1 /* 2 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file: 31 * 32 * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos 33 * 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions are met: 38 * 39 * * Redistributions of source code must retain the above copyright notice, 40 * this list of conditions and the following disclaimer. 41 * 42 * * Redistributions in binary form must reproduce the above copyright notice, 43 * this list of conditions and the following disclaimer in the documentation 44 * and/or other materials provided with the distribution. 45 * 46 * * Neither the name of JSR-310 nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61 */ 62 package java.time; 63 64 import static java.time.LocalTime.HOURS_PER_DAY; 65 import static java.time.LocalTime.MICROS_PER_DAY; 66 import static java.time.LocalTime.MILLIS_PER_DAY; 67 import static java.time.LocalTime.MINUTES_PER_DAY; 68 import static java.time.LocalTime.NANOS_PER_DAY; 69 import static java.time.LocalTime.NANOS_PER_HOUR; 70 import static java.time.LocalTime.NANOS_PER_MINUTE; 71 import static java.time.LocalTime.NANOS_PER_SECOND; 72 import static java.time.LocalTime.SECONDS_PER_DAY; 73 import static java.time.temporal.ChronoField.NANO_OF_SECOND; 74 75 import java.io.DataInput; 76 import java.io.DataOutput; 77 import java.io.IOException; 78 import java.io.InvalidObjectException; 79 import java.io.ObjectInputStream; 80 import java.io.Serializable; 81 import java.time.chrono.ChronoLocalDateTime; 82 import java.time.format.DateTimeFormatter; 83 import java.time.format.DateTimeParseException; 84 import java.time.temporal.ChronoField; 85 import java.time.temporal.ChronoUnit; 86 import java.time.temporal.Temporal; 87 import java.time.temporal.TemporalAccessor; 88 import java.time.temporal.TemporalAdjuster; 89 import java.time.temporal.TemporalAmount; 90 import java.time.temporal.TemporalField; 91 import java.time.temporal.TemporalQueries; 92 import java.time.temporal.TemporalQuery; 93 import java.time.temporal.TemporalUnit; 94 import java.time.temporal.UnsupportedTemporalTypeException; 95 import java.time.temporal.ValueRange; 96 import java.time.zone.ZoneRules; 97 import java.util.Objects; 98 99 /** 100 * A date-time without a time-zone in the ISO-8601 calendar system, 101 * such as {@code 2007-12-03T10:15:30}. 102 * <p> 103 * {@code LocalDateTime} is an immutable date-time object that represents a date-time, 104 * often viewed as year-month-day-hour-minute-second. Other date and time fields, 105 * such as day-of-year, day-of-week and week-of-year, can also be accessed. 106 * Time is represented to nanosecond precision. 107 * For example, the value "2nd October 2007 at 13:45.30.123456789" can be 108 * stored in a {@code LocalDateTime}. 109 * <p> 110 * This class does not store or represent a time-zone. 111 * Instead, it is a description of the date, as used for birthdays, combined with 112 * the local time as seen on a wall clock. 113 * It cannot represent an instant on the time-line without additional information 114 * such as an offset or time-zone. 115 * <p> 116 * The ISO-8601 calendar system is the modern civil calendar system used today 117 * in most of the world. It is equivalent to the proleptic Gregorian calendar 118 * system, in which today's rules for leap years are applied for all time. 119 * For most applications written today, the ISO-8601 rules are entirely suitable. 120 * However, any application that makes use of historical dates, and requires them 121 * to be accurate will find the ISO-8601 approach unsuitable. 122 * 123 * <p> 124 * This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a> 125 * class; use of identity-sensitive operations (including reference equality 126 * ({@code ==}), identity hash code, or synchronization) on instances of 127 * {@code LocalDateTime} may have unpredictable results and should be avoided. 128 * The {@code equals} method should be used for comparisons. 129 * 130 * @implSpec 131 * This class is immutable and thread-safe. 132 * 133 * @since 1.8 134 */ 135 public final class LocalDateTime 136 implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable { 137 138 /** 139 * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'. 140 * This is the local date-time of midnight at the start of the minimum date. 141 * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}. 142 * This could be used by an application as a "far past" date-time. 143 */ 144 public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN); 145 /** 146 * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'. 147 * This is the local date-time just before midnight at the end of the maximum date. 148 * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}. 149 * This could be used by an application as a "far future" date-time. 150 */ 151 public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX); 152 153 /** 154 * Serialization version. 155 */ 156 private static final long serialVersionUID = 6207766400415563566L; 157 158 /** 159 * The date part. 160 */ 161 private final LocalDate date; 162 /** 163 * The time part. 164 */ 165 private final LocalTime time; 166 167 //----------------------------------------------------------------------- 168 /** 169 * Obtains the current date-time from the system clock in the default time-zone. 170 * <p> 171 * This will query the {@link Clock#systemDefaultZone() system clock} in the default 172 * time-zone to obtain the current date-time. 173 * <p> 174 * Using this method will prevent the ability to use an alternate clock for testing 175 * because the clock is hard-coded. 176 * 177 * @return the current date-time using the system clock and default time-zone, not null 178 */ 179 public static LocalDateTime now() { 180 return now(Clock.systemDefaultZone()); 181 } 182 183 /** 184 * Obtains the current date-time from the system clock in the specified time-zone. 185 * <p> 186 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time. 187 * Specifying the time-zone avoids dependence on the default time-zone. 188 * <p> 189 * Using this method will prevent the ability to use an alternate clock for testing 190 * because the clock is hard-coded. 191 * 192 * @param zone the zone ID to use, not null 193 * @return the current date-time using the system clock, not null 194 */ 195 public static LocalDateTime now(ZoneId zone) { 196 return now(Clock.system(zone)); 197 } 198 199 /** 200 * Obtains the current date-time from the specified clock. 201 * <p> 202 * This will query the specified clock to obtain the current date-time. 203 * Using this method allows the use of an alternate clock for testing. 204 * The alternate clock may be introduced using {@link Clock dependency injection}. 205 * 206 * @param clock the clock to use, not null 207 * @return the current date-time, not null 208 */ 209 public static LocalDateTime now(Clock clock) { 210 Objects.requireNonNull(clock, "clock"); 211 final Instant now = clock.instant(); // called once 212 ZoneOffset offset = clock.getZone().getRules().getOffset(now); 213 return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset); 214 } 215 216 //----------------------------------------------------------------------- 217 /** 218 * Obtains an instance of {@code LocalDateTime} from year, month, 219 * day, hour and minute, setting the second and nanosecond to zero. 220 * <p> 221 * This returns a {@code LocalDateTime} with the specified year, month, 222 * day-of-month, hour and minute. 223 * The day must be valid for the year and month, otherwise an exception will be thrown. 224 * The second and nanosecond fields will be set to zero. 225 * 226 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 227 * @param month the month-of-year to represent, not null 228 * @param dayOfMonth the day-of-month to represent, from 1 to 31 229 * @param hour the hour-of-day to represent, from 0 to 23 230 * @param minute the minute-of-hour to represent, from 0 to 59 231 * @return the local date-time, not null 232 * @throws DateTimeException if the value of any field is out of range, 233 * or if the day-of-month is invalid for the month-year 234 */ 235 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) { 236 LocalDate date = LocalDate.of(year, month, dayOfMonth); 237 LocalTime time = LocalTime.of(hour, minute); 238 return new LocalDateTime(date, time); 239 } 240 241 /** 242 * Obtains an instance of {@code LocalDateTime} from year, month, 243 * day, hour, minute and second, setting the nanosecond to zero. 244 * <p> 245 * This returns a {@code LocalDateTime} with the specified year, month, 246 * day-of-month, hour, minute and second. 247 * The day must be valid for the year and month, otherwise an exception will be thrown. 248 * The nanosecond field will be set to zero. 249 * 250 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 251 * @param month the month-of-year to represent, not null 252 * @param dayOfMonth the day-of-month to represent, from 1 to 31 253 * @param hour the hour-of-day to represent, from 0 to 23 254 * @param minute the minute-of-hour to represent, from 0 to 59 255 * @param second the second-of-minute to represent, from 0 to 59 256 * @return the local date-time, not null 257 * @throws DateTimeException if the value of any field is out of range, 258 * or if the day-of-month is invalid for the month-year 259 */ 260 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) { 261 LocalDate date = LocalDate.of(year, month, dayOfMonth); 262 LocalTime time = LocalTime.of(hour, minute, second); 263 return new LocalDateTime(date, time); 264 } 265 266 /** 267 * Obtains an instance of {@code LocalDateTime} from year, month, 268 * day, hour, minute, second and nanosecond. 269 * <p> 270 * This returns a {@code LocalDateTime} with the specified year, month, 271 * day-of-month, hour, minute, second and nanosecond. 272 * The day must be valid for the year and month, otherwise an exception will be thrown. 273 * 274 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 275 * @param month the month-of-year to represent, not null 276 * @param dayOfMonth the day-of-month to represent, from 1 to 31 277 * @param hour the hour-of-day to represent, from 0 to 23 278 * @param minute the minute-of-hour to represent, from 0 to 59 279 * @param second the second-of-minute to represent, from 0 to 59 280 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999 281 * @return the local date-time, not null 282 * @throws DateTimeException if the value of any field is out of range, 283 * or if the day-of-month is invalid for the month-year 284 */ 285 public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) { 286 LocalDate date = LocalDate.of(year, month, dayOfMonth); 287 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond); 288 return new LocalDateTime(date, time); 289 } 290 291 //----------------------------------------------------------------------- 292 /** 293 * Obtains an instance of {@code LocalDateTime} from year, month, 294 * day, hour and minute, setting the second and nanosecond to zero. 295 * <p> 296 * This returns a {@code LocalDateTime} with the specified year, month, 297 * day-of-month, hour and minute. 298 * The day must be valid for the year and month, otherwise an exception will be thrown. 299 * The second and nanosecond fields will be set to zero. 300 * 301 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 302 * @param month the month-of-year to represent, from 1 (January) to 12 (December) 303 * @param dayOfMonth the day-of-month to represent, from 1 to 31 304 * @param hour the hour-of-day to represent, from 0 to 23 305 * @param minute the minute-of-hour to represent, from 0 to 59 306 * @return the local date-time, not null 307 * @throws DateTimeException if the value of any field is out of range, 308 * or if the day-of-month is invalid for the month-year 309 */ 310 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) { 311 LocalDate date = LocalDate.of(year, month, dayOfMonth); 312 LocalTime time = LocalTime.of(hour, minute); 313 return new LocalDateTime(date, time); 314 } 315 316 /** 317 * Obtains an instance of {@code LocalDateTime} from year, month, 318 * day, hour, minute and second, setting the nanosecond to zero. 319 * <p> 320 * This returns a {@code LocalDateTime} with the specified year, month, 321 * day-of-month, hour, minute and second. 322 * The day must be valid for the year and month, otherwise an exception will be thrown. 323 * The nanosecond field will be set to zero. 324 * 325 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 326 * @param month the month-of-year to represent, from 1 (January) to 12 (December) 327 * @param dayOfMonth the day-of-month to represent, from 1 to 31 328 * @param hour the hour-of-day to represent, from 0 to 23 329 * @param minute the minute-of-hour to represent, from 0 to 59 330 * @param second the second-of-minute to represent, from 0 to 59 331 * @return the local date-time, not null 332 * @throws DateTimeException if the value of any field is out of range, 333 * or if the day-of-month is invalid for the month-year 334 */ 335 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) { 336 LocalDate date = LocalDate.of(year, month, dayOfMonth); 337 LocalTime time = LocalTime.of(hour, minute, second); 338 return new LocalDateTime(date, time); 339 } 340 341 /** 342 * Obtains an instance of {@code LocalDateTime} from year, month, 343 * day, hour, minute, second and nanosecond. 344 * <p> 345 * This returns a {@code LocalDateTime} with the specified year, month, 346 * day-of-month, hour, minute, second and nanosecond. 347 * The day must be valid for the year and month, otherwise an exception will be thrown. 348 * 349 * @param year the year to represent, from MIN_YEAR to MAX_YEAR 350 * @param month the month-of-year to represent, from 1 (January) to 12 (December) 351 * @param dayOfMonth the day-of-month to represent, from 1 to 31 352 * @param hour the hour-of-day to represent, from 0 to 23 353 * @param minute the minute-of-hour to represent, from 0 to 59 354 * @param second the second-of-minute to represent, from 0 to 59 355 * @param nanoOfSecond the nano-of-second to represent, from 0 to 999,999,999 356 * @return the local date-time, not null 357 * @throws DateTimeException if the value of any field is out of range, 358 * or if the day-of-month is invalid for the month-year 359 */ 360 public static LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) { 361 LocalDate date = LocalDate.of(year, month, dayOfMonth); 362 LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond); 363 return new LocalDateTime(date, time); 364 } 365 366 /** 367 * Obtains an instance of {@code LocalDateTime} from a date and time. 368 * 369 * @param date the local date, not null 370 * @param time the local time, not null 371 * @return the local date-time, not null 372 */ 373 public static LocalDateTime of(LocalDate date, LocalTime time) { 374 Objects.requireNonNull(date, "date"); 375 Objects.requireNonNull(time, "time"); 376 return new LocalDateTime(date, time); 377 } 378 379 //------------------------------------------------------------------------- 380 /** 381 * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID. 382 * <p> 383 * This creates a local date-time based on the specified instant. 384 * First, the offset from UTC/Greenwich is obtained using the zone ID and instant, 385 * which is simple as there is only one valid offset for each instant. 386 * Then, the instant and offset are used to calculate the local date-time. 387 * 388 * @param instant the instant to create the date-time from, not null 389 * @param zone the time-zone, which may be an offset, not null 390 * @return the local date-time, not null 391 * @throws DateTimeException if the result exceeds the supported range 392 */ 393 public static LocalDateTime ofInstant(Instant instant, ZoneId zone) { 394 Objects.requireNonNull(instant, "instant"); 395 Objects.requireNonNull(zone, "zone"); 396 ZoneRules rules = zone.getRules(); 397 ZoneOffset offset = rules.getOffset(instant); 398 return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset); 399 } 400 401 /** 402 * Obtains an instance of {@code LocalDateTime} using seconds from the 403 * epoch of 1970-01-01T00:00:00Z. 404 * <p> 405 * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field 406 * to be converted to a local date-time. This is primarily intended for 407 * low-level conversions rather than general application usage. 408 * 409 * @param epochSecond the number of seconds from the epoch of 1970-01-01T00:00:00Z 410 * @param nanoOfSecond the nanosecond within the second, from 0 to 999,999,999 411 * @param offset the zone offset, not null 412 * @return the local date-time, not null 413 * @throws DateTimeException if the result exceeds the supported range, 414 * or if the nano-of-second is invalid 415 */ 416 public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) { 417 Objects.requireNonNull(offset, "offset"); 418 NANO_OF_SECOND.checkValidValue(nanoOfSecond); 419 long localSecond = epochSecond + offset.getTotalSeconds(); // overflow caught later 420 long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY); 421 int secsOfDay = Math.floorMod(localSecond, SECONDS_PER_DAY); 422 LocalDate date = LocalDate.ofEpochDay(localEpochDay); 423 LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + nanoOfSecond); 424 return new LocalDateTime(date, time); 425 } 426 427 //----------------------------------------------------------------------- 428 /** 429 * Obtains an instance of {@code LocalDateTime} from a temporal object. 430 * <p> 431 * This obtains a local date-time based on the specified temporal. 432 * A {@code TemporalAccessor} represents an arbitrary set of date and time information, 433 * which this factory converts to an instance of {@code LocalDateTime}. 434 * <p> 435 * The conversion extracts and combines the {@code LocalDate} and the 436 * {@code LocalTime} from the temporal object. 437 * Implementations are permitted to perform optimizations such as accessing 438 * those fields that are equivalent to the relevant objects. 439 * <p> 440 * This method matches the signature of the functional interface {@link TemporalQuery} 441 * allowing it to be used as a query via method reference, {@code LocalDateTime::from}. 442 * 443 * @param temporal the temporal object to convert, not null 444 * @return the local date-time, not null 445 * @throws DateTimeException if unable to convert to a {@code LocalDateTime} 446 */ 447 public static LocalDateTime from(TemporalAccessor temporal) { 448 if (temporal instanceof LocalDateTime) { 449 return (LocalDateTime) temporal; 450 } else if (temporal instanceof ZonedDateTime) { 451 return ((ZonedDateTime) temporal).toLocalDateTime(); 452 } else if (temporal instanceof OffsetDateTime) { 453 return ((OffsetDateTime) temporal).toLocalDateTime(); 454 } 455 try { 456 LocalDate date = LocalDate.from(temporal); 457 LocalTime time = LocalTime.from(temporal); 458 return new LocalDateTime(date, time); 459 } catch (DateTimeException ex) { 460 throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " + 461 temporal + " of type " + temporal.getClass().getName(), ex); 462 } 463 } 464 465 //----------------------------------------------------------------------- 466 /** 467 * Obtains an instance of {@code LocalDateTime} from a text string such as {@code 2007-12-03T10:15:30}. 468 * <p> 469 * The string must represent a valid date-time and is parsed using 470 * {@link java.time.format.DateTimeFormatter#ISO_LOCAL_DATE_TIME}. 471 * 472 * @param text the text to parse such as "2007-12-03T10:15:30", not null 473 * @return the parsed local date-time, not null 474 * @throws DateTimeParseException if the text cannot be parsed 475 */ 476 public static LocalDateTime parse(CharSequence text) { 477 return parse(text, DateTimeFormatter.ISO_LOCAL_DATE_TIME); 478 } 479 480 /** 481 * Obtains an instance of {@code LocalDateTime} from a text string using a specific formatter. 482 * <p> 483 * The text is parsed using the formatter, returning a date-time. 484 * 485 * @param text the text to parse, not null 486 * @param formatter the formatter to use, not null 487 * @return the parsed local date-time, not null 488 * @throws DateTimeParseException if the text cannot be parsed 489 */ 490 public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) { 491 Objects.requireNonNull(formatter, "formatter"); 492 return formatter.parse(text, LocalDateTime::from); 493 } 494 495 //----------------------------------------------------------------------- 496 /** 497 * Constructor. 498 * 499 * @param date the date part of the date-time, validated not null 500 * @param time the time part of the date-time, validated not null 501 */ 502 private LocalDateTime(LocalDate date, LocalTime time) { 503 this.date = date; 504 this.time = time; 505 } 506 507 /** 508 * Returns a copy of this date-time with the new date and time, checking 509 * to see if a new object is in fact required. 510 * 511 * @param newDate the date of the new date-time, not null 512 * @param newTime the time of the new date-time, not null 513 * @return the date-time, not null 514 */ 515 private LocalDateTime with(LocalDate newDate, LocalTime newTime) { 516 if (date == newDate && time == newTime) { 517 return this; 518 } 519 return new LocalDateTime(newDate, newTime); 520 } 521 522 //----------------------------------------------------------------------- 523 /** 524 * Checks if the specified field is supported. 525 * <p> 526 * This checks if this date-time can be queried for the specified field. 527 * If false, then calling the {@link #range(TemporalField) range}, 528 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)} 529 * methods will throw an exception. 530 * <p> 531 * If the field is a {@link ChronoField} then the query is implemented here. 532 * The supported fields are: 533 * <ul> 534 * <li>{@code NANO_OF_SECOND} 535 * <li>{@code NANO_OF_DAY} 536 * <li>{@code MICRO_OF_SECOND} 537 * <li>{@code MICRO_OF_DAY} 538 * <li>{@code MILLI_OF_SECOND} 539 * <li>{@code MILLI_OF_DAY} 540 * <li>{@code SECOND_OF_MINUTE} 541 * <li>{@code SECOND_OF_DAY} 542 * <li>{@code MINUTE_OF_HOUR} 543 * <li>{@code MINUTE_OF_DAY} 544 * <li>{@code HOUR_OF_AMPM} 545 * <li>{@code CLOCK_HOUR_OF_AMPM} 546 * <li>{@code HOUR_OF_DAY} 547 * <li>{@code CLOCK_HOUR_OF_DAY} 548 * <li>{@code AMPM_OF_DAY} 549 * <li>{@code DAY_OF_WEEK} 550 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH} 551 * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR} 552 * <li>{@code DAY_OF_MONTH} 553 * <li>{@code DAY_OF_YEAR} 554 * <li>{@code EPOCH_DAY} 555 * <li>{@code ALIGNED_WEEK_OF_MONTH} 556 * <li>{@code ALIGNED_WEEK_OF_YEAR} 557 * <li>{@code MONTH_OF_YEAR} 558 * <li>{@code PROLEPTIC_MONTH} 559 * <li>{@code YEAR_OF_ERA} 560 * <li>{@code YEAR} 561 * <li>{@code ERA} 562 * </ul> 563 * All other {@code ChronoField} instances will return false. 564 * <p> 565 * If the field is not a {@code ChronoField}, then the result of this method 566 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} 567 * passing {@code this} as the argument. 568 * Whether the field is supported is determined by the field. 569 * 570 * @param field the field to check, null returns false 571 * @return true if the field is supported on this date-time, false if not 572 */ 573 @Override 574 public boolean isSupported(TemporalField field) { 575 if (field instanceof ChronoField) { 576 ChronoField f = (ChronoField) field; 577 return f.isDateBased() || f.isTimeBased(); 578 } 579 return field != null && field.isSupportedBy(this); 580 } 581 582 /** 583 * Checks if the specified unit is supported. 584 * <p> 585 * This checks if the specified unit can be added to, or subtracted from, this date-time. 586 * If false, then calling the {@link #plus(long, TemporalUnit)} and 587 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception. 588 * <p> 589 * If the unit is a {@link ChronoUnit} then the query is implemented here. 590 * The supported units are: 591 * <ul> 592 * <li>{@code NANOS} 593 * <li>{@code MICROS} 594 * <li>{@code MILLIS} 595 * <li>{@code SECONDS} 596 * <li>{@code MINUTES} 597 * <li>{@code HOURS} 598 * <li>{@code HALF_DAYS} 599 * <li>{@code DAYS} 600 * <li>{@code WEEKS} 601 * <li>{@code MONTHS} 602 * <li>{@code YEARS} 603 * <li>{@code DECADES} 604 * <li>{@code CENTURIES} 605 * <li>{@code MILLENNIA} 606 * <li>{@code ERAS} 607 * </ul> 608 * All other {@code ChronoUnit} instances will return false. 609 * <p> 610 * If the unit is not a {@code ChronoUnit}, then the result of this method 611 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)} 612 * passing {@code this} as the argument. 613 * Whether the unit is supported is determined by the unit. 614 * 615 * @param unit the unit to check, null returns false 616 * @return true if the unit can be added/subtracted, false if not 617 */ 618 @Override // override for Javadoc 619 public boolean isSupported(TemporalUnit unit) { 620 return ChronoLocalDateTime.super.isSupported(unit); 621 } 622 623 //----------------------------------------------------------------------- 624 /** 625 * Gets the range of valid values for the specified field. 626 * <p> 627 * The range object expresses the minimum and maximum valid values for a field. 628 * This date-time is used to enhance the accuracy of the returned range. 629 * If it is not possible to return the range, because the field is not supported 630 * or for some other reason, an exception is thrown. 631 * <p> 632 * If the field is a {@link ChronoField} then the query is implemented here. 633 * The {@link #isSupported(TemporalField) supported fields} will return 634 * appropriate range instances. 635 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. 636 * <p> 637 * If the field is not a {@code ChronoField}, then the result of this method 638 * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)} 639 * passing {@code this} as the argument. 640 * Whether the range can be obtained is determined by the field. 641 * 642 * @param field the field to query the range for, not null 643 * @return the range of valid values for the field, not null 644 * @throws DateTimeException if the range for the field cannot be obtained 645 * @throws UnsupportedTemporalTypeException if the field is not supported 646 */ 647 @Override 648 public ValueRange range(TemporalField field) { 649 if (field instanceof ChronoField) { 650 ChronoField f = (ChronoField) field; 651 return (f.isTimeBased() ? time.range(field) : date.range(field)); 652 } 653 return field.rangeRefinedBy(this); 654 } 655 656 /** 657 * Gets the value of the specified field from this date-time as an {@code int}. 658 * <p> 659 * This queries this date-time for the value of the specified field. 660 * The returned value will always be within the valid range of values for the field. 661 * If it is not possible to return the value, because the field is not supported 662 * or for some other reason, an exception is thrown. 663 * <p> 664 * If the field is a {@link ChronoField} then the query is implemented here. 665 * The {@link #isSupported(TemporalField) supported fields} will return valid 666 * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY}, 667 * {@code EPOCH_DAY} and {@code PROLEPTIC_MONTH} which are too large to fit in 668 * an {@code int} and throw an {@code UnsupportedTemporalTypeException}. 669 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. 670 * <p> 671 * If the field is not a {@code ChronoField}, then the result of this method 672 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)} 673 * passing {@code this} as the argument. Whether the value can be obtained, 674 * and what the value represents, is determined by the field. 675 * 676 * @param field the field to get, not null 677 * @return the value for the field 678 * @throws DateTimeException if a value for the field cannot be obtained or 679 * the value is outside the range of valid values for the field 680 * @throws UnsupportedTemporalTypeException if the field is not supported or 681 * the range of values exceeds an {@code int} 682 * @throws ArithmeticException if numeric overflow occurs 683 */ 684 @Override 685 public int get(TemporalField field) { 686 if (field instanceof ChronoField) { 687 ChronoField f = (ChronoField) field; 688 return (f.isTimeBased() ? time.get(field) : date.get(field)); 689 } 690 return ChronoLocalDateTime.super.get(field); 691 } 692 693 /** 694 * Gets the value of the specified field from this date-time as a {@code long}. 695 * <p> 696 * This queries this date-time for the value of the specified field. 697 * If it is not possible to return the value, because the field is not supported 698 * or for some other reason, an exception is thrown. 699 * <p> 700 * If the field is a {@link ChronoField} then the query is implemented here. 701 * The {@link #isSupported(TemporalField) supported fields} will return valid 702 * values based on this date-time. 703 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. 704 * <p> 705 * If the field is not a {@code ChronoField}, then the result of this method 706 * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)} 707 * passing {@code this} as the argument. Whether the value can be obtained, 708 * and what the value represents, is determined by the field. 709 * 710 * @param field the field to get, not null 711 * @return the value for the field 712 * @throws DateTimeException if a value for the field cannot be obtained 713 * @throws UnsupportedTemporalTypeException if the field is not supported 714 * @throws ArithmeticException if numeric overflow occurs 715 */ 716 @Override 717 public long getLong(TemporalField field) { 718 if (field instanceof ChronoField) { 719 ChronoField f = (ChronoField) field; 720 return (f.isTimeBased() ? time.getLong(field) : date.getLong(field)); 721 } 722 return field.getFrom(this); 723 } 724 725 //----------------------------------------------------------------------- 726 /** 727 * Gets the {@code LocalDate} part of this date-time. 728 * <p> 729 * This returns a {@code LocalDate} with the same year, month and day 730 * as this date-time. 731 * 732 * @return the date part of this date-time, not null 733 */ 734 @Override 735 public LocalDate toLocalDate() { 736 return date; 737 } 738 739 /** 740 * Gets the year field. 741 * <p> 742 * This method returns the primitive {@code int} value for the year. 743 * <p> 744 * The year returned by this method is proleptic as per {@code get(YEAR)}. 745 * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}. 746 * 747 * @return the year, from MIN_YEAR to MAX_YEAR 748 */ 749 public int getYear() { 750 return date.getYear(); 751 } 752 753 /** 754 * Gets the month-of-year field from 1 to 12. 755 * <p> 756 * This method returns the month as an {@code int} from 1 to 12. 757 * Application code is frequently clearer if the enum {@link Month} 758 * is used by calling {@link #getMonth()}. 759 * 760 * @return the month-of-year, from 1 to 12 761 * @see #getMonth() 762 */ 763 public int getMonthValue() { 764 return date.getMonthValue(); 765 } 766 767 /** 768 * Gets the month-of-year field using the {@code Month} enum. 769 * <p> 770 * This method returns the enum {@link Month} for the month. 771 * This avoids confusion as to what {@code int} values mean. 772 * If you need access to the primitive {@code int} value then the enum 773 * provides the {@link Month#getValue() int value}. 774 * 775 * @return the month-of-year, not null 776 * @see #getMonthValue() 777 */ 778 public Month getMonth() { 779 return date.getMonth(); 780 } 781 782 /** 783 * Gets the day-of-month field. 784 * <p> 785 * This method returns the primitive {@code int} value for the day-of-month. 786 * 787 * @return the day-of-month, from 1 to 31 788 */ 789 public int getDayOfMonth() { 790 return date.getDayOfMonth(); 791 } 792 793 /** 794 * Gets the day-of-year field. 795 * <p> 796 * This method returns the primitive {@code int} value for the day-of-year. 797 * 798 * @return the day-of-year, from 1 to 365, or 366 in a leap year 799 */ 800 public int getDayOfYear() { 801 return date.getDayOfYear(); 802 } 803 804 /** 805 * Gets the day-of-week field, which is an enum {@code DayOfWeek}. 806 * <p> 807 * This method returns the enum {@link DayOfWeek} for the day-of-week. 808 * This avoids confusion as to what {@code int} values mean. 809 * If you need access to the primitive {@code int} value then the enum 810 * provides the {@link DayOfWeek#getValue() int value}. 811 * <p> 812 * Additional information can be obtained from the {@code DayOfWeek}. 813 * This includes textual names of the values. 814 * 815 * @return the day-of-week, not null 816 */ 817 public DayOfWeek getDayOfWeek() { 818 return date.getDayOfWeek(); 819 } 820 821 //----------------------------------------------------------------------- 822 /** 823 * Gets the {@code LocalTime} part of this date-time. 824 * <p> 825 * This returns a {@code LocalTime} with the same hour, minute, second and 826 * nanosecond as this date-time. 827 * 828 * @return the time part of this date-time, not null 829 */ 830 @Override 831 public LocalTime toLocalTime() { 832 return time; 833 } 834 835 /** 836 * Gets the hour-of-day field. 837 * 838 * @return the hour-of-day, from 0 to 23 839 */ 840 public int getHour() { 841 return time.getHour(); 842 } 843 844 /** 845 * Gets the minute-of-hour field. 846 * 847 * @return the minute-of-hour, from 0 to 59 848 */ 849 public int getMinute() { 850 return time.getMinute(); 851 } 852 853 /** 854 * Gets the second-of-minute field. 855 * 856 * @return the second-of-minute, from 0 to 59 857 */ 858 public int getSecond() { 859 return time.getSecond(); 860 } 861 862 /** 863 * Gets the nano-of-second field. 864 * 865 * @return the nano-of-second, from 0 to 999,999,999 866 */ 867 public int getNano() { 868 return time.getNano(); 869 } 870 871 //----------------------------------------------------------------------- 872 /** 873 * Returns an adjusted copy of this date-time. 874 * <p> 875 * This returns a {@code LocalDateTime}, based on this one, with the date-time adjusted. 876 * The adjustment takes place using the specified adjuster strategy object. 877 * Read the documentation of the adjuster to understand what adjustment will be made. 878 * <p> 879 * A simple adjuster might simply set the one of the fields, such as the year field. 880 * A more complex adjuster might set the date to the last day of the month. 881 * <p> 882 * A selection of common adjustments is provided in 883 * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}. 884 * These include finding the "last day of the month" and "next Wednesday". 885 * Key date-time classes also implement the {@code TemporalAdjuster} interface, 886 * such as {@link Month} and {@link java.time.MonthDay MonthDay}. 887 * The adjuster is responsible for handling special cases, such as the varying 888 * lengths of month and leap years. 889 * <p> 890 * For example this code returns a date on the last day of July: 891 * <pre> 892 * import static java.time.Month.*; 893 * import static java.time.temporal.TemporalAdjusters.*; 894 * 895 * result = localDateTime.with(JULY).with(lastDayOfMonth()); 896 * </pre> 897 * <p> 898 * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster}, 899 * thus this method can be used to change the date, time or offset: 900 * <pre> 901 * result = localDateTime.with(date); 902 * result = localDateTime.with(time); 903 * </pre> 904 * <p> 905 * The result of this method is obtained by invoking the 906 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the 907 * specified adjuster passing {@code this} as the argument. 908 * <p> 909 * This instance is immutable and unaffected by this method call. 910 * 911 * @param adjuster the adjuster to use, not null 912 * @return a {@code LocalDateTime} based on {@code this} with the adjustment made, not null 913 * @throws DateTimeException if the adjustment cannot be made 914 * @throws ArithmeticException if numeric overflow occurs 915 */ 916 @Override 917 public LocalDateTime with(TemporalAdjuster adjuster) { 918 // optimizations 919 if (adjuster instanceof LocalDate) { 920 return with((LocalDate) adjuster, time); 921 } else if (adjuster instanceof LocalTime) { 922 return with(date, (LocalTime) adjuster); 923 } else if (adjuster instanceof LocalDateTime) { 924 return (LocalDateTime) adjuster; 925 } 926 return (LocalDateTime) adjuster.adjustInto(this); 927 } 928 929 /** 930 * Returns a copy of this date-time with the specified field set to a new value. 931 * <p> 932 * This returns a {@code LocalDateTime}, based on this one, with the value 933 * for the specified field changed. 934 * This can be used to change any supported field, such as the year, month or day-of-month. 935 * If it is not possible to set the value, because the field is not supported or for 936 * some other reason, an exception is thrown. 937 * <p> 938 * In some cases, changing the specified field can cause the resulting date-time to become invalid, 939 * such as changing the month from 31st January to February would make the day-of-month invalid. 940 * In cases like this, the field is responsible for resolving the date. Typically it will choose 941 * the previous valid date, which would be the last valid day of February in this example. 942 * <p> 943 * If the field is a {@link ChronoField} then the adjustment is implemented here. 944 * The {@link #isSupported(TemporalField) supported fields} will behave as per 945 * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate} 946 * or {@link LocalTime#with(TemporalField, long) LocalTime}. 947 * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. 948 * <p> 949 * If the field is not a {@code ChronoField}, then the result of this method 950 * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)} 951 * passing {@code this} as the argument. In this case, the field determines 952 * whether and how to adjust the instant. 953 * <p> 954 * This instance is immutable and unaffected by this method call. 955 * 956 * @param field the field to set in the result, not null 957 * @param newValue the new value of the field in the result 958 * @return a {@code LocalDateTime} based on {@code this} with the specified field set, not null 959 * @throws DateTimeException if the field cannot be set 960 * @throws UnsupportedTemporalTypeException if the field is not supported 961 * @throws ArithmeticException if numeric overflow occurs 962 */ 963 @Override 964 public LocalDateTime with(TemporalField field, long newValue) { 965 if (field instanceof ChronoField) { 966 ChronoField f = (ChronoField) field; 967 if (f.isTimeBased()) { 968 return with(date, time.with(field, newValue)); 969 } else { 970 return with(date.with(field, newValue), time); 971 } 972 } 973 return field.adjustInto(this, newValue); 974 } 975 976 //----------------------------------------------------------------------- 977 /** 978 * Returns a copy of this {@code LocalDateTime} with the year altered. 979 * <p> 980 * The time does not affect the calculation and will be the same in the result. 981 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month. 982 * <p> 983 * This instance is immutable and unaffected by this method call. 984 * 985 * @param year the year to set in the result, from MIN_YEAR to MAX_YEAR 986 * @return a {@code LocalDateTime} based on this date-time with the requested year, not null 987 * @throws DateTimeException if the year value is invalid 988 */ 989 public LocalDateTime withYear(int year) { 990 return with(date.withYear(year), time); 991 } 992 993 /** 994 * Returns a copy of this {@code LocalDateTime} with the month-of-year altered. 995 * <p> 996 * The time does not affect the calculation and will be the same in the result. 997 * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month. 998 * <p> 999 * This instance is immutable and unaffected by this method call. 1000 * 1001 * @param month the month-of-year to set in the result, from 1 (January) to 12 (December) 1002 * @return a {@code LocalDateTime} based on this date-time with the requested month, not null 1003 * @throws DateTimeException if the month-of-year value is invalid 1004 */ 1005 public LocalDateTime withMonth(int month) { 1006 return with(date.withMonth(month), time); 1007 } 1008 1009 /** 1010 * Returns a copy of this {@code LocalDateTime} with the day-of-month altered. 1011 * <p> 1012 * If the resulting date-time is invalid, an exception is thrown. 1013 * The time does not affect the calculation and will be the same in the result. 1014 * <p> 1015 * This instance is immutable and unaffected by this method call. 1016 * 1017 * @param dayOfMonth the day-of-month to set in the result, from 1 to 28-31 1018 * @return a {@code LocalDateTime} based on this date-time with the requested day, not null 1019 * @throws DateTimeException if the day-of-month value is invalid, 1020 * or if the day-of-month is invalid for the month-year 1021 */ 1022 public LocalDateTime withDayOfMonth(int dayOfMonth) { 1023 return with(date.withDayOfMonth(dayOfMonth), time); 1024 } 1025 1026 /** 1027 * Returns a copy of this {@code LocalDateTime} with the day-of-year altered. 1028 * <p> 1029 * If the resulting date-time is invalid, an exception is thrown. 1030 * <p> 1031 * This instance is immutable and unaffected by this method call. 1032 * 1033 * @param dayOfYear the day-of-year to set in the result, from 1 to 365-366 1034 * @return a {@code LocalDateTime} based on this date with the requested day, not null 1035 * @throws DateTimeException if the day-of-year value is invalid, 1036 * or if the day-of-year is invalid for the year 1037 */ 1038 public LocalDateTime withDayOfYear(int dayOfYear) { 1039 return with(date.withDayOfYear(dayOfYear), time); 1040 } 1041 1042 //----------------------------------------------------------------------- 1043 /** 1044 * Returns a copy of this {@code LocalDateTime} with the hour-of-day altered. 1045 * <p> 1046 * This instance is immutable and unaffected by this method call. 1047 * 1048 * @param hour the hour-of-day to set in the result, from 0 to 23 1049 * @return a {@code LocalDateTime} based on this date-time with the requested hour, not null 1050 * @throws DateTimeException if the hour value is invalid 1051 */ 1052 public LocalDateTime withHour(int hour) { 1053 LocalTime newTime = time.withHour(hour); 1054 return with(date, newTime); 1055 } 1056 1057 /** 1058 * Returns a copy of this {@code LocalDateTime} with the minute-of-hour altered. 1059 * <p> 1060 * This instance is immutable and unaffected by this method call. 1061 * 1062 * @param minute the minute-of-hour to set in the result, from 0 to 59 1063 * @return a {@code LocalDateTime} based on this date-time with the requested minute, not null 1064 * @throws DateTimeException if the minute value is invalid 1065 */ 1066 public LocalDateTime withMinute(int minute) { 1067 LocalTime newTime = time.withMinute(minute); 1068 return with(date, newTime); 1069 } 1070 1071 /** 1072 * Returns a copy of this {@code LocalDateTime} with the second-of-minute altered. 1073 * <p> 1074 * This instance is immutable and unaffected by this method call. 1075 * 1076 * @param second the second-of-minute to set in the result, from 0 to 59 1077 * @return a {@code LocalDateTime} based on this date-time with the requested second, not null 1078 * @throws DateTimeException if the second value is invalid 1079 */ 1080 public LocalDateTime withSecond(int second) { 1081 LocalTime newTime = time.withSecond(second); 1082 return with(date, newTime); 1083 } 1084 1085 /** 1086 * Returns a copy of this {@code LocalDateTime} with the nano-of-second altered. 1087 * <p> 1088 * This instance is immutable and unaffected by this method call. 1089 * 1090 * @param nanoOfSecond the nano-of-second to set in the result, from 0 to 999,999,999 1091 * @return a {@code LocalDateTime} based on this date-time with the requested nanosecond, not null 1092 * @throws DateTimeException if the nano value is invalid 1093 */ 1094 public LocalDateTime withNano(int nanoOfSecond) { 1095 LocalTime newTime = time.withNano(nanoOfSecond); 1096 return with(date, newTime); 1097 } 1098 1099 //----------------------------------------------------------------------- 1100 /** 1101 * Returns a copy of this {@code LocalDateTime} with the time truncated. 1102 * <p> 1103 * Truncation returns a copy of the original date-time with fields 1104 * smaller than the specified unit set to zero. 1105 * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit 1106 * will set the second-of-minute and nano-of-second field to zero. 1107 * <p> 1108 * The unit must have a {@linkplain TemporalUnit#getDuration() duration} 1109 * that divides into the length of a standard day without remainder. 1110 * This includes all supplied time units on {@link ChronoUnit} and 1111 * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception. 1112 * <p> 1113 * This instance is immutable and unaffected by this method call. 1114 * 1115 * @param unit the unit to truncate to, not null 1116 * @return a {@code LocalDateTime} based on this date-time with the time truncated, not null 1117 * @throws DateTimeException if unable to truncate 1118 * @throws UnsupportedTemporalTypeException if the unit is not supported 1119 */ 1120 public LocalDateTime truncatedTo(TemporalUnit unit) { 1121 return with(date, time.truncatedTo(unit)); 1122 } 1123 1124 //----------------------------------------------------------------------- 1125 /** 1126 * Returns a copy of this date-time with the specified amount added. 1127 * <p> 1128 * This returns a {@code LocalDateTime}, based on this one, with the specified amount added. 1129 * The amount is typically {@link Period} or {@link Duration} but may be 1130 * any other type implementing the {@link TemporalAmount} interface. 1131 * <p> 1132 * The calculation is delegated to the amount object by calling 1133 * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free 1134 * to implement the addition in any way it wishes, however it typically 1135 * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation 1136 * of the amount implementation to determine if it can be successfully added. 1137 * <p> 1138 * This instance is immutable and unaffected by this method call. 1139 * 1140 * @param amountToAdd the amount to add, not null 1141 * @return a {@code LocalDateTime} based on this date-time with the addition made, not null 1142 * @throws DateTimeException if the addition cannot be made 1143 * @throws ArithmeticException if numeric overflow occurs 1144 */ 1145 @Override 1146 public LocalDateTime plus(TemporalAmount amountToAdd) { 1147 if (amountToAdd instanceof Period) { 1148 Period periodToAdd = (Period) amountToAdd; 1149 return with(date.plus(periodToAdd), time); 1150 } 1151 Objects.requireNonNull(amountToAdd, "amountToAdd"); 1152 return (LocalDateTime) amountToAdd.addTo(this); 1153 } 1154 1155 /** 1156 * Returns a copy of this date-time with the specified amount added. 1157 * <p> 1158 * This returns a {@code LocalDateTime}, based on this one, with the amount 1159 * in terms of the unit added. If it is not possible to add the amount, because the 1160 * unit is not supported or for some other reason, an exception is thrown. 1161 * <p> 1162 * If the field is a {@link ChronoUnit} then the addition is implemented here. 1163 * Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}. 1164 * Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with 1165 * any overflow in days added equivalent to using {@link #plusDays(long)}. 1166 * <p> 1167 * If the field is not a {@code ChronoUnit}, then the result of this method 1168 * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)} 1169 * passing {@code this} as the argument. In this case, the unit determines 1170 * whether and how to perform the addition. 1171 * <p> 1172 * This instance is immutable and unaffected by this method call. 1173 * 1174 * @param amountToAdd the amount of the unit to add to the result, may be negative 1175 * @param unit the unit of the amount to add, not null 1176 * @return a {@code LocalDateTime} based on this date-time with the specified amount added, not null 1177 * @throws DateTimeException if the addition cannot be made 1178 * @throws UnsupportedTemporalTypeException if the unit is not supported 1179 * @throws ArithmeticException if numeric overflow occurs 1180 */ 1181 @Override 1182 public LocalDateTime plus(long amountToAdd, TemporalUnit unit) { 1183 if (unit instanceof ChronoUnit) { 1184 ChronoUnit f = (ChronoUnit) unit; 1185 switch (f) { 1186 case NANOS: return plusNanos(amountToAdd); 1187 case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000); 1188 case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000); 1189 case SECONDS: return plusSeconds(amountToAdd); 1190 case MINUTES: return plusMinutes(amountToAdd); 1191 case HOURS: return plusHours(amountToAdd); 1192 case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12); // no overflow (256 is multiple of 2) 1193 } 1194 return with(date.plus(amountToAdd, unit), time); 1195 } 1196 return unit.addTo(this, amountToAdd); 1197 } 1198 1199 //----------------------------------------------------------------------- 1200 /** 1201 * Returns a copy of this {@code LocalDateTime} with the specified number of years added. 1202 * <p> 1203 * This method adds the specified amount to the years field in three steps: 1204 * <ol> 1205 * <li>Add the input years to the year field</li> 1206 * <li>Check if the resulting date would be invalid</li> 1207 * <li>Adjust the day-of-month to the last valid day if necessary</li> 1208 * </ol> 1209 * <p> 1210 * For example, 2008-02-29 (leap year) plus one year would result in the 1211 * invalid date 2009-02-29 (standard year). Instead of returning an invalid 1212 * result, the last valid day of the month, 2009-02-28, is selected instead. 1213 * <p> 1214 * This instance is immutable and unaffected by this method call. 1215 * 1216 * @param years the years to add, may be negative 1217 * @return a {@code LocalDateTime} based on this date-time with the years added, not null 1218 * @throws DateTimeException if the result exceeds the supported date range 1219 */ 1220 public LocalDateTime plusYears(long years) { 1221 LocalDate newDate = date.plusYears(years); 1222 return with(newDate, time); 1223 } 1224 1225 /** 1226 * Returns a copy of this {@code LocalDateTime} with the specified number of months added. 1227 * <p> 1228 * This method adds the specified amount to the months field in three steps: 1229 * <ol> 1230 * <li>Add the input months to the month-of-year field</li> 1231 * <li>Check if the resulting date would be invalid</li> 1232 * <li>Adjust the day-of-month to the last valid day if necessary</li> 1233 * </ol> 1234 * <p> 1235 * For example, 2007-03-31 plus one month would result in the invalid date 1236 * 2007-04-31. Instead of returning an invalid result, the last valid day 1237 * of the month, 2007-04-30, is selected instead. 1238 * <p> 1239 * This instance is immutable and unaffected by this method call. 1240 * 1241 * @param months the months to add, may be negative 1242 * @return a {@code LocalDateTime} based on this date-time with the months added, not null 1243 * @throws DateTimeException if the result exceeds the supported date range 1244 */ 1245 public LocalDateTime plusMonths(long months) { 1246 LocalDate newDate = date.plusMonths(months); 1247 return with(newDate, time); 1248 } 1249 1250 /** 1251 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks added. 1252 * <p> 1253 * This method adds the specified amount in weeks to the days field incrementing 1254 * the month and year fields as necessary to ensure the result remains valid. 1255 * The result is only invalid if the maximum/minimum year is exceeded. 1256 * <p> 1257 * For example, 2008-12-31 plus one week would result in 2009-01-07. 1258 * <p> 1259 * This instance is immutable and unaffected by this method call. 1260 * 1261 * @param weeks the weeks to add, may be negative 1262 * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null 1263 * @throws DateTimeException if the result exceeds the supported date range 1264 */ 1265 public LocalDateTime plusWeeks(long weeks) { 1266 LocalDate newDate = date.plusWeeks(weeks); 1267 return with(newDate, time); 1268 } 1269 1270 /** 1271 * Returns a copy of this {@code LocalDateTime} with the specified number of days added. 1272 * <p> 1273 * This method adds the specified amount to the days field incrementing the 1274 * month and year fields as necessary to ensure the result remains valid. 1275 * The result is only invalid if the maximum/minimum year is exceeded. 1276 * <p> 1277 * For example, 2008-12-31 plus one day would result in 2009-01-01. 1278 * <p> 1279 * This instance is immutable and unaffected by this method call. 1280 * 1281 * @param days the days to add, may be negative 1282 * @return a {@code LocalDateTime} based on this date-time with the days added, not null 1283 * @throws DateTimeException if the result exceeds the supported date range 1284 */ 1285 public LocalDateTime plusDays(long days) { 1286 LocalDate newDate = date.plusDays(days); 1287 return with(newDate, time); 1288 } 1289 1290 //----------------------------------------------------------------------- 1291 /** 1292 * Returns a copy of this {@code LocalDateTime} with the specified number of hours added. 1293 * <p> 1294 * This instance is immutable and unaffected by this method call. 1295 * 1296 * @param hours the hours to add, may be negative 1297 * @return a {@code LocalDateTime} based on this date-time with the hours added, not null 1298 * @throws DateTimeException if the result exceeds the supported date range 1299 */ 1300 public LocalDateTime plusHours(long hours) { 1301 return plusWithOverflow(date, hours, 0, 0, 0, 1); 1302 } 1303 1304 /** 1305 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes added. 1306 * <p> 1307 * This instance is immutable and unaffected by this method call. 1308 * 1309 * @param minutes the minutes to add, may be negative 1310 * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null 1311 * @throws DateTimeException if the result exceeds the supported date range 1312 */ 1313 public LocalDateTime plusMinutes(long minutes) { 1314 return plusWithOverflow(date, 0, minutes, 0, 0, 1); 1315 } 1316 1317 /** 1318 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds added. 1319 * <p> 1320 * This instance is immutable and unaffected by this method call. 1321 * 1322 * @param seconds the seconds to add, may be negative 1323 * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null 1324 * @throws DateTimeException if the result exceeds the supported date range 1325 */ 1326 public LocalDateTime plusSeconds(long seconds) { 1327 return plusWithOverflow(date, 0, 0, seconds, 0, 1); 1328 } 1329 1330 /** 1331 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds added. 1332 * <p> 1333 * This instance is immutable and unaffected by this method call. 1334 * 1335 * @param nanos the nanos to add, may be negative 1336 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null 1337 * @throws DateTimeException if the result exceeds the supported date range 1338 */ 1339 public LocalDateTime plusNanos(long nanos) { 1340 return plusWithOverflow(date, 0, 0, 0, nanos, 1); 1341 } 1342 1343 //----------------------------------------------------------------------- 1344 /** 1345 * Returns a copy of this date-time with the specified amount subtracted. 1346 * <p> 1347 * This returns a {@code LocalDateTime}, based on this one, with the specified amount subtracted. 1348 * The amount is typically {@link Period} or {@link Duration} but may be 1349 * any other type implementing the {@link TemporalAmount} interface. 1350 * <p> 1351 * The calculation is delegated to the amount object by calling 1352 * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free 1353 * to implement the subtraction in any way it wishes, however it typically 1354 * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation 1355 * of the amount implementation to determine if it can be successfully subtracted. 1356 * <p> 1357 * This instance is immutable and unaffected by this method call. 1358 * 1359 * @param amountToSubtract the amount to subtract, not null 1360 * @return a {@code LocalDateTime} based on this date-time with the subtraction made, not null 1361 * @throws DateTimeException if the subtraction cannot be made 1362 * @throws ArithmeticException if numeric overflow occurs 1363 */ 1364 @Override 1365 public LocalDateTime minus(TemporalAmount amountToSubtract) { 1366 if (amountToSubtract instanceof Period) { 1367 Period periodToSubtract = (Period) amountToSubtract; 1368 return with(date.minus(periodToSubtract), time); 1369 } 1370 Objects.requireNonNull(amountToSubtract, "amountToSubtract"); 1371 return (LocalDateTime) amountToSubtract.subtractFrom(this); 1372 } 1373 1374 /** 1375 * Returns a copy of this date-time with the specified amount subtracted. 1376 * <p> 1377 * This returns a {@code LocalDateTime}, based on this one, with the amount 1378 * in terms of the unit subtracted. If it is not possible to subtract the amount, 1379 * because the unit is not supported or for some other reason, an exception is thrown. 1380 * <p> 1381 * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated. 1382 * See that method for a full description of how addition, and thus subtraction, works. 1383 * <p> 1384 * This instance is immutable and unaffected by this method call. 1385 * 1386 * @param amountToSubtract the amount of the unit to subtract from the result, may be negative 1387 * @param unit the unit of the amount to subtract, not null 1388 * @return a {@code LocalDateTime} based on this date-time with the specified amount subtracted, not null 1389 * @throws DateTimeException if the subtraction cannot be made 1390 * @throws UnsupportedTemporalTypeException if the unit is not supported 1391 * @throws ArithmeticException if numeric overflow occurs 1392 */ 1393 @Override 1394 public LocalDateTime minus(long amountToSubtract, TemporalUnit unit) { 1395 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit)); 1396 } 1397 1398 //----------------------------------------------------------------------- 1399 /** 1400 * Returns a copy of this {@code LocalDateTime} with the specified number of years subtracted. 1401 * <p> 1402 * This method subtracts the specified amount from the years field in three steps: 1403 * <ol> 1404 * <li>Subtract the input years from the year field</li> 1405 * <li>Check if the resulting date would be invalid</li> 1406 * <li>Adjust the day-of-month to the last valid day if necessary</li> 1407 * </ol> 1408 * <p> 1409 * For example, 2008-02-29 (leap year) minus one year would result in the 1410 * invalid date 2007-02-29 (standard year). Instead of returning an invalid 1411 * result, the last valid day of the month, 2007-02-28, is selected instead. 1412 * <p> 1413 * This instance is immutable and unaffected by this method call. 1414 * 1415 * @param years the years to subtract, may be negative 1416 * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null 1417 * @throws DateTimeException if the result exceeds the supported date range 1418 */ 1419 public LocalDateTime minusYears(long years) { 1420 return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years)); 1421 } 1422 1423 /** 1424 * Returns a copy of this {@code LocalDateTime} with the specified number of months subtracted. 1425 * <p> 1426 * This method subtracts the specified amount from the months field in three steps: 1427 * <ol> 1428 * <li>Subtract the input months from the month-of-year field</li> 1429 * <li>Check if the resulting date would be invalid</li> 1430 * <li>Adjust the day-of-month to the last valid day if necessary</li> 1431 * </ol> 1432 * <p> 1433 * For example, 2007-03-31 minus one month would result in the invalid date 1434 * 2007-02-31. Instead of returning an invalid result, the last valid day 1435 * of the month, 2007-02-28, is selected instead. 1436 * <p> 1437 * This instance is immutable and unaffected by this method call. 1438 * 1439 * @param months the months to subtract, may be negative 1440 * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null 1441 * @throws DateTimeException if the result exceeds the supported date range 1442 */ 1443 public LocalDateTime minusMonths(long months) { 1444 return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months)); 1445 } 1446 1447 /** 1448 * Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted. 1449 * <p> 1450 * This method subtracts the specified amount in weeks from the days field decrementing 1451 * the month and year fields as necessary to ensure the result remains valid. 1452 * The result is only invalid if the maximum/minimum year is exceeded. 1453 * <p> 1454 * For example, 2009-01-07 minus one week would result in 2008-12-31. 1455 * <p> 1456 * This instance is immutable and unaffected by this method call. 1457 * 1458 * @param weeks the weeks to subtract, may be negative 1459 * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null 1460 * @throws DateTimeException if the result exceeds the supported date range 1461 */ 1462 public LocalDateTime minusWeeks(long weeks) { 1463 return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks)); 1464 } 1465 1466 /** 1467 * Returns a copy of this {@code LocalDateTime} with the specified number of days subtracted. 1468 * <p> 1469 * This method subtracts the specified amount from the days field decrementing the 1470 * month and year fields as necessary to ensure the result remains valid. 1471 * The result is only invalid if the maximum/minimum year is exceeded. 1472 * <p> 1473 * For example, 2009-01-01 minus one day would result in 2008-12-31. 1474 * <p> 1475 * This instance is immutable and unaffected by this method call. 1476 * 1477 * @param days the days to subtract, may be negative 1478 * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null 1479 * @throws DateTimeException if the result exceeds the supported date range 1480 */ 1481 public LocalDateTime minusDays(long days) { 1482 return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days)); 1483 } 1484 1485 //----------------------------------------------------------------------- 1486 /** 1487 * Returns a copy of this {@code LocalDateTime} with the specified number of hours subtracted. 1488 * <p> 1489 * This instance is immutable and unaffected by this method call. 1490 * 1491 * @param hours the hours to subtract, may be negative 1492 * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null 1493 * @throws DateTimeException if the result exceeds the supported date range 1494 */ 1495 public LocalDateTime minusHours(long hours) { 1496 return plusWithOverflow(date, hours, 0, 0, 0, -1); 1497 } 1498 1499 /** 1500 * Returns a copy of this {@code LocalDateTime} with the specified number of minutes subtracted. 1501 * <p> 1502 * This instance is immutable and unaffected by this method call. 1503 * 1504 * @param minutes the minutes to subtract, may be negative 1505 * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null 1506 * @throws DateTimeException if the result exceeds the supported date range 1507 */ 1508 public LocalDateTime minusMinutes(long minutes) { 1509 return plusWithOverflow(date, 0, minutes, 0, 0, -1); 1510 } 1511 1512 /** 1513 * Returns a copy of this {@code LocalDateTime} with the specified number of seconds subtracted. 1514 * <p> 1515 * This instance is immutable and unaffected by this method call. 1516 * 1517 * @param seconds the seconds to subtract, may be negative 1518 * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null 1519 * @throws DateTimeException if the result exceeds the supported date range 1520 */ 1521 public LocalDateTime minusSeconds(long seconds) { 1522 return plusWithOverflow(date, 0, 0, seconds, 0, -1); 1523 } 1524 1525 /** 1526 * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds subtracted. 1527 * <p> 1528 * This instance is immutable and unaffected by this method call. 1529 * 1530 * @param nanos the nanos to subtract, may be negative 1531 * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null 1532 * @throws DateTimeException if the result exceeds the supported date range 1533 */ 1534 public LocalDateTime minusNanos(long nanos) { 1535 return plusWithOverflow(date, 0, 0, 0, nanos, -1); 1536 } 1537 1538 //----------------------------------------------------------------------- 1539 /** 1540 * Returns a copy of this {@code LocalDateTime} with the specified period added. 1541 * <p> 1542 * This instance is immutable and unaffected by this method call. 1543 * 1544 * @param newDate the new date to base the calculation on, not null 1545 * @param hours the hours to add, may be negative 1546 * @param minutes the minutes to add, may be negative 1547 * @param seconds the seconds to add, may be negative 1548 * @param nanos the nanos to add, may be negative 1549 * @param sign the sign to determine add or subtract 1550 * @return the combined result, not null 1551 */ 1552 private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) { 1553 // 9223372036854775808 long, 2147483648 int 1554 if ((hours | minutes | seconds | nanos) == 0) { 1555 return with(newDate, time); 1556 } 1557 long totDays = nanos / NANOS_PER_DAY + // max/24*60*60*1B 1558 seconds / SECONDS_PER_DAY + // max/24*60*60 1559 minutes / MINUTES_PER_DAY + // max/24*60 1560 hours / HOURS_PER_DAY; // max/24 1561 totDays *= sign; // total max*0.4237... 1562 long totNanos = nanos % NANOS_PER_DAY + // max 86400000000000 1563 (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND + // max 86400000000000 1564 (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE + // max 86400000000000 1565 (hours % HOURS_PER_DAY) * NANOS_PER_HOUR; // max 86400000000000 1566 long curNoD = time.toNanoOfDay(); // max 86400000000000 1567 totNanos = totNanos * sign + curNoD; // total 432000000000000 1568 totDays += Math.floorDiv(totNanos, NANOS_PER_DAY); 1569 long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY); 1570 LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD)); 1571 return with(newDate.plusDays(totDays), newTime); 1572 } 1573 1574 //----------------------------------------------------------------------- 1575 /** 1576 * Queries this date-time using the specified query. 1577 * <p> 1578 * This queries this date-time using the specified query strategy object. 1579 * The {@code TemporalQuery} object defines the logic to be used to 1580 * obtain the result. Read the documentation of the query to understand 1581 * what the result of this method will be. 1582 * <p> 1583 * The result of this method is obtained by invoking the 1584 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the 1585 * specified query passing {@code this} as the argument. 1586 * 1587 * @param <R> the type of the result 1588 * @param query the query to invoke, not null 1589 * @return the query result, null may be returned (defined by the query) 1590 * @throws DateTimeException if unable to query (defined by the query) 1591 * @throws ArithmeticException if numeric overflow occurs (defined by the query) 1592 */ 1593 @SuppressWarnings("unchecked") 1594 @Override // override for Javadoc 1595 public <R> R query(TemporalQuery<R> query) { 1596 if (query == TemporalQueries.localDate()) { 1597 return (R) date; 1598 } 1599 return ChronoLocalDateTime.super.query(query); 1600 } 1601 1602 /** 1603 * Adjusts the specified temporal object to have the same date and time as this object. 1604 * <p> 1605 * This returns a temporal object of the same observable type as the input 1606 * with the date and time changed to be the same as this. 1607 * <p> 1608 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)} 1609 * twice, passing {@link ChronoField#EPOCH_DAY} and 1610 * {@link ChronoField#NANO_OF_DAY} as the fields. 1611 * <p> 1612 * In most cases, it is clearer to reverse the calling pattern by using 1613 * {@link Temporal#with(TemporalAdjuster)}: 1614 * <pre> 1615 * // these two lines are equivalent, but the second approach is recommended 1616 * temporal = thisLocalDateTime.adjustInto(temporal); 1617 * temporal = temporal.with(thisLocalDateTime); 1618 * </pre> 1619 * <p> 1620 * This instance is immutable and unaffected by this method call. 1621 * 1622 * @param temporal the target object to be adjusted, not null 1623 * @return the adjusted object, not null 1624 * @throws DateTimeException if unable to make the adjustment 1625 * @throws ArithmeticException if numeric overflow occurs 1626 */ 1627 @Override // override for Javadoc 1628 public Temporal adjustInto(Temporal temporal) { 1629 return ChronoLocalDateTime.super.adjustInto(temporal); 1630 } 1631 1632 /** 1633 * Calculates the amount of time until another date-time in terms of the specified unit. 1634 * <p> 1635 * This calculates the amount of time between two {@code LocalDateTime} 1636 * objects in terms of a single {@code TemporalUnit}. 1637 * The start and end points are {@code this} and the specified date-time. 1638 * The result will be negative if the end is before the start. 1639 * The {@code Temporal} passed to this method is converted to a 1640 * {@code LocalDateTime} using {@link #from(TemporalAccessor)}. 1641 * For example, the amount in days between two date-times can be calculated 1642 * using {@code startDateTime.until(endDateTime, DAYS)}. 1643 * <p> 1644 * The calculation returns a whole number, representing the number of 1645 * complete units between the two date-times. 1646 * For example, the amount in months between 2012-06-15T00:00 and 2012-08-14T23:59 1647 * will only be one month as it is one minute short of two months. 1648 * <p> 1649 * There are two equivalent ways of using this method. 1650 * The first is to invoke this method. 1651 * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}: 1652 * <pre> 1653 * // these two lines are equivalent 1654 * amount = start.until(end, MONTHS); 1655 * amount = MONTHS.between(start, end); 1656 * </pre> 1657 * The choice should be made based on which makes the code more readable. 1658 * <p> 1659 * The calculation is implemented in this method for {@link ChronoUnit}. 1660 * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS}, 1661 * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS}, 1662 * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES}, 1663 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported. 1664 * Other {@code ChronoUnit} values will throw an exception. 1665 * <p> 1666 * If the unit is not a {@code ChronoUnit}, then the result of this method 1667 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)} 1668 * passing {@code this} as the first argument and the converted input temporal 1669 * as the second argument. 1670 * <p> 1671 * This instance is immutable and unaffected by this method call. 1672 * 1673 * @param endExclusive the end date, exclusive, which is converted to a {@code LocalDateTime}, not null 1674 * @param unit the unit to measure the amount in, not null 1675 * @return the amount of time between this date-time and the end date-time 1676 * @throws DateTimeException if the amount cannot be calculated, or the end 1677 * temporal cannot be converted to a {@code LocalDateTime} 1678 * @throws UnsupportedTemporalTypeException if the unit is not supported 1679 * @throws ArithmeticException if numeric overflow occurs 1680 */ 1681 @Override 1682 public long until(Temporal endExclusive, TemporalUnit unit) { 1683 LocalDateTime end = LocalDateTime.from(endExclusive); 1684 if (unit instanceof ChronoUnit) { 1685 if (unit.isTimeBased()) { 1686 long amount = date.daysUntil(end.date); 1687 if (amount == 0) { 1688 return time.until(end.time, unit); 1689 } 1690 long timePart = end.time.toNanoOfDay() - time.toNanoOfDay(); 1691 if (amount > 0) { 1692 amount--; // safe 1693 timePart += NANOS_PER_DAY; // safe 1694 } else { 1695 amount++; // safe 1696 timePart -= NANOS_PER_DAY; // safe 1697 } 1698 switch ((ChronoUnit) unit) { 1699 case NANOS: 1700 amount = Math.multiplyExact(amount, NANOS_PER_DAY); 1701 break; 1702 case MICROS: 1703 amount = Math.multiplyExact(amount, MICROS_PER_DAY); 1704 timePart = timePart / 1000; 1705 break; 1706 case MILLIS: 1707 amount = Math.multiplyExact(amount, MILLIS_PER_DAY); 1708 timePart = timePart / 1_000_000; 1709 break; 1710 case SECONDS: 1711 amount = Math.multiplyExact(amount, SECONDS_PER_DAY); 1712 timePart = timePart / NANOS_PER_SECOND; 1713 break; 1714 case MINUTES: 1715 amount = Math.multiplyExact(amount, MINUTES_PER_DAY); 1716 timePart = timePart / NANOS_PER_MINUTE; 1717 break; 1718 case HOURS: 1719 amount = Math.multiplyExact(amount, HOURS_PER_DAY); 1720 timePart = timePart / NANOS_PER_HOUR; 1721 break; 1722 case HALF_DAYS: 1723 amount = Math.multiplyExact(amount, 2); 1724 timePart = timePart / (NANOS_PER_HOUR * 12); 1725 break; 1726 } 1727 return Math.addExact(amount, timePart); 1728 } 1729 LocalDate endDate = end.date; 1730 if (endDate.isAfter(date) && end.time.isBefore(time)) { 1731 endDate = endDate.minusDays(1); 1732 } else if (endDate.isBefore(date) && end.time.isAfter(time)) { 1733 endDate = endDate.plusDays(1); 1734 } 1735 return date.until(endDate, unit); 1736 } 1737 return unit.between(this, end); 1738 } 1739 1740 /** 1741 * Formats this date-time using the specified formatter. 1742 * <p> 1743 * This date-time will be passed to the formatter to produce a string. 1744 * 1745 * @param formatter the formatter to use, not null 1746 * @return the formatted date-time string, not null 1747 * @throws DateTimeException if an error occurs during printing 1748 */ 1749 @Override // override for Javadoc and performance 1750 public String format(DateTimeFormatter formatter) { 1751 Objects.requireNonNull(formatter, "formatter"); 1752 return formatter.format(this); 1753 } 1754 1755 //----------------------------------------------------------------------- 1756 /** 1757 * Combines this date-time with an offset to create an {@code OffsetDateTime}. 1758 * <p> 1759 * This returns an {@code OffsetDateTime} formed from this date-time at the specified offset. 1760 * All possible combinations of date-time and offset are valid. 1761 * 1762 * @param offset the offset to combine with, not null 1763 * @return the offset date-time formed from this date-time and the specified offset, not null 1764 */ 1765 public OffsetDateTime atOffset(ZoneOffset offset) { 1766 return OffsetDateTime.of(this, offset); 1767 } 1768 1769 /** 1770 * Combines this date-time with a time-zone to create a {@code ZonedDateTime}. 1771 * <p> 1772 * This returns a {@code ZonedDateTime} formed from this date-time at the 1773 * specified time-zone. The result will match this date-time as closely as possible. 1774 * Time-zone rules, such as daylight savings, mean that not every local date-time 1775 * is valid for the specified zone, thus the local date-time may be adjusted. 1776 * <p> 1777 * The local date-time is resolved to a single instant on the time-line. 1778 * This is achieved by finding a valid offset from UTC/Greenwich for the local 1779 * date-time as defined by the {@link ZoneRules rules} of the zone ID. 1780 *<p> 1781 * In most cases, there is only one valid offset for a local date-time. 1782 * In the case of an overlap, where clocks are set back, there are two valid offsets. 1783 * This method uses the earlier offset typically corresponding to "summer". 1784 * <p> 1785 * In the case of a gap, where clocks jump forward, there is no valid offset. 1786 * Instead, the local date-time is adjusted to be later by the length of the gap. 1787 * For a typical one hour daylight savings change, the local date-time will be 1788 * moved one hour later into the offset typically corresponding to "summer". 1789 * <p> 1790 * To obtain the later offset during an overlap, call 1791 * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method. 1792 * To throw an exception when there is a gap or overlap, use 1793 * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}. 1794 * 1795 * @param zone the time-zone to use, not null 1796 * @return the zoned date-time formed from this date-time, not null 1797 */ 1798 @Override 1799 public ZonedDateTime atZone(ZoneId zone) { 1800 return ZonedDateTime.of(this, zone); 1801 } 1802 1803 //----------------------------------------------------------------------- 1804 /** 1805 * Compares this date-time to another date-time. 1806 * <p> 1807 * The comparison is primarily based on the date-time, from earliest to latest. 1808 * It is "consistent with equals", as defined by {@link Comparable}. 1809 * <p> 1810 * If all the date-times being compared are instances of {@code LocalDateTime}, 1811 * then the comparison will be entirely based on the date-time. 1812 * If some dates being compared are in different chronologies, then the 1813 * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}. 1814 * 1815 * @param other the other date-time to compare to, not null 1816 * @return the comparator value, negative if less, positive if greater 1817 */ 1818 @Override // override for Javadoc and performance 1819 public int compareTo(ChronoLocalDateTime<?> other) { 1820 if (other instanceof LocalDateTime) { 1821 return compareTo0((LocalDateTime) other); 1822 } 1823 return ChronoLocalDateTime.super.compareTo(other); 1824 } 1825 1826 private int compareTo0(LocalDateTime other) { 1827 int cmp = date.compareTo0(other.toLocalDate()); 1828 if (cmp == 0) { 1829 cmp = time.compareTo(other.toLocalTime()); 1830 } 1831 return cmp; 1832 } 1833 1834 /** 1835 * Checks if this date-time is after the specified date-time. 1836 * <p> 1837 * This checks to see if this date-time represents a point on the 1838 * local time-line after the other date-time. 1839 * <pre> 1840 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00); 1841 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00); 1842 * a.isAfter(b) == false 1843 * a.isAfter(a) == false 1844 * b.isAfter(a) == true 1845 * </pre> 1846 * <p> 1847 * This method only considers the position of the two date-times on the local time-line. 1848 * It does not take into account the chronology, or calendar system. 1849 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)}, 1850 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}. 1851 * 1852 * @param other the other date-time to compare to, not null 1853 * @return true if this date-time is after the specified date-time 1854 */ 1855 @Override // override for Javadoc and performance 1856 public boolean isAfter(ChronoLocalDateTime<?> other) { 1857 if (other instanceof LocalDateTime) { 1858 return compareTo0((LocalDateTime) other) > 0; 1859 } 1860 return ChronoLocalDateTime.super.isAfter(other); 1861 } 1862 1863 /** 1864 * Checks if this date-time is before the specified date-time. 1865 * <p> 1866 * This checks to see if this date-time represents a point on the 1867 * local time-line before the other date-time. 1868 * <pre> 1869 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00); 1870 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00); 1871 * a.isBefore(b) == true 1872 * a.isBefore(a) == false 1873 * b.isBefore(a) == false 1874 * </pre> 1875 * <p> 1876 * This method only considers the position of the two date-times on the local time-line. 1877 * It does not take into account the chronology, or calendar system. 1878 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)}, 1879 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}. 1880 * 1881 * @param other the other date-time to compare to, not null 1882 * @return true if this date-time is before the specified date-time 1883 */ 1884 @Override // override for Javadoc and performance 1885 public boolean isBefore(ChronoLocalDateTime<?> other) { 1886 if (other instanceof LocalDateTime) { 1887 return compareTo0((LocalDateTime) other) < 0; 1888 } 1889 return ChronoLocalDateTime.super.isBefore(other); 1890 } 1891 1892 /** 1893 * Checks if this date-time is equal to the specified date-time. 1894 * <p> 1895 * This checks to see if this date-time represents the same point on the 1896 * local time-line as the other date-time. 1897 * <pre> 1898 * LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00); 1899 * LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00); 1900 * a.isEqual(b) == false 1901 * a.isEqual(a) == true 1902 * b.isEqual(a) == false 1903 * </pre> 1904 * <p> 1905 * This method only considers the position of the two date-times on the local time-line. 1906 * It does not take into account the chronology, or calendar system. 1907 * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)}, 1908 * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}. 1909 * 1910 * @param other the other date-time to compare to, not null 1911 * @return true if this date-time is equal to the specified date-time 1912 */ 1913 @Override // override for Javadoc and performance 1914 public boolean isEqual(ChronoLocalDateTime<?> other) { 1915 if (other instanceof LocalDateTime) { 1916 return compareTo0((LocalDateTime) other) == 0; 1917 } 1918 return ChronoLocalDateTime.super.isEqual(other); 1919 } 1920 1921 //----------------------------------------------------------------------- 1922 /** 1923 * Checks if this date-time is equal to another date-time. 1924 * <p> 1925 * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same. 1926 * Only objects of type {@code LocalDateTime} are compared, other types return false. 1927 * 1928 * @param obj the object to check, null returns false 1929 * @return true if this is equal to the other date-time 1930 */ 1931 @Override 1932 public boolean equals(Object obj) { 1933 if (this == obj) { 1934 return true; 1935 } 1936 if (obj instanceof LocalDateTime) { 1937 LocalDateTime other = (LocalDateTime) obj; 1938 return date.equals(other.date) && time.equals(other.time); 1939 } 1940 return false; 1941 } 1942 1943 /** 1944 * A hash code for this date-time. 1945 * 1946 * @return a suitable hash code 1947 */ 1948 @Override 1949 public int hashCode() { 1950 return date.hashCode() ^ time.hashCode(); 1951 } 1952 1953 //----------------------------------------------------------------------- 1954 /** 1955 * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}. 1956 * <p> 1957 * The output will be one of the following ISO-8601 formats: 1958 * <ul> 1959 * <li>{@code uuuu-MM-dd'T'HH:mm}</li> 1960 * <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li> 1961 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li> 1962 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li> 1963 * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li> 1964 * </ul> 1965 * The format used will be the shortest that outputs the full value of 1966 * the time where the omitted parts are implied to be zero. 1967 * 1968 * @return a string representation of this date-time, not null 1969 */ 1970 @Override 1971 public String toString() { 1972 return date.toString() + 'T' + time.toString(); 1973 } 1974 1975 //----------------------------------------------------------------------- 1976 /** 1977 * Writes the object using a 1978 * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>. 1979 * @serialData 1980 * <pre> 1981 * out.writeByte(5); // identifies a LocalDateTime 1982 * // the <a href="../../serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header 1983 * // the <a href="../../serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header 1984 * </pre> 1985 * 1986 * @return the instance of {@code Ser}, not null 1987 */ 1988 private Object writeReplace() { 1989 return new Ser(Ser.LOCAL_DATE_TIME_TYPE, this); 1990 } 1991 1992 /** 1993 * Defend against malicious streams. 1994 * 1995 * @param s the stream to read 1996 * @throws InvalidObjectException always 1997 */ 1998 private void readObject(ObjectInputStream s) throws InvalidObjectException { 1999 throw new InvalidObjectException("Deserialization via serialization delegate"); 2000 } 2001 2002 void writeExternal(DataOutput out) throws IOException { 2003 date.writeExternal(out); 2004 time.writeExternal(out); 2005 } 2006 2007 static LocalDateTime readExternal(DataInput in) throws IOException { 2008 LocalDate date = LocalDate.readExternal(in); 2009 LocalTime time = LocalTime.readExternal(in); 2010 return LocalDateTime.of(date, time); 2011 } 2012 2013 }