1 /*
2 * Copyright (c) 1994, 2018, 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 package java.util;
27
28 import java.text.DateFormat;
29 import java.time.LocalDate;
30 import java.io.IOException;
31 import java.io.ObjectOutputStream;
32 import java.io.ObjectInputStream;
33 import java.lang.ref.SoftReference;
34 import java.time.Instant;
35 import sun.util.calendar.BaseCalendar;
36 import sun.util.calendar.CalendarDate;
37 import sun.util.calendar.CalendarSystem;
38 import sun.util.calendar.CalendarUtils;
39 import sun.util.calendar.Era;
40 import sun.util.calendar.Gregorian;
41 import sun.util.calendar.ZoneInfo;
42
43 /**
44 * The class {@code Date} represents a specific instant
45 * in time, with millisecond precision.
46 * <p>
47 * Prior to JDK 1.1, the class {@code Date} had two additional
48 * functions. It allowed the interpretation of dates as year, month, day, hour,
49 * minute, and second values. It also allowed the formatting and parsing
50 * of date strings. Unfortunately, the API for these functions was not
51 * amenable to internationalization. As of JDK 1.1, the
52 * {@code Calendar} class should be used to convert between dates and time
53 * fields and the {@code DateFormat} class should be used to format and
54 * parse date strings.
55 * The corresponding methods in {@code Date} are deprecated.
56 * <p>
57 * Although the {@code Date} class is intended to reflect
58 * coordinated universal time (UTC), it may not do so exactly,
59 * depending on the host environment of the Java Virtual Machine.
60 * Nearly all modern operating systems assume that 1 day =
61 * 24 × 60 × 60 = 86400 seconds
62 * in all cases. In UTC, however, about once every year or two there
63 * is an extra second, called a "leap second." The leap
64 * second is always added as the last second of the day, and always
65 * on December 31 or June 30. For example, the last minute of the
66 * year 1995 was 61 seconds long, thanks to an added leap second.
67 * Most computer clocks are not accurate enough to be able to reflect
68 * the leap-second distinction.
69 * <p>
70 * Some computer standards are defined in terms of Greenwich mean
71 * time (GMT), which is equivalent to universal time (UT). GMT is
72 * the "civil" name for the standard; UT is the
73 * "scientific" name for the same standard. The
74 * distinction between UTC and UT is that UTC is based on an atomic
75 * clock and UT is based on astronomical observations, which for all
76 * practical purposes is an invisibly fine hair to split. Because the
77 * earth's rotation is not uniform (it slows down and speeds up
78 * in complicated ways), UT does not always flow uniformly. Leap
79 * seconds are introduced as needed into UTC so as to keep UTC within
80 * 0.9 seconds of UT1, which is a version of UT with certain
81 * corrections applied. There are other time and date systems as
82 * well; for example, the time scale used by the satellite-based
83 * global positioning system (GPS) is synchronized to UTC but is
84 * <i>not</i> adjusted for leap seconds. An interesting source of
85 * further information is the United States Naval Observatory (USNO):
86 * <blockquote><pre>
87 * <a href="https://www.usno.navy.mil/USNO">https://www.usno.navy.mil/USNO</a>
88 * </pre></blockquote>
89 * <p>
90 * and the material regarding "Systems of Time" at:
91 * <blockquote><pre>
92 * <a href="https://www.usno.navy.mil/USNO/time/master-clock/systems-of-time">https://www.usno.navy.mil/USNO/time/master-clock/systems-of-time</a>
93 * </pre></blockquote>
94 * <p>
95 * which has descriptions of various different time systems including
96 * UT, UT1, and UTC.
97 * <p>
98 * In all methods of class {@code Date} that accept or return
99 * year, month, date, hours, minutes, and seconds values, the
100 * following representations are used:
101 * <ul>
102 * <li>A year <i>y</i> is represented by the integer
103 * <i>y</i> {@code - 1900}.
104 * <li>A month is represented by an integer from 0 to 11; 0 is January,
105 * 1 is February, and so forth; thus 11 is December.
106 * <li>A date (day of month) is represented by an integer from 1 to 31
107 * in the usual manner.
108 * <li>An hour is represented by an integer from 0 to 23. Thus, the hour
109 * from midnight to 1 a.m. is hour 0, and the hour from noon to 1
110 * p.m. is hour 12.
111 * <li>A minute is represented by an integer from 0 to 59 in the usual manner.
112 * <li>A second is represented by an integer from 0 to 61; the values 60 and
113 * 61 occur only for leap seconds and even then only in Java
114 * implementations that actually track leap seconds correctly. Because
115 * of the manner in which leap seconds are currently introduced, it is
116 * extremely unlikely that two leap seconds will occur in the same
117 * minute, but this specification follows the date and time conventions
118 * for ISO C.
119 * </ul>
120 * <p>
121 * In all cases, arguments given to methods for these purposes need
122 * not fall within the indicated ranges; for example, a date may be
123 * specified as January 32 and is interpreted as meaning February 1.
124 *
125 * @author James Gosling
126 * @author Arthur van Hoff
127 * @author Alan Liu
128 * @see java.text.DateFormat
129 * @see java.util.Calendar
130 * @see java.util.TimeZone
131 * @since 1.0
132 */
133 public class Date
134 implements java.io.Serializable, Cloneable, Comparable<Date>
135 {
136 private static final BaseCalendar gcal =
137 CalendarSystem.getGregorianCalendar();
138 private static BaseCalendar jcal;
139
140 private transient long fastTime;
141
142 /*
143 * If cdate is null, then fastTime indicates the time in millis.
144 * If cdate.isNormalized() is true, then fastTime and cdate are in
145 * synch. Otherwise, fastTime is ignored, and cdate indicates the
146 * time.
147 */
148 private transient BaseCalendar.Date cdate;
149
150 // Initialized just before the value is used. See parse().
151 private static int defaultCenturyStart;
152
153 /* use serialVersionUID from modified java.util.Date for
154 * interoperability with JDK1.1. The Date was modified to write
155 * and read only the UTC time.
156 */
157 private static final long serialVersionUID = 7523967970034938905L;
158
159 /**
160 * Allocates a {@code Date} object and initializes it so that
161 * it represents the time at which it was allocated, measured to the
162 * nearest millisecond.
163 *
164 * @see java.lang.System#currentTimeMillis()
165 */
166 public Date() {
167 this(System.currentTimeMillis());
168 }
169
170 /**
171 * Allocates a {@code Date} object and initializes it to
172 * represent the specified number of milliseconds since the
173 * standard base time known as "the epoch", namely January 1,
174 * 1970, 00:00:00 GMT.
175 *
176 * @param date the milliseconds since January 1, 1970, 00:00:00 GMT.
177 * @see java.lang.System#currentTimeMillis()
178 */
179 public Date(long date) {
180 fastTime = date;
181 }
182
183 /**
184 * Allocates a {@code Date} object and initializes it so that
185 * it represents midnight, local time, at the beginning of the day
186 * specified by the {@code year}, {@code month}, and
187 * {@code date} arguments.
188 *
189 * @param year the year minus 1900.
190 * @param month the month between 0-11.
191 * @param date the day of the month between 1-31.
192 * @see java.util.Calendar
193 * @deprecated As of JDK version 1.1,
194 * replaced by {@code Calendar.set(year + 1900, month, date)}
195 * or {@code GregorianCalendar(year + 1900, month, date)}.
196 */
197 @Deprecated
198 public Date(int year, int month, int date) {
199 this(year, month, date, 0, 0, 0);
200 }
201
202 /**
203 * Allocates a {@code Date} object and initializes it so that
204 * it represents the instant at the start of the minute specified by
205 * the {@code year}, {@code month}, {@code date},
206 * {@code hrs}, and {@code min} arguments, in the local
207 * time zone.
208 *
209 * @param year the year minus 1900.
210 * @param month the month between 0-11.
211 * @param date the day of the month between 1-31.
212 * @param hrs the hours between 0-23.
213 * @param min the minutes between 0-59.
214 * @see java.util.Calendar
215 * @deprecated As of JDK version 1.1,
216 * replaced by {@code Calendar.set(year + 1900, month, date, hrs, min)}
217 * or {@code GregorianCalendar(year + 1900, month, date, hrs, min)}.
218 */
219 @Deprecated
220 public Date(int year, int month, int date, int hrs, int min) {
221 this(year, month, date, hrs, min, 0);
222 }
223
224 /**
225 * Allocates a {@code Date} object and initializes it so that
226 * it represents the instant at the start of the second specified
227 * by the {@code year}, {@code month}, {@code date},
228 * {@code hrs}, {@code min}, and {@code sec} arguments,
229 * in the local time zone.
230 *
231 * @param year the year minus 1900.
232 * @param month the month between 0-11.
233 * @param date the day of the month between 1-31.
234 * @param hrs the hours between 0-23.
235 * @param min the minutes between 0-59.
236 * @param sec the seconds between 0-59.
237 * @see java.util.Calendar
238 * @deprecated As of JDK version 1.1,
239 * replaced by {@code Calendar.set(year + 1900, month, date, hrs, min, sec)}
240 * or {@code GregorianCalendar(year + 1900, month, date, hrs, min, sec)}.
241 */
242 @Deprecated
243 public Date(int year, int month, int date, int hrs, int min, int sec) {
244 int y = year + 1900;
245 // month is 0-based. So we have to normalize month to support Long.MAX_VALUE.
246 if (month >= 12) {
247 y += month / 12;
248 month %= 12;
249 } else if (month < 0) {
250 y += CalendarUtils.floorDivide(month, 12);
251 month = CalendarUtils.mod(month, 12);
252 }
253 BaseCalendar cal = getCalendarSystem(y);
254 cdate = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.getDefaultRef());
255 cdate.setNormalizedDate(y, month + 1, date).setTimeOfDay(hrs, min, sec, 0);
256 getTimeImpl();
257 cdate = null;
258 }
259
260 /**
261 * Allocates a {@code Date} object and initializes it so that
262 * it represents the date and time indicated by the string
263 * {@code s}, which is interpreted as if by the
264 * {@link Date#parse} method.
265 *
266 * @param s a string representation of the date.
267 * @see java.text.DateFormat
268 * @see java.util.Date#parse(java.lang.String)
269 * @deprecated As of JDK version 1.1,
270 * replaced by {@code DateFormat.parse(String s)}.
271 */
272 @Deprecated
273 public Date(String s) {
274 this(parse(s));
275 }
276
277 /**
278 * Return a copy of this object.
279 */
280 public Object clone() {
281 Date d = null;
282 try {
283 d = (Date)super.clone();
284 if (cdate != null) {
285 d.cdate = (BaseCalendar.Date) cdate.clone();
286 }
287 } catch (CloneNotSupportedException e) {} // Won't happen
288 return d;
289 }
290
291 /**
292 * Determines the date and time based on the arguments. The
293 * arguments are interpreted as a year, month, day of the month,
294 * hour of the day, minute within the hour, and second within the
295 * minute, exactly as for the {@code Date} constructor with six
296 * arguments, except that the arguments are interpreted relative
297 * to UTC rather than to the local time zone. The time indicated is
298 * returned represented as the distance, measured in milliseconds,
299 * of that time from the epoch (00:00:00 GMT on January 1, 1970).
300 *
301 * @param year the year minus 1900.
302 * @param month the month between 0-11.
303 * @param date the day of the month between 1-31.
304 * @param hrs the hours between 0-23.
305 * @param min the minutes between 0-59.
306 * @param sec the seconds between 0-59.
307 * @return the number of milliseconds since January 1, 1970, 00:00:00 GMT for
308 * the date and time specified by the arguments.
309 * @see java.util.Calendar
310 * @deprecated As of JDK version 1.1,
311 * replaced by {@code Calendar.set(year + 1900, month, date, hrs, min, sec)}
312 * or {@code GregorianCalendar(year + 1900, month, date, hrs, min, sec)}, using a UTC
313 * {@code TimeZone}, followed by {@code Calendar.getTime().getTime()}.
314 */
315 @Deprecated
316 public static long UTC(int year, int month, int date,
317 int hrs, int min, int sec) {
318 int y = year + 1900;
319 // month is 0-based. So we have to normalize month to support Long.MAX_VALUE.
320 if (month >= 12) {
321 y += month / 12;
322 month %= 12;
323 } else if (month < 0) {
324 y += CalendarUtils.floorDivide(month, 12);
325 month = CalendarUtils.mod(month, 12);
326 }
327 int m = month + 1;
328 BaseCalendar cal = getCalendarSystem(y);
329 BaseCalendar.Date udate = (BaseCalendar.Date) cal.newCalendarDate(null);
330 udate.setNormalizedDate(y, m, date).setTimeOfDay(hrs, min, sec, 0);
331
332 // Use a Date instance to perform normalization. Its fastTime
333 // is the UTC value after the normalization.
334 Date d = new Date(0);
335 d.normalize(udate);
336 return d.fastTime;
337 }
338
339 /**
340 * Attempts to interpret the string {@code s} as a representation
341 * of a date and time. If the attempt is successful, the time
342 * indicated is returned represented as the distance, measured in
343 * milliseconds, of that time from the epoch (00:00:00 GMT on
344 * January 1, 1970). If the attempt fails, an
345 * {@code IllegalArgumentException} is thrown.
346 * <p>
347 * It accepts many syntaxes; in particular, it recognizes the IETF
348 * standard date syntax: "Sat, 12 Aug 1995 13:30:00 GMT". It also
349 * understands the continental U.S. time-zone abbreviations, but for
350 * general use, a time-zone offset should be used: "Sat, 12 Aug 1995
351 * 13:30:00 GMT+0430" (4 hours, 30 minutes west of the Greenwich
352 * meridian). If no time zone is specified, the local time zone is
353 * assumed. GMT and UTC are considered equivalent.
354 * <p>
355 * The string {@code s} is processed from left to right, looking for
356 * data of interest. Any material in {@code s} that is within the
357 * ASCII parenthesis characters {@code (} and {@code )} is ignored.
358 * Parentheses may be nested. Otherwise, the only characters permitted
359 * within {@code s} are these ASCII characters:
360 * <blockquote><pre>
361 * abcdefghijklmnopqrstuvwxyz
362 * ABCDEFGHIJKLMNOPQRSTUVWXYZ
363 * 0123456789,+-:/</pre></blockquote>
364 * and whitespace characters.<p>
365 * A consecutive sequence of decimal digits is treated as a decimal
366 * number:<ul>
367 * <li>If a number is preceded by {@code +} or {@code -} and a year
368 * has already been recognized, then the number is a time-zone
369 * offset. If the number is less than 24, it is an offset measured
370 * in hours. Otherwise, it is regarded as an offset in minutes,
371 * expressed in 24-hour time format without punctuation. A
372 * preceding {@code -} means a westward offset. Time zone offsets
373 * are always relative to UTC (Greenwich). Thus, for example,
374 * {@code -5} occurring in the string would mean "five hours west
375 * of Greenwich" and {@code +0430} would mean "four hours and
376 * thirty minutes east of Greenwich." It is permitted for the
377 * string to specify {@code GMT}, {@code UT}, or {@code UTC}
378 * redundantly-for example, {@code GMT-5} or {@code utc+0430}.
379 * <li>The number is regarded as a year number if one of the
380 * following conditions is true:
381 * <ul>
382 * <li>The number is equal to or greater than 70 and followed by a
383 * space, comma, slash, or end of string
384 * <li>The number is less than 70, and both a month and a day of
385 * the month have already been recognized</li>
386 * </ul>
387 * If the recognized year number is less than 100, it is
388 * interpreted as an abbreviated year relative to a century of
389 * which dates are within 80 years before and 19 years after
390 * the time when the Date class is initialized.
391 * After adjusting the year number, 1900 is subtracted from
392 * it. For example, if the current year is 1999 then years in
393 * the range 19 to 99 are assumed to mean 1919 to 1999, while
394 * years from 0 to 18 are assumed to mean 2000 to 2018. Note
395 * that this is slightly different from the interpretation of
396 * years less than 100 that is used in {@link java.text.SimpleDateFormat}.
397 * <li>If the number is followed by a colon, it is regarded as an hour,
398 * unless an hour has already been recognized, in which case it is
399 * regarded as a minute.
400 * <li>If the number is followed by a slash, it is regarded as a month
401 * (it is decreased by 1 to produce a number in the range {@code 0}
402 * to {@code 11}), unless a month has already been recognized, in
403 * which case it is regarded as a day of the month.
404 * <li>If the number is followed by whitespace, a comma, a hyphen, or
405 * end of string, then if an hour has been recognized but not a
406 * minute, it is regarded as a minute; otherwise, if a minute has
407 * been recognized but not a second, it is regarded as a second;
408 * otherwise, it is regarded as a day of the month. </ul><p>
409 * A consecutive sequence of letters is regarded as a word and treated
410 * as follows:<ul>
411 * <li>A word that matches {@code AM}, ignoring case, is ignored (but
412 * the parse fails if an hour has not been recognized or is less
413 * than {@code 1} or greater than {@code 12}).
414 * <li>A word that matches {@code PM}, ignoring case, adds {@code 12}
415 * to the hour (but the parse fails if an hour has not been
416 * recognized or is less than {@code 1} or greater than {@code 12}).
417 * <li>Any word that matches any prefix of {@code SUNDAY, MONDAY, TUESDAY,
418 * WEDNESDAY, THURSDAY, FRIDAY}, or {@code SATURDAY}, ignoring
419 * case, is ignored. For example, {@code sat, Friday, TUE}, and
420 * {@code Thurs} are ignored.
421 * <li>Otherwise, any word that matches any prefix of {@code JANUARY,
422 * FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER,
423 * OCTOBER, NOVEMBER}, or {@code DECEMBER}, ignoring case, and
424 * considering them in the order given here, is recognized as
425 * specifying a month and is converted to a number ({@code 0} to
426 * {@code 11}). For example, {@code aug, Sept, april}, and
427 * {@code NOV} are recognized as months. So is {@code Ma}, which
428 * is recognized as {@code MARCH}, not {@code MAY}.
429 * <li>Any word that matches {@code GMT, UT}, or {@code UTC}, ignoring
430 * case, is treated as referring to UTC.
431 * <li>Any word that matches {@code EST, CST, MST}, or {@code PST},
432 * ignoring case, is recognized as referring to the time zone in
433 * North America that is five, six, seven, or eight hours west of
434 * Greenwich, respectively. Any word that matches {@code EDT, CDT,
435 * MDT}, or {@code PDT}, ignoring case, is recognized as
436 * referring to the same time zone, respectively, during daylight
437 * saving time.</ul><p>
438 * Once the entire string s has been scanned, it is converted to a time
439 * result in one of two ways. If a time zone or time-zone offset has been
440 * recognized, then the year, month, day of month, hour, minute, and
441 * second are interpreted in UTC and then the time-zone offset is
442 * applied. Otherwise, the year, month, day of month, hour, minute, and
443 * second are interpreted in the local time zone.
444 *
445 * @param s a string to be parsed as a date.
446 * @return the number of milliseconds since January 1, 1970, 00:00:00 GMT
447 * represented by the string argument.
448 * @see java.text.DateFormat
449 * @deprecated As of JDK version 1.1,
450 * replaced by {@code DateFormat.parse(String s)}.
451 */
452 @Deprecated
453 public static long parse(String s) {
454 int year = Integer.MIN_VALUE;
455 int mon = -1;
456 int mday = -1;
457 int hour = -1;
458 int min = -1;
459 int sec = -1;
460 int millis = -1;
461 int c = -1;
462 int i = 0;
463 int n = -1;
464 int wst = -1;
465 int tzoffset = -1;
466 int prevc = 0;
467 syntax:
468 {
469 if (s == null)
470 break syntax;
471 int limit = s.length();
472 while (i < limit) {
473 c = s.charAt(i);
474 i++;
475 if (c <= ' ' || c == ',')
476 continue;
477 if (c == '(') { // skip comments
478 int depth = 1;
479 while (i < limit) {
480 c = s.charAt(i);
481 i++;
482 if (c == '(') depth++;
483 else if (c == ')')
484 if (--depth <= 0)
485 break;
486 }
487 continue;
488 }
489 if ('0' <= c && c <= '9') {
490 n = c - '0';
491 while (i < limit && '0' <= (c = s.charAt(i)) && c <= '9') {
492 n = n * 10 + c - '0';
493 i++;
494 }
495 if (prevc == '+' || prevc == '-' && year != Integer.MIN_VALUE) {
496 // timezone offset
497 if (n < 24)
498 n = n * 60; // EG. "GMT-3"
499 else
500 n = n % 100 + n / 100 * 60; // eg "GMT-0430"
501 if (prevc == '+') // plus means east of GMT
502 n = -n;
503 if (tzoffset != 0 && tzoffset != -1)
504 break syntax;
505 tzoffset = n;
506 } else if (n >= 70)
507 if (year != Integer.MIN_VALUE)
508 break syntax;
509 else if (c <= ' ' || c == ',' || c == '/' || i >= limit)
510 // year = n < 1900 ? n : n - 1900;
511 year = n;
512 else
513 break syntax;
514 else if (c == ':')
515 if (hour < 0)
516 hour = (byte) n;
517 else if (min < 0)
518 min = (byte) n;
519 else
520 break syntax;
521 else if (c == '/')
522 if (mon < 0)
523 mon = (byte) (n - 1);
524 else if (mday < 0)
525 mday = (byte) n;
526 else
527 break syntax;
528 else if (i < limit && c != ',' && c > ' ' && c != '-')
529 break syntax;
530 else if (hour >= 0 && min < 0)
531 min = (byte) n;
532 else if (min >= 0 && sec < 0)
533 sec = (byte) n;
534 else if (mday < 0)
535 mday = (byte) n;
536 // Handle two-digit years < 70 (70-99 handled above).
537 else if (year == Integer.MIN_VALUE && mon >= 0 && mday >= 0)
538 year = n;
539 else
540 break syntax;
541 prevc = 0;
542 } else if (c == '/' || c == ':' || c == '+' || c == '-')
543 prevc = c;
544 else {
545 int st = i - 1;
546 while (i < limit) {
547 c = s.charAt(i);
548 if (!('A' <= c && c <= 'Z' || 'a' <= c && c <= 'z'))
549 break;
550 i++;
551 }
552 if (i <= st + 1)
553 break syntax;
554 int k;
555 for (k = wtb.length; --k >= 0;)
556 if (wtb[k].regionMatches(true, 0, s, st, i - st)) {
557 int action = ttb[k];
558 if (action != 0) {
559 if (action == 1) { // pm
560 if (hour > 12 || hour < 1)
561 break syntax;
562 else if (hour < 12)
563 hour += 12;
564 } else if (action == 14) { // am
565 if (hour > 12 || hour < 1)
566 break syntax;
567 else if (hour == 12)
568 hour = 0;
569 } else if (action <= 13) { // month!
570 if (mon < 0)
571 mon = (byte) (action - 2);
572 else
573 break syntax;
574 } else {
575 tzoffset = action - 10000;
576 }
577 }
578 break;
579 }
580 if (k < 0)
581 break syntax;
582 prevc = 0;
583 }
584 }
585 if (year == Integer.MIN_VALUE || mon < 0 || mday < 0)
586 break syntax;
587 // Parse 2-digit years within the correct default century.
588 if (year < 100) {
589 synchronized (Date.class) {
590 if (defaultCenturyStart == 0) {
591 defaultCenturyStart = gcal.getCalendarDate().getYear() - 80;
592 }
593 }
594 year += (defaultCenturyStart / 100) * 100;
595 if (year < defaultCenturyStart) year += 100;
596 }
597 if (sec < 0)
598 sec = 0;
599 if (min < 0)
600 min = 0;
601 if (hour < 0)
602 hour = 0;
603 BaseCalendar cal = getCalendarSystem(year);
604 if (tzoffset == -1) { // no time zone specified, have to use local
605 BaseCalendar.Date ldate = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.getDefaultRef());
606 ldate.setDate(year, mon + 1, mday);
607 ldate.setTimeOfDay(hour, min, sec, 0);
608 return cal.getTime(ldate);
609 }
610 BaseCalendar.Date udate = (BaseCalendar.Date) cal.newCalendarDate(null); // no time zone
611 udate.setDate(year, mon + 1, mday);
612 udate.setTimeOfDay(hour, min, sec, 0);
613 return cal.getTime(udate) + tzoffset * (60 * 1000);
614 }
615 // syntax error
616 throw new IllegalArgumentException();
617 }
618 private static final String wtb[] = {
619 "am", "pm",
620 "monday", "tuesday", "wednesday", "thursday", "friday",
621 "saturday", "sunday",
622 "january", "february", "march", "april", "may", "june",
623 "july", "august", "september", "october", "november", "december",
624 "gmt", "ut", "utc", "est", "edt", "cst", "cdt",
625 "mst", "mdt", "pst", "pdt"
626 };
627 private static final int ttb[] = {
628 14, 1, 0, 0, 0, 0, 0, 0, 0,
629 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
630 10000 + 0, 10000 + 0, 10000 + 0, // GMT/UT/UTC
631 10000 + 5 * 60, 10000 + 4 * 60, // EST/EDT
632 10000 + 6 * 60, 10000 + 5 * 60, // CST/CDT
633 10000 + 7 * 60, 10000 + 6 * 60, // MST/MDT
634 10000 + 8 * 60, 10000 + 7 * 60 // PST/PDT
635 };
636
637 /**
638 * Returns a value that is the result of subtracting 1900 from the
639 * year that contains or begins with the instant in time represented
640 * by this {@code Date} object, as interpreted in the local
641 * time zone.
642 *
643 * @return the year represented by this date, minus 1900.
644 * @see java.util.Calendar
645 * @deprecated As of JDK version 1.1,
646 * replaced by {@code Calendar.get(Calendar.YEAR) - 1900}.
647 */
648 @Deprecated
649 public int getYear() {
650 return normalize().getYear() - 1900;
651 }
652
653 /**
654 * Sets the year of this {@code Date} object to be the specified
655 * value plus 1900. This {@code Date} object is modified so
656 * that it represents a point in time within the specified year,
657 * with the month, date, hour, minute, and second the same as
658 * before, as interpreted in the local time zone. (Of course, if
659 * the date was February 29, for example, and the year is set to a
660 * non-leap year, then the new date will be treated as if it were
661 * on March 1.)
662 *
663 * @param year the year value.
664 * @see java.util.Calendar
665 * @deprecated As of JDK version 1.1,
666 * replaced by {@code Calendar.set(Calendar.YEAR, year + 1900)}.
667 */
668 @Deprecated
669 public void setYear(int year) {
670 getCalendarDate().setNormalizedYear(year + 1900);
671 }
672
673 /**
674 * Returns a number representing the month that contains or begins
675 * with the instant in time represented by this {@code Date} object.
676 * The value returned is between {@code 0} and {@code 11},
677 * with the value {@code 0} representing January.
678 *
679 * @return the month represented by this date.
680 * @see java.util.Calendar
681 * @deprecated As of JDK version 1.1,
682 * replaced by {@code Calendar.get(Calendar.MONTH)}.
683 */
684 @Deprecated
685 public int getMonth() {
686 return normalize().getMonth() - 1; // adjust 1-based to 0-based
687 }
688
689 /**
690 * Sets the month of this date to the specified value. This
691 * {@code Date} object is modified so that it represents a point
692 * in time within the specified month, with the year, date, hour,
693 * minute, and second the same as before, as interpreted in the
694 * local time zone. If the date was October 31, for example, and
695 * the month is set to June, then the new date will be treated as
696 * if it were on July 1, because June has only 30 days.
697 *
698 * @param month the month value between 0-11.
699 * @see java.util.Calendar
700 * @deprecated As of JDK version 1.1,
701 * replaced by {@code Calendar.set(Calendar.MONTH, int month)}.
702 */
703 @Deprecated
704 public void setMonth(int month) {
705 int y = 0;
706 if (month >= 12) {
707 y = month / 12;
708 month %= 12;
709 } else if (month < 0) {
710 y = CalendarUtils.floorDivide(month, 12);
711 month = CalendarUtils.mod(month, 12);
712 }
713 BaseCalendar.Date d = getCalendarDate();
714 if (y != 0) {
715 d.setNormalizedYear(d.getNormalizedYear() + y);
716 }
717 d.setMonth(month + 1); // adjust 0-based to 1-based month numbering
718 }
719
720 /**
721 * Returns the day of the month represented by this {@code Date} object.
722 * The value returned is between {@code 1} and {@code 31}
723 * representing the day of the month that contains or begins with the
724 * instant in time represented by this {@code Date} object, as
725 * interpreted in the local time zone.
726 *
727 * @return the day of the month represented by this date.
728 * @see java.util.Calendar
729 * @deprecated As of JDK version 1.1,
730 * replaced by {@code Calendar.get(Calendar.DAY_OF_MONTH)}.
731 */
732 @Deprecated
733 public int getDate() {
734 return normalize().getDayOfMonth();
735 }
736
737 /**
738 * Sets the day of the month of this {@code Date} object to the
739 * specified value. This {@code Date} object is modified so that
740 * it represents a point in time within the specified day of the
741 * month, with the year, month, hour, minute, and second the same
742 * as before, as interpreted in the local time zone. If the date
743 * was April 30, for example, and the date is set to 31, then it
744 * will be treated as if it were on May 1, because April has only
745 * 30 days.
746 *
747 * @param date the day of the month value between 1-31.
748 * @see java.util.Calendar
749 * @deprecated As of JDK version 1.1,
750 * replaced by {@code Calendar.set(Calendar.DAY_OF_MONTH, int date)}.
751 */
752 @Deprecated
753 public void setDate(int date) {
754 getCalendarDate().setDayOfMonth(date);
755 }
756
757 /**
758 * Returns the day of the week represented by this date. The
759 * returned value ({@code 0} = Sunday, {@code 1} = Monday,
760 * {@code 2} = Tuesday, {@code 3} = Wednesday, {@code 4} =
761 * Thursday, {@code 5} = Friday, {@code 6} = Saturday)
762 * represents the day of the week that contains or begins with
763 * the instant in time represented by this {@code Date} object,
764 * as interpreted in the local time zone.
765 *
766 * @return the day of the week represented by this date.
767 * @see java.util.Calendar
768 * @deprecated As of JDK version 1.1,
769 * replaced by {@code Calendar.get(Calendar.DAY_OF_WEEK)}.
770 */
771 @Deprecated
772 public int getDay() {
773 return normalize().getDayOfWeek() - BaseCalendar.SUNDAY;
774 }
775
776 /**
777 * Returns the hour represented by this {@code Date} object. The
778 * returned value is a number ({@code 0} through {@code 23})
779 * representing the hour within the day that contains or begins
780 * with the instant in time represented by this {@code Date}
781 * object, as interpreted in the local time zone.
782 *
783 * @return the hour represented by this date.
784 * @see java.util.Calendar
785 * @deprecated As of JDK version 1.1,
786 * replaced by {@code Calendar.get(Calendar.HOUR_OF_DAY)}.
787 */
788 @Deprecated
789 public int getHours() {
790 return normalize().getHours();
791 }
792
793 /**
794 * Sets the hour of this {@code Date} object to the specified value.
795 * This {@code Date} object is modified so that it represents a point
796 * in time within the specified hour of the day, with the year, month,
797 * date, minute, and second the same as before, as interpreted in the
798 * local time zone.
799 *
800 * @param hours the hour value.
801 * @see java.util.Calendar
802 * @deprecated As of JDK version 1.1,
803 * replaced by {@code Calendar.set(Calendar.HOUR_OF_DAY, int hours)}.
804 */
805 @Deprecated
806 public void setHours(int hours) {
807 getCalendarDate().setHours(hours);
808 }
809
810 /**
811 * Returns the number of minutes past the hour represented by this date,
812 * as interpreted in the local time zone.
813 * The value returned is between {@code 0} and {@code 59}.
814 *
815 * @return the number of minutes past the hour represented by this date.
816 * @see java.util.Calendar
817 * @deprecated As of JDK version 1.1,
818 * replaced by {@code Calendar.get(Calendar.MINUTE)}.
819 */
820 @Deprecated
821 public int getMinutes() {
822 return normalize().getMinutes();
823 }
824
825 /**
826 * Sets the minutes of this {@code Date} object to the specified value.
827 * This {@code Date} object is modified so that it represents a point
828 * in time within the specified minute of the hour, with the year, month,
829 * date, hour, and second the same as before, as interpreted in the
830 * local time zone.
831 *
832 * @param minutes the value of the minutes.
833 * @see java.util.Calendar
834 * @deprecated As of JDK version 1.1,
835 * replaced by {@code Calendar.set(Calendar.MINUTE, int minutes)}.
836 */
837 @Deprecated
838 public void setMinutes(int minutes) {
839 getCalendarDate().setMinutes(minutes);
840 }
841
842 /**
843 * Returns the number of seconds past the minute represented by this date.
844 * The value returned is between {@code 0} and {@code 61}. The
845 * values {@code 60} and {@code 61} can only occur on those
846 * Java Virtual Machines that take leap seconds into account.
847 *
848 * @return the number of seconds past the minute represented by this date.
849 * @see java.util.Calendar
850 * @deprecated As of JDK version 1.1,
851 * replaced by {@code Calendar.get(Calendar.SECOND)}.
852 */
853 @Deprecated
854 public int getSeconds() {
855 return normalize().getSeconds();
856 }
857
858 /**
859 * Sets the seconds of this {@code Date} to the specified value.
860 * This {@code Date} object is modified so that it represents a
861 * point in time within the specified second of the minute, with
862 * the year, month, date, hour, and minute the same as before, as
863 * interpreted in the local time zone.
864 *
865 * @param seconds the seconds value.
866 * @see java.util.Calendar
867 * @deprecated As of JDK version 1.1,
868 * replaced by {@code Calendar.set(Calendar.SECOND, int seconds)}.
869 */
870 @Deprecated
871 public void setSeconds(int seconds) {
872 getCalendarDate().setSeconds(seconds);
873 }
874
875 /**
876 * Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
877 * represented by this {@code Date} object.
878 *
879 * @return the number of milliseconds since January 1, 1970, 00:00:00 GMT
880 * represented by this date.
881 */
882 public long getTime() {
883 return getTimeImpl();
884 }
885
886 private final long getTimeImpl() {
887 if (cdate != null && !cdate.isNormalized()) {
888 normalize();
889 }
890 return fastTime;
891 }
892
893 /**
894 * Sets this {@code Date} object to represent a point in time that is
895 * {@code time} milliseconds after January 1, 1970 00:00:00 GMT.
896 *
897 * @param time the number of milliseconds.
898 */
899 public void setTime(long time) {
900 fastTime = time;
901 cdate = null;
902 }
903
904 /**
905 * Tests if this date is before the specified date.
906 *
907 * @param when a date.
908 * @return {@code true} if and only if the instant of time
909 * represented by this {@code Date} object is strictly
910 * earlier than the instant represented by {@code when};
911 * {@code false} otherwise.
912 * @exception NullPointerException if {@code when} is null.
913 */
914 public boolean before(Date when) {
915 return getMillisOf(this) < getMillisOf(when);
916 }
917
918 /**
919 * Tests if this date is after the specified date.
920 *
921 * @param when a date.
922 * @return {@code true} if and only if the instant represented
923 * by this {@code Date} object is strictly later than the
924 * instant represented by {@code when};
925 * {@code false} otherwise.
926 * @exception NullPointerException if {@code when} is null.
927 */
928 public boolean after(Date when) {
929 return getMillisOf(this) > getMillisOf(when);
930 }
931
932 /**
933 * Compares two dates for equality.
934 * The result is {@code true} if and only if the argument is
935 * not {@code null} and is a {@code Date} object that
936 * represents the same point in time, to the millisecond, as this object.
937 * <p>
938 * Thus, two {@code Date} objects are equal if and only if the
939 * {@code getTime} method returns the same {@code long}
940 * value for both.
941 *
942 * @param obj the object to compare with.
943 * @return {@code true} if the objects are the same;
944 * {@code false} otherwise.
945 * @see java.util.Date#getTime()
946 */
947 public boolean equals(Object obj) {
948 return obj instanceof Date && getTime() == ((Date) obj).getTime();
949 }
950
951 /**
952 * Returns the millisecond value of this {@code Date} object
953 * without affecting its internal state.
954 */
955 static final long getMillisOf(Date date) {
956 if (date.getClass() != Date.class) {
957 return date.getTime();
958 }
959 if (date.cdate == null || date.cdate.isNormalized()) {
960 return date.fastTime;
961 }
962 BaseCalendar.Date d = (BaseCalendar.Date) date.cdate.clone();
963 return gcal.getTime(d);
964 }
965
966 /**
967 * Compares two Dates for ordering.
968 *
969 * @param anotherDate the {@code Date} to be compared.
970 * @return the value {@code 0} if the argument Date is equal to
971 * this Date; a value less than {@code 0} if this Date
972 * is before the Date argument; and a value greater than
973 * {@code 0} if this Date is after the Date argument.
974 * @since 1.2
975 * @exception NullPointerException if {@code anotherDate} is null.
976 */
977 public int compareTo(Date anotherDate) {
978 long thisTime = getMillisOf(this);
979 long anotherTime = getMillisOf(anotherDate);
980 return (thisTime<anotherTime ? -1 : (thisTime==anotherTime ? 0 : 1));
981 }
982
983 /**
984 * Returns a hash code value for this object. The result is the
985 * exclusive OR of the two halves of the primitive {@code long}
986 * value returned by the {@link Date#getTime}
987 * method. That is, the hash code is the value of the expression:
988 * <blockquote><pre>{@code
989 * (int)(this.getTime()^(this.getTime() >>> 32))
990 * }</pre></blockquote>
991 *
992 * @return a hash code value for this object.
993 */
994 public int hashCode() {
995 long ht = this.getTime();
996 return (int) ht ^ (int) (ht >> 32);
997 }
998
999 /**
1000 * Converts this {@code Date} object to a {@code String}
1001 * of the form:
1002 * <blockquote><pre>
1003 * dow mon dd hh:mm:ss zzz yyyy</pre></blockquote>
1004 * where:<ul>
1005 * <li>{@code dow} is the day of the week ({@code Sun, Mon, Tue, Wed,
1006 * Thu, Fri, Sat}).
1007 * <li>{@code mon} is the month ({@code Jan, Feb, Mar, Apr, May, Jun,
1008 * Jul, Aug, Sep, Oct, Nov, Dec}).
1009 * <li>{@code dd} is the day of the month ({@code 01} through
1010 * {@code 31}), as two decimal digits.
1011 * <li>{@code hh} is the hour of the day ({@code 00} through
1012 * {@code 23}), as two decimal digits.
1013 * <li>{@code mm} is the minute within the hour ({@code 00} through
1014 * {@code 59}), as two decimal digits.
1015 * <li>{@code ss} is the second within the minute ({@code 00} through
1016 * {@code 61}, as two decimal digits.
1017 * <li>{@code zzz} is the time zone (and may reflect daylight saving
1018 * time). Standard time zone abbreviations include those
1019 * recognized by the method {@code parse}. If time zone
1020 * information is not available, then {@code zzz} is empty -
1021 * that is, it consists of no characters at all.
1022 * <li>{@code yyyy} is the year, as four decimal digits.
1023 * </ul>
1024 *
1025 * @return a string representation of this date.
1026 * @see java.util.Date#toLocaleString()
1027 * @see java.util.Date#toGMTString()
1028 */
1029 public String toString() {
1030 // "EEE MMM dd HH:mm:ss zzz yyyy";
1031 BaseCalendar.Date date = normalize();
1032 StringBuilder sb = new StringBuilder(28);
1033 int index = date.getDayOfWeek();
1034 if (index == BaseCalendar.SUNDAY) {
1035 index = 8;
1036 }
1037 convertToAbbr(sb, wtb[index]).append(' '); // EEE
1038 convertToAbbr(sb, wtb[date.getMonth() - 1 + 2 + 7]).append(' '); // MMM
1039 CalendarUtils.sprintf0d(sb, date.getDayOfMonth(), 2).append(' '); // dd
1040
1041 CalendarUtils.sprintf0d(sb, date.getHours(), 2).append(':'); // HH
1042 CalendarUtils.sprintf0d(sb, date.getMinutes(), 2).append(':'); // mm
1043 CalendarUtils.sprintf0d(sb, date.getSeconds(), 2).append(' '); // ss
1044 TimeZone zi = date.getZone();
1045 if (zi != null) {
1046 sb.append(zi.getDisplayName(date.isDaylightTime(), TimeZone.SHORT, Locale.US)); // zzz
1047 } else {
1048 sb.append("GMT");
1049 }
1050 sb.append(' ').append(date.getYear()); // yyyy
1051 return sb.toString();
1052 }
1053
1054 /**
1055 * Converts the given name to its 3-letter abbreviation (e.g.,
1056 * "monday" -> "Mon") and stored the abbreviation in the given
1057 * {@code StringBuilder}.
1058 */
1059 private static final StringBuilder convertToAbbr(StringBuilder sb, String name) {
1060 sb.append(Character.toUpperCase(name.charAt(0)));
1061 sb.append(name.charAt(1)).append(name.charAt(2));
1062 return sb;
1063 }
1064
1065 /**
1066 * Creates a string representation of this {@code Date} object in an
1067 * implementation-dependent form. The intent is that the form should
1068 * be familiar to the user of the Java application, wherever it may
1069 * happen to be running. The intent is comparable to that of the
1070 * "{@code %c}" format supported by the {@code strftime()}
1071 * function of ISO C.
1072 *
1073 * @return a string representation of this date, using the locale
1074 * conventions.
1075 * @see java.text.DateFormat
1076 * @see java.util.Date#toString()
1077 * @see java.util.Date#toGMTString()
1078 * @deprecated As of JDK version 1.1,
1079 * replaced by {@code DateFormat.format(Date date)}.
1080 */
1081 @Deprecated
1082 public String toLocaleString() {
1083 DateFormat formatter = DateFormat.getDateTimeInstance();
1084 return formatter.format(this);
1085 }
1086
1087 /**
1088 * Creates a string representation of this {@code Date} object of
1089 * the form:
1090 * <blockquote><pre>
1091 * d mon yyyy hh:mm:ss GMT</pre></blockquote>
1092 * where:<ul>
1093 * <li><i>d</i> is the day of the month ({@code 1} through {@code 31}),
1094 * as one or two decimal digits.
1095 * <li><i>mon</i> is the month ({@code Jan, Feb, Mar, Apr, May, Jun, Jul,
1096 * Aug, Sep, Oct, Nov, Dec}).
1097 * <li><i>yyyy</i> is the year, as four decimal digits.
1098 * <li><i>hh</i> is the hour of the day ({@code 00} through {@code 23}),
1099 * as two decimal digits.
1100 * <li><i>mm</i> is the minute within the hour ({@code 00} through
1101 * {@code 59}), as two decimal digits.
1102 * <li><i>ss</i> is the second within the minute ({@code 00} through
1103 * {@code 61}), as two decimal digits.
1104 * <li><i>GMT</i> is exactly the ASCII letters "{@code GMT}" to indicate
1105 * Greenwich Mean Time.
1106 * </ul><p>
1107 * The result does not depend on the local time zone.
1108 *
1109 * @return a string representation of this date, using the Internet GMT
1110 * conventions.
1111 * @see java.text.DateFormat
1112 * @see java.util.Date#toString()
1113 * @see java.util.Date#toLocaleString()
1114 * @deprecated As of JDK version 1.1,
1115 * replaced by {@code DateFormat.format(Date date)}, using a
1116 * GMT {@code TimeZone}.
1117 */
1118 @Deprecated
1119 public String toGMTString() {
1120 // d MMM yyyy HH:mm:ss 'GMT'
1121 long t = getTime();
1122 BaseCalendar cal = getCalendarSystem(t);
1123 BaseCalendar.Date date =
1124 (BaseCalendar.Date) cal.getCalendarDate(getTime(), (TimeZone)null);
1125 StringBuilder sb = new StringBuilder(32);
1126 CalendarUtils.sprintf0d(sb, date.getDayOfMonth(), 1).append(' '); // d
1127 convertToAbbr(sb, wtb[date.getMonth() - 1 + 2 + 7]).append(' '); // MMM
1128 sb.append(date.getYear()).append(' '); // yyyy
1129 CalendarUtils.sprintf0d(sb, date.getHours(), 2).append(':'); // HH
1130 CalendarUtils.sprintf0d(sb, date.getMinutes(), 2).append(':'); // mm
1131 CalendarUtils.sprintf0d(sb, date.getSeconds(), 2); // ss
1132 sb.append(" GMT"); // ' GMT'
1133 return sb.toString();
1134 }
1135
1136 /**
1137 * Returns the offset, measured in minutes, for the local time zone
1138 * relative to UTC that is appropriate for the time represented by
1139 * this {@code Date} object.
1140 * <p>
1141 * For example, in Massachusetts, five time zones west of Greenwich:
1142 * <blockquote><pre>
1143 * new Date(96, 1, 14).getTimezoneOffset() returns 300</pre></blockquote>
1144 * because on February 14, 1996, standard time (Eastern Standard Time)
1145 * is in use, which is offset five hours from UTC; but:
1146 * <blockquote><pre>
1147 * new Date(96, 5, 1).getTimezoneOffset() returns 240</pre></blockquote>
1148 * because on June 1, 1996, daylight saving time (Eastern Daylight Time)
1149 * is in use, which is offset only four hours from UTC.<p>
1150 * This method produces the same result as if it computed:
1151 * <blockquote><pre>
1152 * (this.getTime() - UTC(this.getYear(),
1153 * this.getMonth(),
1154 * this.getDate(),
1155 * this.getHours(),
1156 * this.getMinutes(),
1157 * this.getSeconds())) / (60 * 1000)
1158 * </pre></blockquote>
1159 *
1160 * @return the time-zone offset, in minutes, for the current time zone.
1161 * @see java.util.Calendar#ZONE_OFFSET
1162 * @see java.util.Calendar#DST_OFFSET
1163 * @see java.util.TimeZone#getDefault
1164 * @deprecated As of JDK version 1.1,
1165 * replaced by {@code -(Calendar.get(Calendar.ZONE_OFFSET) +
1166 * Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000)}.
1167 */
1168 @Deprecated
1169 public int getTimezoneOffset() {
1170 int zoneOffset;
1171 if (cdate == null) {
1172 TimeZone tz = TimeZone.getDefaultRef();
1173 if (tz instanceof ZoneInfo) {
1174 zoneOffset = ((ZoneInfo)tz).getOffsets(fastTime, null);
1175 } else {
1176 zoneOffset = tz.getOffset(fastTime);
1177 }
1178 } else {
1179 normalize();
1180 zoneOffset = cdate.getZoneOffset();
1181 }
1182 return -zoneOffset/60000; // convert to minutes
1183 }
1184
1185 private final BaseCalendar.Date getCalendarDate() {
1186 if (cdate == null) {
1187 BaseCalendar cal = getCalendarSystem(fastTime);
1188 cdate = (BaseCalendar.Date) cal.getCalendarDate(fastTime,
1189 TimeZone.getDefaultRef());
1190 }
1191 return cdate;
1192 }
1193
1194 private final BaseCalendar.Date normalize() {
1195 if (cdate == null) {
1196 BaseCalendar cal = getCalendarSystem(fastTime);
1197 cdate = (BaseCalendar.Date) cal.getCalendarDate(fastTime,
1198 TimeZone.getDefaultRef());
1199 return cdate;
1200 }
1201
1202 // Normalize cdate with the TimeZone in cdate first. This is
1203 // required for the compatible behavior.
1204 if (!cdate.isNormalized()) {
1205 cdate = normalize(cdate);
1206 }
1207
1208 // If the default TimeZone has changed, then recalculate the
1209 // fields with the new TimeZone.
1210 TimeZone tz = TimeZone.getDefaultRef();
1211 if (tz != cdate.getZone()) {
1212 cdate.setZone(tz);
1213 CalendarSystem cal = getCalendarSystem(cdate);
1214 cal.getCalendarDate(fastTime, cdate);
1215 }
1216 return cdate;
1217 }
1218
1219 // fastTime and the returned data are in sync upon return.
1220 private final BaseCalendar.Date normalize(BaseCalendar.Date date) {
1221 int y = date.getNormalizedYear();
1222 int m = date.getMonth();
1223 int d = date.getDayOfMonth();
1224 int hh = date.getHours();
1225 int mm = date.getMinutes();
1226 int ss = date.getSeconds();
1227 int ms = date.getMillis();
1228 TimeZone tz = date.getZone();
1229
1230 // If the specified year can't be handled using a long value
1231 // in milliseconds, GregorianCalendar is used for full
1232 // compatibility with underflow and overflow. This is required
1233 // by some JCK tests. The limits are based max year values -
1234 // years that can be represented by max values of d, hh, mm,
1235 // ss and ms. Also, let GregorianCalendar handle the default
1236 // cutover year so that we don't need to worry about the
1237 // transition here.
1238 if (y == 1582 || y > 280000000 || y < -280000000) {
1239 if (tz == null) {
1240 tz = TimeZone.getTimeZone("GMT");
1241 }
1242 GregorianCalendar gc = new GregorianCalendar(tz);
1243 gc.clear();
1244 gc.set(GregorianCalendar.MILLISECOND, ms);
1245 gc.set(y, m-1, d, hh, mm, ss);
1246 fastTime = gc.getTimeInMillis();
1247 BaseCalendar cal = getCalendarSystem(fastTime);
1248 date = (BaseCalendar.Date) cal.getCalendarDate(fastTime, tz);
1249 return date;
1250 }
1251
1252 BaseCalendar cal = getCalendarSystem(y);
1253 if (cal != getCalendarSystem(date)) {
1254 date = (BaseCalendar.Date) cal.newCalendarDate(tz);
1255 date.setNormalizedDate(y, m, d).setTimeOfDay(hh, mm, ss, ms);
1256 }
1257 // Perform the GregorianCalendar-style normalization.
1258 fastTime = cal.getTime(date);
1259
1260 // In case the normalized date requires the other calendar
1261 // system, we need to recalculate it using the other one.
1262 BaseCalendar ncal = getCalendarSystem(fastTime);
1263 if (ncal != cal) {
1264 date = (BaseCalendar.Date) ncal.newCalendarDate(tz);
1265 date.setNormalizedDate(y, m, d).setTimeOfDay(hh, mm, ss, ms);
1266 fastTime = ncal.getTime(date);
1267 }
1268 return date;
1269 }
1270
1271 /**
1272 * Returns the Gregorian or Julian calendar system to use with the
1273 * given date. Use Gregorian from October 15, 1582.
1274 *
1275 * @param year normalized calendar year (not -1900)
1276 * @return the CalendarSystem to use for the specified date
1277 */
1278 private static final BaseCalendar getCalendarSystem(int year) {
1279 if (year >= 1582) {
1280 return gcal;
1281 }
1282 return getJulianCalendar();
1283 }
1284
1285 private static final BaseCalendar getCalendarSystem(long utc) {
1286 // Quickly check if the time stamp given by `utc' is the Epoch
1287 // or later. If it's before 1970, we convert the cutover to
1288 // local time to compare.
1289 if (utc >= 0
1290 || utc >= GregorianCalendar.DEFAULT_GREGORIAN_CUTOVER
1291 - TimeZone.getDefaultRef().getOffset(utc)) {
1292 return gcal;
1293 }
1294 return getJulianCalendar();
1295 }
1296
1297 private static final BaseCalendar getCalendarSystem(BaseCalendar.Date cdate) {
1298 if (jcal == null) {
1299 return gcal;
1300 }
1301 if (cdate.getEra() != null) {
1302 return jcal;
1303 }
1304 return gcal;
1305 }
1306
1307 private static final synchronized BaseCalendar getJulianCalendar() {
1308 if (jcal == null) {
1309 jcal = (BaseCalendar) CalendarSystem.forName("julian");
1310 }
1311 return jcal;
1312 }
1313
1314 /**
1315 * Save the state of this object to a stream (i.e., serialize it).
1316 *
1317 * @serialData The value returned by {@code getTime()}
1318 * is emitted (long). This represents the offset from
1319 * January 1, 1970, 00:00:00 GMT in milliseconds.
1320 */
1321 private void writeObject(ObjectOutputStream s)
1322 throws IOException
1323 {
1324 s.defaultWriteObject();
1325 s.writeLong(getTimeImpl());
1326 }
1327
1328 /**
1329 * Reconstitute this object from a stream (i.e., deserialize it).
1330 */
1331 private void readObject(ObjectInputStream s)
1332 throws IOException, ClassNotFoundException
1333 {
1334 s.defaultReadObject();
1335 fastTime = s.readLong();
1336 }
1337
1338 /**
1339 * Obtains an instance of {@code Date} from an {@code Instant} object.
1340 * <p>
1341 * {@code Instant} uses a precision of nanoseconds, whereas {@code Date}
1342 * uses a precision of milliseconds. The conversion will truncate any
1343 * excess precision information as though the amount in nanoseconds was
1344 * subject to integer division by one million.
1345 * <p>
1346 * {@code Instant} can store points on the time-line further in the future
1347 * and further in the past than {@code Date}. In this scenario, this method
1348 * will throw an exception.
1349 *
1350 * @param instant the instant to convert
1351 * @return a {@code Date} representing the same point on the time-line as
1352 * the provided instant
1353 * @exception NullPointerException if {@code instant} is null.
1354 * @exception IllegalArgumentException if the instant is too large to
1355 * represent as a {@code Date}
1356 * @since 1.8
1357 */
1358 public static Date from(Instant instant) {
1359 try {
1360 return new Date(instant.toEpochMilli());
1361 } catch (ArithmeticException ex) {
1362 throw new IllegalArgumentException(ex);
1363 }
1364 }
1365
1366 /**
1367 * Converts this {@code Date} object to an {@code Instant}.
1368 * <p>
1369 * The conversion creates an {@code Instant} that represents the same
1370 * point on the time-line as this {@code Date}.
1371 *
1372 * @return an instant representing the same point on the time-line as
1373 * this {@code Date} object
1374 * @since 1.8
1375 */
1376 public Instant toInstant() {
1377 return Instant.ofEpochMilli(getTime());
1378 }
1379 }