec ||
1725             (thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());
1726     }
1727 
1728     /**
1729      * Checks if the instant of this date-time is before that of the specified date-time.
1730      * <p>
1731      * This method differs from the comparison in {@link #compareTo} in that it
1732      * only compares the instant of the date-time. This is equivalent to using
1733      * {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.
1734      *
1735      * @param other  the other date-time to compare to, not null
1736      * @return true if this is before the instant of the specified date-time
1737      */
1738     public boolean isBefore(OffsetDateTime other) {
1739         long thisEpochSec = toEpochSecond();
1740         long otherEpochSec = other.toEpochSecond();
1741         return thisEpochSec < otherEpochSec ||
1742             (thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());
1743     }
1744 
1745     /**
1746      * Checks if the instant of this date-time is equal to that of the specified date-time.
1747      * <p>
1748      * This method differs from the comparison in {@link #compareTo} and {@link #equals}
1749      * in that it only compares the instant of the date-time. This is equivalent to using
1750      * {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.
1751      *
1752      * @param other  the other date-time to compare to, not null
1753      * @return true if the instant equals the instant of the specified date-time
1754      */
1755     public boolean isEqual(OffsetDateTime other) {
1756         return toEpochSecond() == other.toEpochSecond() &&
1757                 toLocalTime().getNano() == other.toLocalTime().getNano();
1758     }
1759 
1760     //-----------------------------------------------------------------------
1761     /**
1762      * Checks if this date-time is equal to another date-time.
1763      * <p>
1764      * The comparison is based on the local date-time and the offset.
1765      * To compare for the same instant on the time-line, use {@link #isEqual}.
1766      * Only objects of type {@code OffsetDateTime} are compared, other types return false.
1767      *
1768      * @param obj  the object to check, null returns false
1769      * @return true if this is equal to the other date-time
1770      */
1771     @Override
1772     public boolean equals(Object obj) {
1773         if (this == obj) {
1774             return true;
1775         }
1776         if (obj instanceof OffsetDateTime) {
1777             OffsetDateTime other = (OffsetDateTime) obj;
1778             return dateTime.equals(other.dateTime) && offset.equals(other.offset);
1779         }
1780         return false;
1781     }
1782 
1783     /**
1784      * A hash code for this date-time.
1785      *
1786      * @return a suitable hash code
1787      */
1788     @Override
1789     public int hashCode() {
1790         return dateTime.hashCode() ^ offset.hashCode();
1791     }
1792 
1793     //-----------------------------------------------------------------------
1794     /**
1795      * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30+01:00}.
1796      * <p>
1797      * The output will be one of the following ISO-8601 formats:
1798      * <p><ul>
1799      * <li>{@code yyyy-MM-dd'T'HH:mmXXXXX}</li>
1800      * <li>{@code yyyy-MM-dd'T'HH:mm:ssXXXXX}</li>
1801      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX}</li>
1802      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSSSSSXXXXX}</li>
1803      * <li>{@code yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSXXXXX}</li>
1804      * </ul><p>
1805      * The format used will be the shortest that outputs the full value of
1806      * the time where the omitted parts are implied to be zero.
1807      *
1808      * @return a string representation of this date-time, not null
1809      */
1810     @Override
1811     public String toString() {
1812         return dateTime.toString() + offset.toString();
1813     }
1814 
1815     /**
1816      * Outputs this date-time as a {@code String} using the formatter.
1817      * <p>
1818      * This date-time will be passed to the formatter
1819      * {@link DateTimeFormatter#format(TemporalAccessor) format method}.
1820      *
1821      * @param formatter  the formatter to use, not null
1822      * @return the formatted date-time string, not null
1823      * @throws DateTimeException if an error occurs during printing
1824      */
1825     public String toString(DateTimeFormatter formatter) {
1826         Objects.requireNonNull(formatter, "formatter");
1827         return formatter.format(this);
1828     }
1829 
1830     //-----------------------------------------------------------------------
1831     /**
1832      * Writes the object using a
1833      * <a href="../../../serialized-form.html#java.time.temporal.Ser">dedicated serialized form</a>.
1834      * <pre>
1835      *  out.writeByte(10);  // identifies this as a OffsetDateTime
1836      *  out.writeObject(dateTime);
1837      *  out.writeObject(offset);
1838      * </pre>
1839      *
1840      * @return the instance of {@code Ser}, not null
1841      */
1842     private Object writeReplace() {
1843         return new Ser(Ser.OFFSET_DATE_TIME_TYPE, this);
1844     }
1845 
1846     /**
1847      * Defend against malicious streams.
1848      * @return never
1849      * @throws InvalidObjectException always
1850      */
1851     private Object readResolve() throws ObjectStreamException {
1852         throw new InvalidObjectException("Deserialization via serialization delegate");
1853     }
1854 
1855     void writeExternal(ObjectOutput out) throws IOException {
1856         out.writeObject(dateTime);
1857         out.writeObject(offset);
1858     }
1859 
1860     static OffsetDateTime readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
1861         LocalDateTime dateTime = (LocalDateTime) in.readObject();
1862         ZoneOffset offset = (ZoneOffset) in.readObject();
1863         return OffsetDateTime.of(dateTime, offset);
1864     }
1865 
1866 }