001 /* java.util.Date 002 Copyright (C) 1998, 1999, 2000, 2001, 2005 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.util; 039 040 import java.io.IOException; 041 import java.io.ObjectInputStream; 042 import java.io.ObjectOutputStream; 043 import java.io.Serializable; 044 import java.text.DateFormat; 045 import java.text.SimpleDateFormat; 046 047 /** 048 * <p> 049 * This class represents a specific time in milliseconds since the epoch. 050 * The epoch is 1970, January 1 00:00:00.0000 UTC. 051 * </p> 052 * <p> 053 * <code>Date</code> is intended to reflect universal time coordinate (UTC), 054 * but this depends on the underlying host environment. Most operating systems 055 * don't handle the leap second, which occurs about once every year or 056 * so. The leap second is added to the last minute of the day on either 057 * the 30th of June or the 31st of December, creating a minute 61 seconds 058 * in length. 059 * </p> 060 * <p> 061 * The representations of the date fields are as follows: 062 * <ul> 063 * <li> 064 * Years are specified as the difference between the year 065 * and 1900. Thus, the final year used is equal to 066 * 1900 + y, where y is the input value. 067 * </li> 068 * <li> 069 * Months are represented using zero-based indexing, 070 * making 0 January and 11 December. 071 * </li> 072 * <li> 073 * Dates are represented with the usual values of 074 * 1 through to 31. 075 * </li> 076 * <li> 077 * Hours are represented in the twenty-four hour clock, 078 * with integer values from 0 to 23. 12am is 0, and 079 * 12pm is 12. 080 * </li> 081 * <li> 082 * Minutes are again as usual, with values from 0 to 59. 083 * </li> 084 * <li> 085 * Seconds are represented with the values 0 through to 61, 086 * with 60 and 61 being leap seconds (as per the ISO C standard). 087 * </li> 088 * </ul> 089 * </p> 090 * <p> 091 * Prior to JDK 1.1, this class was the sole class handling date and time 092 * related functionality. However, this particular solution was not 093 * amenable to internationalization. The new <code>Calendar</code> 094 * class should now be used to handle dates and times, with <code>Date</code> 095 * being used only for values in milliseconds since the epoch. The 096 * <code>Calendar</code> class, and its concrete implementations, handle 097 * the interpretation of these values into minutes, hours, days, months 098 * and years. The formatting and parsing of dates is left to the 099 * <code>DateFormat</code> class, which is able to handle the different 100 * types of date format which occur in different locales. 101 * </p> 102 * 103 * @see Calendar 104 * @see GregorianCalendar 105 * @see java.text.DateFormat 106 * @author Jochen Hoenicke 107 * @author Per Bothner (bothner@cygnus.com) 108 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 109 */ 110 public class Date 111 implements Cloneable, Comparable<Date>, Serializable 112 { 113 /** 114 * This is the serialization UID for this class 115 * for compatability with Sun's JDK. 116 */ 117 private static final long serialVersionUID = 7523967970034938905L; 118 119 /** 120 * The time in milliseconds since the epoch. 121 */ 122 private transient long time; 123 124 /** 125 * An array of week names used to map names to integer values. 126 */ 127 private static final String[] weekNames = { "Sun", "Mon", "Tue", "Wed", 128 "Thu", "Fri", "Sat" }; 129 /** 130 * An array of month names used to map names to integer values. 131 */ 132 private static final String[] monthNames = { "Jan", "Feb", "Mar", "Apr", 133 "May", "Jun", "Jul", "Aug", 134 "Sep", "Oct", "Nov", "Dec" }; 135 /** 136 * Creates a new Date Object representing the current time. 137 */ 138 public Date() 139 { 140 time = System.currentTimeMillis(); 141 } 142 143 /** 144 * Creates a new Date Object representing the given time. 145 * 146 * @param time the time in milliseconds since the epoch. 147 */ 148 public Date(long time) 149 { 150 this.time = time; 151 } 152 153 /** 154 * Creates a new Date Object representing the given time. 155 * 156 * @deprecated use <code>new GregorianCalendar(year+1900, month, 157 * day)</code> instead. 158 * @param year the difference between the required year and 1900. 159 * @param month the month as a value between 0 and 11. 160 * @param day the day as a value between 0 and 31. 161 */ 162 public Date(int year, int month, int day) 163 { 164 this(year, month, day, 0, 0, 0); 165 } 166 167 /** 168 * Creates a new Date Object representing the given time. 169 * 170 * @deprecated use <code>new GregorianCalendar(year+1900, month, 171 * day, hour, min)</code> instead. 172 * @param year the difference between the required year and 1900. 173 * @param month the month as a value between 0 and 11. 174 * @param day the day as a value between 0 and 31. 175 * @param hour the hour as a value between 0 and 23, in 24-hour 176 * clock notation. 177 * @param min the minute as a value between 0 and 59. 178 */ 179 public Date(int year, int month, int day, int hour, int min) 180 { 181 this(year, month, day, hour, min, 0); 182 } 183 184 /** 185 * Creates a new Date Object representing the given time. 186 * 187 * @deprecated use <code>new GregorianCalendar(year+1900, month, 188 * day, hour, min, sec)</code> instead. 189 * @param year the difference between the required year and 1900. 190 * @param month the month as a value between 0 and 11. 191 * @param day the day as a value between 0 and 31. 192 * @param hour the hour as a value between 0 and 23, in 24-hour 193 * clock notation. 194 * @param min the minute as a value between 0 and 59. 195 * @param sec the second as a value between 0 and 61 (with 60 196 * and 61 being leap seconds). 197 */ 198 public Date(int year, int month, int day, int hour, int min, int sec) 199 { 200 GregorianCalendar cal = 201 new GregorianCalendar(year + 1900, month, day, hour, min, sec); 202 time = cal.getTimeInMillis(); 203 } 204 205 /** 206 * Creates a new Date from the given string representation. This 207 * does the same as <code>new Date(Date.parse(s))</code> 208 * @see #parse 209 * @deprecated use <code>java.text.DateFormat.parse(s)</code> instead. 210 */ 211 public Date(String s) 212 { 213 time = parse(s); 214 } 215 216 /** 217 * Returns a copy of this <code>Date</code> object. 218 * 219 * @return a copy, or null if the object couldn't be 220 * cloned. 221 * @see Object#clone() 222 */ 223 public Object clone() 224 { 225 try 226 { 227 return super.clone(); 228 } 229 catch (CloneNotSupportedException ex) 230 { 231 return null; 232 } 233 } 234 235 /** 236 * Returns the number of milliseconds since the epoch 237 * specified by the given arguments. The arguments are 238 * interpreted relative to UTC rather than the local 239 * time zone. 240 * 241 * @deprecated Use <code>Calendar</code> with a UTC 242 * <code>TimeZone</code> instead. 243 * @param year the difference between the required year and 1900. 244 * @param month the month as a value between 0 and 11. 245 * @param date the day as a value between 0 and 31. 246 * @param hrs the hour as a value between 0 and 23, in 24-hour 247 * clock notation. 248 * @param min the minute as a value between 0 and 59. 249 * @param sec the second as a value between 0 and 61 (with 60 250 * and 61 being leap seconds). 251 * @return the time in milliseconds since the epoch. 252 */ 253 public static long UTC(int year, int month, int date, 254 int hrs, int min, int sec) 255 { 256 GregorianCalendar cal = 257 new GregorianCalendar(year + 1900, month, date, hrs, min, sec); 258 cal.set(Calendar.ZONE_OFFSET, 0); 259 cal.set(Calendar.DST_OFFSET, 0); 260 return cal.getTimeInMillis(); 261 } 262 263 /** 264 * Gets the time represented by this object. 265 * 266 * @return the time in milliseconds since the epoch. 267 */ 268 public long getTime() 269 { 270 return time; 271 } 272 273 /** 274 * Returns the number of minutes offset used with UTC to give the time 275 * represented by this object in the current time zone. The date information 276 * from this object is also used to determine whether or not daylight savings 277 * time is in effect. For example, the offset for the UK would be 0 if the 278 * month of the date object was January, and 1 if the month was August. 279 * 280 * @deprecated use 281 * <code>Calendar.get(Calendar.ZONE_OFFSET)+Calendar.get(Calendar.DST_OFFSET)</code> 282 * instead. 283 * @return The time zone offset in minutes of the local time zone 284 * relative to UTC. The time represented by this object is used to 285 * determine if we should use daylight savings. 286 */ 287 public int getTimezoneOffset() 288 { 289 Calendar cal = Calendar.getInstance(); 290 cal.setTimeInMillis(time); 291 return - (cal.get(Calendar.ZONE_OFFSET) 292 + cal.get(Calendar.DST_OFFSET)) / (60 * 1000); 293 } 294 295 /** 296 * Sets the time which this object should represent. 297 * 298 * @param time the time in milliseconds since the epoch. 299 */ 300 public void setTime(long time) 301 { 302 this.time = time; 303 } 304 305 /** 306 * Tests if this date is after the specified date. 307 * 308 * @param when the other date 309 * @return true, if the date represented by this object is 310 * strictly later than the time represented by when. 311 */ 312 public boolean after(Date when) 313 { 314 return time > when.time; 315 } 316 317 /** 318 * Tests if this date is before the specified date. 319 * 320 * @param when the other date 321 * @return true, if the date represented by when is strictly later 322 * than the time represented by this object. 323 */ 324 public boolean before(Date when) 325 { 326 return time < when.time; 327 } 328 329 /** 330 * Compares two dates for equality. 331 * 332 * @param obj the object to compare. 333 * @return true, if obj is a Date object and the time represented 334 * by obj is exactly the same as the time represented by this 335 * object. 336 */ 337 public boolean equals(Object obj) 338 { 339 return (obj instanceof Date && time == ((Date) obj).time); 340 } 341 342 /** 343 * Compares two dates. 344 * 345 * @param when the other date. 346 * @return 0, if the date represented 347 * by obj is exactly the same as the time represented by this 348 * object, a negative if this Date is before the other Date, and 349 * a positive value otherwise. 350 */ 351 public int compareTo(Date when) 352 { 353 return (time < when.time) ? -1 : (time == when.time) ? 0 : 1; 354 } 355 356 /** 357 * Computes the hash code of this <code>Date</code> as the 358 * XOR of the most significant and the least significant 359 * 32 bits of the 64 bit milliseconds value. 360 * 361 * @return the hash code. 362 */ 363 public int hashCode() 364 { 365 return (int) time ^ (int) (time >>> 32); 366 } 367 368 /** 369 * <p> 370 * Returns a string representation of this date using 371 * the following date format: 372 * </p> 373 * <p> 374 * <code>day mon dd hh:mm:ss zz yyyy</code> 375 * </p> 376 * <p>where the fields used here are: 377 * <ul> 378 * <li> 379 * <code>day</code> -- the day of the week 380 * (Sunday through to Saturday). 381 * </li> 382 * <li> 383 * <code>mon</code> -- the month (Jan to Dec). 384 * </li> 385 * <li> 386 * <code>dd</code> -- the day of the month 387 * as two decimal digits (01 to 31). 388 * </li> 389 * <li> 390 * <code>hh</code> -- the hour of the day 391 * as two decimal digits in 24-hour clock notation 392 * (01 to 23). 393 * </li> 394 * <li> 395 * <code>mm</code> -- the minute of the day 396 * as two decimal digits (01 to 59). 397 * </li> 398 * <li> 399 * <code>ss</code> -- the second of the day 400 * as two decimal digits (01 to 61). 401 * </li> 402 * <li> 403 * <code>zz</code> -- the time zone information if available. 404 * The possible time zones used include the abbreviations 405 * recognised by <code>parse()</code> (e.g. GMT, CET, etc.) 406 * and may reflect the fact that daylight savings time is in 407 * effect. The empty string is used if there is no time zone 408 * information. 409 * </li> 410 * <li> 411 * <code>yyyy</code> -- the year as four decimal digits. 412 * </li> 413 * </ul> 414 * <p> 415 * The <code>DateFormat</code> class should now be 416 * preferred over using this method. 417 * </p> 418 * 419 * @return A string of the form 'day mon dd hh:mm:ss zz yyyy' 420 * @see #parse(String) 421 * @see DateFormat 422 */ 423 public String toString() 424 { 425 Calendar cal = Calendar.getInstance(); 426 cal.setTimeInMillis(time); 427 String day = "0" + cal.get(Calendar.DATE); 428 String hour = "0" + cal.get(Calendar.HOUR_OF_DAY); 429 String min = "0" + cal.get(Calendar.MINUTE); 430 String sec = "0" + cal.get(Calendar.SECOND); 431 String year = "000" + cal.get(Calendar.YEAR); 432 return weekNames[cal.get(Calendar.DAY_OF_WEEK) - 1] + " " 433 + monthNames[cal.get(Calendar.MONTH)] + " " 434 + day.substring(day.length() - 2) + " " 435 + hour.substring(hour.length() - 2) + ":" 436 + min.substring(min.length() - 2) + ":" 437 + sec.substring(sec.length() - 2) + " " 438 + 439 cal.getTimeZone().getDisplayName(cal.getTimeZone().inDaylightTime(this), 440 TimeZone.SHORT) + " " + 441 year.substring(year.length() - 4); 442 } 443 444 /** 445 * Returns a locale-dependent string representation of this 446 * <code>Date</code> object. 447 * 448 * @deprecated Use DateFormat.format(Date) 449 * @return A locale-dependent string representation. 450 * @see #parse(String) 451 * @see DateFormat 452 */ 453 public String toLocaleString() 454 { 455 return java.text.DateFormat.getInstance().format(this); 456 } 457 458 /** 459 * <p> 460 * Returns a string representation of this <code>Date</code> 461 * object using GMT rather than the local timezone. 462 * The following date format is used: 463 * </p> 464 * <p> 465 * <code>d mon yyyy hh:mm:ss GMT</code> 466 * </p> 467 * <p>where the fields used here are: 468 * <ul> 469 * <li> 470 * <code>d</code> -- the day of the month 471 * as one or two decimal digits (1 to 31). 472 * </li> 473 * <li> 474 * <code>mon</code> -- the month (Jan to Dec). 475 * </li> 476 * <li> 477 * <code>yyyy</code> -- the year as four decimal digits. 478 * </li> 479 * <li> 480 * <code>hh</code> -- the hour of the day 481 * as two decimal digits in 24-hour clock notation 482 * (01 to 23). 483 * </li> 484 * <li> 485 * <code>mm</code> -- the minute of the day 486 * as two decimal digits (01 to 59). 487 * </li> 488 * <li> 489 * <code>ss</code> -- the second of the day 490 * as two decimal digits (01 to 61). 491 * </li> 492 * <li> 493 * <code>GMT</code> -- the literal string "GMT" 494 * indicating Greenwich Mean Time as opposed to 495 * the local timezone. 496 * </li> 497 * </ul> 498 * 499 * @deprecated Use DateFormat.format(Date) with a GMT TimeZone. 500 * @return A string of the form 'd mon yyyy hh:mm:ss GMT' using 501 * GMT as opposed to the local timezone. 502 * @see #parse(String) 503 * @see DateFormat 504 */ 505 public String toGMTString() 506 { 507 java.text.DateFormat format = java.text.DateFormat.getInstance(); 508 format.setTimeZone(TimeZone.getTimeZone("GMT")); 509 return format.format(this); 510 } 511 512 /** 513 * Parses the time zone string. 514 * 515 * @param tok The token containing the time zone. 516 * @param sign The sign (+ or -) used by the time zone. 517 * @return An integer representing the number of minutes offset 518 * from GMT for the time zone. 519 */ 520 private static int parseTz(String tok, char sign) 521 throws IllegalArgumentException 522 { 523 int num; 524 525 try 526 { 527 // parseInt doesn't handle '+' so strip off sign. 528 num = Integer.parseInt(tok.substring(1)); 529 } 530 catch (NumberFormatException ex) 531 { 532 throw new IllegalArgumentException(tok); 533 } 534 535 // Convert hours to minutes. 536 if (num < 24) 537 num *= 60; 538 else 539 num = (num / 100) * 60 + num % 100; 540 541 return sign == '-' ? -num : num; 542 } 543 544 /** 545 * Parses the month string. 546 * 547 * @param tok the token containing the month. 548 * @return An integer between 0 and 11, representing 549 * a month from January (0) to December (11), 550 * or -1 if parsing failed. 551 */ 552 private static int parseMonth(String tok) 553 { 554 // Initialize strings for month names. 555 // We could possibly use the fields of DateFormatSymbols but that is 556 // localized and thus might not match the English words specified. 557 String months[] = { "JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", 558 "JUNE", "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", 559 "NOVEMBER", "DECEMBER" }; 560 561 int i; 562 for (i = 0; i < 12; i++) 563 if (months[i].startsWith(tok)) 564 return i; 565 566 // Return -1 if not found. 567 return -1; 568 } 569 570 /** 571 * Parses the day of the week string. 572 * 573 * @param tok the token containing the day of the week. 574 * @return true if the token was parsed successfully. 575 */ 576 private static boolean parseDayOfWeek(String tok) 577 { 578 // Initialize strings for days of the week names. 579 // We could possibly use the fields of DateFormatSymbols but that is 580 // localized and thus might not match the English words specified. 581 String daysOfWeek[] = { "SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", 582 "THURSDAY", "FRIDAY", "SATURDAY" }; 583 584 int i; 585 for (i = 0; i < 7; i++) 586 if (daysOfWeek[i].startsWith(tok)) 587 return true; 588 589 return false; 590 } 591 592 /** 593 * <p> 594 * Parses a String and returns the time, in milliseconds since the 595 * epoch, it represents. Most syntaxes are handled, including 596 * the IETF date standard "day, dd mon yyyy hh:mm:ss zz" (see 597 * <code>toString()</code> for definitions of these fields). 598 * Standard U.S. time zone abbreviations are recognised, in 599 * addition to time zone offsets in positive or negative minutes. 600 * If a time zone is specified, the specified time is assumed to 601 * be in UTC and the appropriate conversion is applied, following 602 * parsing, to convert this to the local time zone. If no zone 603 * is specified, the time is assumed to already be in the local 604 * time zone. 605 * </p> 606 * <p> 607 * The method parses the string progressively from left to right. 608 * At the end of the parsing process, either a time is returned 609 * or an <code>IllegalArgumentException</code> is thrown to signify 610 * failure. The ASCII characters A-Z, a-z, 0-9, and ',', '+', '-', 611 * ':' and '/' are the only characters permitted within the string, 612 * besides whitespace and characters enclosed within parantheses 613 * '(' and ')'. 614 * </p> 615 * <p> 616 * A sequence of consecutive digits are recognised as a number, 617 * and interpreted as follows: 618 * <ul> 619 * <li> 620 * A number preceded by a sign (+ or -) is taken to be a time zone 621 * offset. The time zone offset can be specified in either hours 622 * or minutes. The former is assumed if the number is less than 24. 623 * Otherwise, the offset is assumed to be in minutes. A - indicates 624 * a time zone west of GMT, while a + represents a time zone to the 625 * east of GMT. The time zones are always assumed to be relative 626 * to GMT, and a (redundant) specification of this can be included 627 * with the time zone. For example, '-9', 'utc-9' and 'GMT-9' all 628 * represent a time zone nine hours west of GMT. Similarly, 629 * '+4', 'ut+4' and 'UTC+4' all give 4 hours east of GMT. 630 * </li> 631 * <li> 632 * A number equal to or greater than 70 is regarded as a year specification. 633 * Values lower than 70 are only assumed to indicate a year if both the 634 * day of the month and the month itself have already been recognised. 635 * Year values less than 100 are interpreted as being relative to the current 636 * century when the <code>Date</code> class is initialised.. Given a century, 637 * x, the year is assumed to be within the range x - 80 to x + 19. The value 638 * itself is then used as a match against the two last digits of one of these 639 * years. For example, take x to be 2004. A two-digit year is assumed to fall 640 * within the range x - 80 (1924) and x + 19 (2023). Thus, any intepreted value 641 * between 0 and 23 is assumed to be 2000 to 2023 and values between 24 and 99 642 * are taken as being 1924 to 1999. This only applies for the case of 2004. 643 * With a different year, the values will be interpreted differently. 2005 644 * will used 0 to 24 as 2000 to 2024 and 25 to 99 as 1925 to 1999, for example. 645 * This behaviour differs from that of <code>SimpleDateFormat</code> and is 646 * time-dependent (a two-digit year will be interpreted differently depending 647 * on the time the code is run). 648 * </li> 649 * <li> 650 * Numbers followed by a colon are interpreted by first an hour, and then 651 * as a minute, once an hour has been found. 652 * </li> 653 * <li> 654 * <li> 655 * Numbers followed by a slash are regarded first as a month, and then as 656 * a day of the month once the month has been found. This follows the 657 * U.S. date format of mm/dd, rather than the European dd/mm. Months 658 * are converted to the recognised value - 1 before storage, in order 659 * to put the number within the range 0 to 11. 660 * </li> 661 * <li> 662 * Numbers followed by commas, whitespace, hyphens or the end of the string 663 * are interpreted in the following order: hour, minute, second, day of month. 664 * The first type not already recognised in the current string being parsed is 665 * assumed. 666 * </li> 667 * </ul> 668 * </p> 669 * <p> 670 * A sequence of consecutive alphabetic characters is recognised as a word, 671 * and interpreted as follows, in a case-insentive fashion: 672 * <ul> 673 * <li> 674 * The characters 'AM' or 'PM' restrict the hour value to a value between 0 675 * and 12. In the latter case, 12 is added to the hour value before storage. 676 * </li> 677 * <li> 678 * Any words which match any prefix of one of the days of the week ('Monday', 679 * 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday' and 'Sunday'), 680 * are simply ignored. 681 * </li> 682 * <li> 683 * Any words which match any prefix of one of the months of the year ('January', 684 * 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 685 * 'October', 'November', 'December') are recognised and interpreted as the 686 * appropriate value between 0 and 11. The first match made against a 687 * month is the one used, in the order specified here. For example, 'Ma' is 688 * intepreted as 'March' (2) and not as 'May' (4). Similarly, 'Ju' is 'June', 689 * and not 'July'. 690 * </li> 691 * <li> 692 * The words 'GMT', 'UT' and 'UTC' are interpreted as specifying UTC as the 693 * time zone in use for this date. 694 * </li> 695 * <li> 696 * The word pairs 'EST'/'EDT', 'CST'/'CDT', 'MST'/'MDT' and 'PST'/'PDT' are 697 * interpreted as the appropriate U.S. time zone abbreviation. Each pair 698 * is the standard and daylight savings time zone specification, respectively, 699 * for each zone within the U.S, these being Eastern Standard/Daylight Time 700 * (-5), Central Standard/Daylight Time (-6), Mountain Standard/Daylight Time 701 * (-7) and Pacific Standard/Daylight Time (-8). 702 * </li> 703 * </ul> 704 * 705 * @param string The String to parse. 706 * @return The time in milliseconds since the epoch. 707 * @throws IllegalArgumentException if the string fails to parse. 708 * @deprecated Use DateFormat.parse(String) 709 * @see #toString() 710 * @see SimpleDateFormat 711 */ 712 public static long parse(String string) 713 { 714 // Initialize date/time fields before parsing begins. 715 int year = -1; 716 int month = -1; 717 int day = -1; 718 int hour = -1; 719 int minute = -1; 720 int second = -1; 721 int timezone = 0; 722 boolean localTimezone = true; 723 724 // Trim out any nested stuff in parentheses now to make parsing easier. 725 StringBuffer buf = new StringBuffer(); 726 int parenNesting = 0; 727 int len = string.length(); 728 for (int i = 0; i < len; i++) 729 { 730 char ch = string.charAt(i); 731 if (ch >= 'a' && ch <= 'z') 732 ch -= 'a' - 'A'; 733 if (ch == '(') 734 parenNesting++; 735 else if (parenNesting == 0) 736 buf.append(ch); 737 else if (ch == ')') 738 parenNesting--; 739 } 740 int tmpMonth; 741 742 // Make all chars upper case to simplify comparisons later. 743 // Also ignore commas; treat them as delimiters. 744 StringTokenizer strtok = new StringTokenizer(buf.toString(), " \t\n\r,"); 745 746 while (strtok.hasMoreTokens()) 747 { 748 String tok = strtok.nextToken(); 749 char firstch = tok.charAt(0); 750 if ((firstch == '+' || firstch == '-') && year >= 0) 751 { 752 timezone = parseTz(tok, firstch); 753 localTimezone = false; 754 } 755 else if (firstch >= '0' && firstch <= '9') 756 { 757 int lastPunct = -1; 758 while (tok != null && tok.length() > 0) 759 { 760 int punctOffset = tok.length(); 761 int num = 0; 762 int punct; 763 for (int i = 0; ; i++) 764 { 765 if (i >= punctOffset) 766 { 767 punct = -1; 768 break; 769 } 770 else 771 { 772 punct = tok.charAt(i); 773 if (punct >= '0' && punct <= '9') 774 { 775 if (num > 999999999) // in case of overflow 776 throw new IllegalArgumentException(tok); 777 num = 10 * num + (punct - '0'); 778 } 779 else 780 { 781 punctOffset = i; 782 break; 783 } 784 } 785 786 } 787 788 if (punct == ':') 789 { 790 if (hour < 0) 791 hour = num; 792 else 793 minute = num; 794 } 795 else if (lastPunct == ':' && hour >= 0 && (minute < 0 || second < 0)) 796 { 797 if (minute < 0) 798 minute = num; 799 else 800 second = num; 801 } 802 else if ((num >= 70 803 && (punct == ' ' || punct == ',' 804 || punct == '/' || punct < 0)) 805 || (num < 70 && day >= 0 && month >= 0 && year < 0)) 806 { 807 if (num >= 100) 808 year = num; 809 else 810 { 811 int curYear = 1900 + new Date().getYear(); 812 int firstYear = curYear - 80; 813 year = firstYear / 100 * 100 + num; 814 if (year < firstYear) 815 year += 100; 816 } 817 } 818 else if (punct == '/') 819 { 820 if (month < 0) 821 month = num - 1; 822 else 823 day = num; 824 } 825 else if (hour >= 0 && minute < 0) 826 minute = num; 827 else if (minute >= 0 && second < 0) 828 second = num; 829 else if (day < 0) 830 day = num; 831 else 832 throw new IllegalArgumentException(tok); 833 834 // Advance string if there's more to process in this token. 835 if (punct < 0 || punctOffset + 1 >= tok.length()) 836 tok = null; 837 else 838 tok = tok.substring(punctOffset + 1); 839 lastPunct = punct; 840 } 841 } 842 else if (firstch >= 'A' && firstch <= 'Z') 843 { 844 if (tok.equals("AM")) 845 { 846 if (hour < 1 || hour > 12) 847 throw new IllegalArgumentException(tok); 848 if (hour == 12) 849 hour = 0; 850 } 851 else if (tok.equals("PM")) 852 { 853 if (hour < 1 || hour > 12) 854 throw new IllegalArgumentException(tok); 855 if (hour < 12) 856 hour += 12; 857 } 858 else if (parseDayOfWeek(tok)) 859 { /* Ignore it; throw the token away. */ } 860 else if (tok.equals("UT") || tok.equals("UTC") || tok.equals("GMT")) 861 localTimezone = false; 862 else if (tok.startsWith("UT") || tok.startsWith("GMT")) 863 { 864 int signOffset = 3; 865 if (tok.charAt(1) == 'T' && tok.charAt(2) != 'C') 866 signOffset = 2; 867 868 char sign = tok.charAt(signOffset); 869 if (sign != '+' && sign != '-') 870 throw new IllegalArgumentException(tok); 871 872 timezone = parseTz(tok.substring(signOffset), sign); 873 localTimezone = false; 874 } 875 else if ((tmpMonth = parseMonth(tok)) >= 0) 876 month = tmpMonth; 877 else if (tok.length() == 3 && tok.charAt(2) == 'T') 878 { 879 // Convert timezone offset from hours to minutes. 880 char ch = tok.charAt(0); 881 if (ch == 'E') 882 timezone = -5 * 60; 883 else if (ch == 'C') 884 timezone = -6 * 60; 885 else if (ch == 'M') 886 timezone = -7 * 60; 887 else if (ch == 'P') 888 timezone = -8 * 60; 889 else 890 throw new IllegalArgumentException(tok); 891 892 // Shift 60 minutes for Daylight Savings Time. 893 if (tok.charAt(1) == 'D') 894 timezone += 60; 895 else if (tok.charAt(1) != 'S') 896 throw new IllegalArgumentException(tok); 897 898 localTimezone = false; 899 } 900 else 901 throw new IllegalArgumentException(tok); 902 } 903 else 904 throw new IllegalArgumentException(tok); 905 } 906 907 // Unspecified hours, minutes, or seconds should default to 0. 908 if (hour < 0) 909 hour = 0; 910 if (minute < 0) 911 minute = 0; 912 if (second < 0) 913 second = 0; 914 915 // Throw exception if any other fields have not been recognized and set. 916 if (year < 0 || month < 0 || day < 0) 917 throw new IllegalArgumentException("Missing field"); 918 919 // Return the time in either local time or relative to GMT as parsed. 920 // If no time-zone was specified, get the local one (in minutes) and 921 // convert to milliseconds before adding to the UTC. 922 GregorianCalendar cal 923 = new GregorianCalendar(year, month, day, hour, minute, second); 924 if (!localTimezone) 925 { 926 cal.set(Calendar.ZONE_OFFSET, timezone * 60 * 1000); 927 cal.set(Calendar.DST_OFFSET, 0); 928 } 929 return cal.getTimeInMillis(); 930 } 931 932 /** 933 * Returns the difference between the year represented by this 934 * <code>Date</code> object and 1900. 935 * 936 * @return the year minus 1900 represented by this date object. 937 * @deprecated Use Calendar instead of Date, and use get(Calendar.YEAR) 938 * instead. Note the 1900 difference in the year. 939 * @see Calendar 940 * @see #setYear(int) 941 */ 942 public int getYear() 943 { 944 Calendar cal = Calendar.getInstance(); 945 cal.setTimeInMillis(time); 946 return cal.get(Calendar.YEAR) - 1900; 947 } 948 949 /** 950 * Sets the year to the specified year, plus 1900. The other 951 * fields are only altered as required to match the same date 952 * and time in the new year. Usually, this will mean that 953 * the fields are not changed at all, but in the case of 954 * a leap day or leap second, the fields will change in 955 * relation to the existence of such an event in the new year. 956 * For example, if the date specifies February the 29th, 2000, 957 * then this will become March the 1st if the year is changed 958 * to 2001, as 2001 is not a leap year. Similarly, a seconds 959 * value of 60 or 61 may result in the seconds becoming 0 and 960 * the minute increasing by 1, if the new time does not include 961 * a leap second. 962 * 963 * @param year the year minus 1900. 964 * @deprecated Use Calendar instead of Date, and use 965 * set(Calendar.YEAR, year) instead. Note about the 1900 966 * difference in year. 967 * @see #getYear() 968 * @see Calendar 969 */ 970 public void setYear(int year) 971 { 972 Calendar cal = Calendar.getInstance(); 973 cal.setTimeInMillis(time); 974 cal.set(Calendar.YEAR, 1900 + year); 975 time = cal.getTimeInMillis(); 976 } 977 978 /** 979 * Returns the month represented by this <code>Date</code> object, 980 * as a value between 0 (January) and 11 (December). 981 * 982 * @return the month represented by this date object (zero based). 983 * @deprecated Use Calendar instead of Date, and use get(Calendar.MONTH) 984 * instead. 985 * @see #setMonth(int) 986 * @see Calendar 987 */ 988 public int getMonth() 989 { 990 Calendar cal = Calendar.getInstance(); 991 cal.setTimeInMillis(time); 992 return cal.get(Calendar.MONTH); 993 } 994 995 /** 996 * Sets the month to the given value. The other 997 * fields are only altered as necessary to match 998 * the same date and time in the new month. In most 999 * cases, the other fields won't change at all. However, 1000 * in the case of a shorter month or a leap second, values 1001 * may be adjusted. For example, if the day of the month 1002 * is currently 31, and the month value is changed from 1003 * January (0) to September (8), the date will become 1004 * October the 1st, as September only has 30 days. Similarly, 1005 * a seconds value of 60 or 61 (a leap second) may result 1006 * in the seconds value being reset to 0 and the minutes 1007 * value being incremented by 1, if the new time does 1008 * not include a leap second. 1009 * 1010 * @param month the month, with a zero-based index 1011 * from January. 1012 * @deprecated Use Calendar instead of Date, and use 1013 * set(Calendar.MONTH, month) instead. 1014 * @see #getMonth() 1015 * @see Calendar 1016 */ 1017 public void setMonth(int month) 1018 { 1019 Calendar cal = Calendar.getInstance(); 1020 cal.setTimeInMillis(time); 1021 cal.set(Calendar.MONTH, month); 1022 time = cal.getTimeInMillis(); 1023 } 1024 1025 /** 1026 * Returns the day of the month of this <code>Date</code> 1027 * object, as a value between 0 and 31. 1028 * 1029 * @return the day of month represented by this date object. 1030 * @deprecated Use Calendar instead of Date, and use get(Calendar.DATE) 1031 * instead. 1032 * @see Calendar 1033 * @see #setDate(int) 1034 */ 1035 public int getDate() 1036 { 1037 Calendar cal = Calendar.getInstance(); 1038 cal.setTimeInMillis(time); 1039 return cal.get(Calendar.DATE); 1040 } 1041 1042 /** 1043 * Sets the date to the given value. The other 1044 * fields are only altered as necessary to match 1045 * the same date and time on the new day of the month. In most 1046 * cases, the other fields won't change at all. However, 1047 * in the case of a leap second or the day being out of 1048 * the range of the current month, values 1049 * may be adjusted. For example, if the day of the month 1050 * is currently 30 and the month is June, a new day of the 1051 * month value of 31 will cause the month to change to July, 1052 * as June only has 30 days . Similarly, 1053 * a seconds value of 60 or 61 (a leap second) may result 1054 * in the seconds value being reset to 0 and the minutes 1055 * value being incremented by 1, if the new time does 1056 * not include a leap second. 1057 * 1058 * @param date the date. 1059 * @deprecated Use Calendar instead of Date, and use 1060 * set(Calendar.DATE, date) instead. 1061 * @see Calendar 1062 * @see #getDate() 1063 */ 1064 public void setDate(int date) 1065 { 1066 Calendar cal = Calendar.getInstance(); 1067 cal.setTimeInMillis(time); 1068 cal.set(Calendar.DATE, date); 1069 time = cal.getTimeInMillis(); 1070 } 1071 1072 /** 1073 * Returns the day represented by this <code>Date</code> 1074 * object as an integer between 0 (Sunday) and 6 (Saturday). 1075 * 1076 * @return the day represented by this date object. 1077 * @deprecated Use Calendar instead of Date, and use get(Calendar.DAY_OF_WEEK) 1078 * instead. 1079 * @see Calendar 1080 */ 1081 public int getDay() 1082 { 1083 Calendar cal = Calendar.getInstance(); 1084 cal.setTimeInMillis(time); 1085 // For Calendar, Sunday is 1. For Date, Sunday is 0. 1086 return cal.get(Calendar.DAY_OF_WEEK) - 1; 1087 } 1088 1089 /** 1090 * Returns the hours represented by this <code>Date</code> 1091 * object as an integer between 0 and 23. 1092 * 1093 * @return the hours represented by this date object. 1094 * @deprecated Use Calendar instead of Date, and use get(Calendar.HOUR_OF_DAY) 1095 * instead. 1096 * @see Calendar 1097 * @see #setHours(int) 1098 */ 1099 public int getHours() 1100 { 1101 Calendar cal = Calendar.getInstance(); 1102 cal.setTimeInMillis(time); 1103 return cal.get(Calendar.HOUR_OF_DAY); 1104 } 1105 1106 /** 1107 * Sets the hours to the given value. The other 1108 * fields are only altered as necessary to match 1109 * the same date and time in the new hour. In most 1110 * cases, the other fields won't change at all. However, 1111 * in the case of a leap second, values 1112 * may be adjusted. For example, 1113 * a seconds value of 60 or 61 (a leap second) may result 1114 * in the seconds value being reset to 0 and the minutes 1115 * value being incremented by 1 if the new hour does 1116 * not contain a leap second. 1117 * 1118 * @param hours the hours. 1119 * @deprecated Use Calendar instead of Date, and use 1120 * set(Calendar.HOUR_OF_DAY, hours) instead. 1121 * @see Calendar 1122 * @see #getHours() 1123 */ 1124 public void setHours(int hours) 1125 { 1126 Calendar cal = Calendar.getInstance(); 1127 cal.setTimeInMillis(time); 1128 cal.set(Calendar.HOUR_OF_DAY, hours); 1129 time = cal.getTimeInMillis(); 1130 } 1131 1132 /** 1133 * Returns the number of minutes represented by the <code>Date</code> 1134 * object, as an integer between 0 and 59. 1135 * 1136 * @return the minutes represented by this date object. 1137 * @deprecated Use Calendar instead of Date, and use get(Calendar.MINUTE) 1138 * instead. 1139 * @see Calendar 1140 * @see #setMinutes(int) 1141 */ 1142 public int getMinutes() 1143 { 1144 Calendar cal = Calendar.getInstance(); 1145 cal.setTimeInMillis(time); 1146 return cal.get(Calendar.MINUTE); 1147 } 1148 1149 /** 1150 * Sets the minutes to the given value. The other 1151 * fields are only altered as necessary to match 1152 * the same date and time in the new minute. In most 1153 * cases, the other fields won't change at all. However, 1154 * in the case of a leap second, values 1155 * may be adjusted. For example, 1156 * a seconds value of 60 or 61 (a leap second) may result 1157 * in the seconds value being reset to 0 and the minutes 1158 * value being incremented by 1 if the new minute does 1159 * not contain a leap second. 1160 * 1161 * @param minutes the minutes. 1162 * @deprecated Use Calendar instead of Date, and use 1163 * set(Calendar.MINUTE, minutes) instead. 1164 * @see Calendar 1165 * @see #getMinutes() 1166 */ 1167 public void setMinutes(int minutes) 1168 { 1169 Calendar cal = Calendar.getInstance(); 1170 cal.setTimeInMillis(time); 1171 cal.set(Calendar.MINUTE, minutes); 1172 time = cal.getTimeInMillis(); 1173 } 1174 1175 /** 1176 * Returns the number of seconds represented by the <code>Date</code> 1177 * object, as an integer between 0 and 61 (60 and 61 being leap seconds). 1178 * 1179 * @return the seconds represented by this date object. 1180 * @deprecated Use Calendar instead of Date, and use get(Calendar.SECOND) 1181 * instead. 1182 * @see Calendar 1183 * @see #setSeconds(int) 1184 */ 1185 public int getSeconds() 1186 { 1187 Calendar cal = Calendar.getInstance(); 1188 cal.setTimeInMillis(time); 1189 return cal.get(Calendar.SECOND); 1190 } 1191 1192 /** 1193 * Sets the seconds to the given value. The other 1194 * fields are only altered as necessary to match 1195 * the same date and time in the new minute. In most 1196 * cases, the other fields won't change at all. However, 1197 * in the case of a leap second, values 1198 * may be adjusted. For example, setting the 1199 * seconds value to 60 or 61 (a leap second) may result 1200 * in the seconds value being reset to 0 and the minutes 1201 * value being incremented by 1, if the current time does 1202 * not contain a leap second. 1203 * 1204 * @param seconds the seconds. 1205 * @deprecated Use Calendar instead of Date, and use 1206 * set(Calendar.SECOND, seconds) instead. 1207 * @see Calendar 1208 * @see #getSeconds() 1209 */ 1210 public void setSeconds(int seconds) 1211 { 1212 Calendar cal = Calendar.getInstance(); 1213 cal.setTimeInMillis(time); 1214 cal.set(Calendar.SECOND, seconds); 1215 time = cal.getTimeInMillis(); 1216 } 1217 1218 /** 1219 * Deserializes a <code>Date</code> object from an 1220 * input stream, setting the time (in milliseconds 1221 * since the epoch) to the long value read from the 1222 * stream. 1223 * 1224 * @param input the input stream. 1225 * @throws IOException if an I/O error occurs in the stream. 1226 * @throws ClassNotFoundException if the class of the 1227 * serialized object could not be found. 1228 */ 1229 private void readObject(ObjectInputStream input) 1230 throws IOException, ClassNotFoundException 1231 { 1232 input.defaultReadObject(); 1233 time = input.readLong(); 1234 } 1235 1236 /** 1237 * Serializes a <code>Date</code> object to an output stream, 1238 * storing the time (in milliseconds since the epoch) as a long 1239 * value in the stream. 1240 * 1241 * @serialdata A long value representing the offset from the epoch 1242 * in milliseconds. This is the same value that is returned by the 1243 * method getTime(). 1244 * @param output the output stream. 1245 * @throws IOException if an I/O error occurs in the stream. 1246 */ 1247 private void writeObject(ObjectOutputStream output) 1248 throws IOException 1249 { 1250 output.defaultWriteObject(); 1251 output.writeLong(time); 1252 } 1253 1254 }