/*
* @(#)Date.java 1.76 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.util;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.lang.ref.SoftReference;
/**
* The class <code>Date</code> represents a specific instant
* in time, with millisecond precision.
* <p>
* Prior to JDK 1.1, the class <code>Date</code> had two additional
* functions. It allowed the interpretation of dates as year, month, day, hour,
* minute, and second values. It also allowed the formatting and parsing
* of date strings. Unfortunately, the API for these functions was not
* amenable to internationalization. As of JDK 1.1, the
* <code>Calendar</code> class should be used to convert between dates and time
* fields and the <code>DateFormat</code> class should be used to format and
* parse date strings.
* The corresponding methods in <code>Date</code> are deprecated.
* <p>
* Although the <code>Date</code> class is intended to reflect
* coordinated universal time (UTC), it may not do so exactly,
* depending on the host environment of the Java Virtual Machine.
* Nearly all modern operating systems assume that 1 day =
* 24 × 60 × 60 = 86400 seconds
* in all cases. In UTC, however, about once every year or two there
* is an extra second, called a "leap second." The leap
* second is always added as the last second of the day, and always
* on December 31 or June 30. For example, the last minute of the
* year 1995 was 61 seconds long, thanks to an added leap second.
* Most computer clocks are not accurate enough to be able to reflect
* the leap-second distinction.
* <p>
* Some computer standards are defined in terms of Greenwich mean
* time (GMT), which is equivalent to universal time (UT). GMT is
* the "civil" name for the standard; UT is the
* "scientific" name for the same standard. The
* distinction between UTC and UT is that UTC is based on an atomic
* clock and UT is based on astronomical observations, which for all
* practical purposes is an invisibly fine hair to split. Because the
* earth's rotation is not uniform (it slows down and speeds up
* in complicated ways), UT does not always flow uniformly. Leap
* seconds are introduced as needed into UTC so as to keep UTC within
* 0.9 seconds of UT1, which is a version of UT with certain
* corrections applied. There are other time and date systems as
* well; for example, the time scale used by the satellite-based
* global positioning system (GPS) is synchronized to UTC but is
* <i>not</i> adjusted for leap seconds. An interesting source of
* further information is the U.S. Naval Observatory, particularly
* the Directorate of Time at:
* <blockquote><pre>
* <a href=http://tycho.usno.navy.mil>http://tycho.usno.navy.mil</a>
* </pre></blockquote>
* <p>
* and their definitions of "Systems of Time" at:
* <blockquote><pre>
* <a href=http://tycho.usno.navy.mil/systime.html>http://tycho.usno.navy.mil/systime.html</a>
* </pre></blockquote>
* <p>
* In all methods of class <code>Date</code> that accept or return
* year, month, date, hours, minutes, and seconds values, the
* following representations are used:
* <ul>
* <li>A year <i>y</i> is represented by the integer
* <i>y</i> <code>- 1900</code>.
* <li>A month is represented by an integer from 0 to 11; 0 is January,
* 1 is February, and so forth; thus 11 is December.
* <li>A date (day of month) is represented by an integer from 1 to 31
* in the usual manner.
* <li>An hour is represented by an integer from 0 to 23. Thus, the hour
* from midnight to 1 a.m. is hour 0, and the hour from noon to 1
* p.m. is hour 12.
* <li>A minute is represented by an integer from 0 to 59 in the usual manner.
* <li>A second is represented by an integer from 0 to 61; the values 60 and
* 61 occur only for leap seconds and even then only in Java
* implementations that actually track leap seconds correctly. Because
* of the manner in which leap seconds are currently introduced, it is
* extremely unlikely that two leap seconds will occur in the same
* minute, but this specification follows the date and time conventions
* for ISO C.
* </ul>
* <p>
* In all cases, arguments given to methods for these purposes need
* not fall within the indicated ranges; for example, a date may be
* specified as January 32 and is interpreted as meaning February 1.
*
* @author James Gosling
* @author Arthur van Hoff
* @author Alan Liu
* @version 1.70 11/09/00
* @see java.text.DateFormat
* @see java.util.Calendar
* @see java.util.TimeZone
* @since JDK1.0
*/
public class Date implements java.io.Serializable, Cloneable, Comparable {
/* DEFAULT ZONE SYNCHRONIZATION: Part of the usage model of Date
* is that a Date object behaves like a Calendar object whose zone
* is the current default TimeZone. As a result, we must be
* careful about keeping this phantom calendar in sync with the
* default TimeZone. There are three class and instance variables
* to watch out for to achieve this. (1)staticCal. Whenever this
* object is used, it must be reset to the default zone. This is a
* cheap operation which can be done directly (just a reference
* assignment), so we just do it every time. (2)simpleFormatter.
* Likewise, the DateFormat object we use to implement toString()
* must be reset to the current default zone before use. Again,
* this is a cheap reference assignment. (3)cal.
* Unlike the other cached static objects, cal has
* state, and we don't want to monkey with it willy-nilly. The
* correct procedure is to change the zone in a way that doesn't
* alter the time of this object. This means getting the millis
* (forcing a fields->time conversion), setting the zone, and then
* restoring the millis. The zone must be set before restoring
* the millis. Since this is an expensive operation, we only do
* this when we have to. - liu 1.2b4 */
/* If cal is null, then fastTime indicates the time in millis.
* Otherwise, fastTime is ignored, and cal indicates the time.
* The cal object is only created if a setXxx call is made to
* set a field. For other operations, staticCal is used instead.
*/
private transient Calendar cal;
private transient long fastTime;
private static Calendar staticCal = null;
private static Calendar utcCal = null;
private static int defaultCenturyStart = 0;
/* use serialVersionUID from modified java.util.Date for
* interoperability with JDK1.1. The Date was modified to write
* and read only the UTC time.
*/
private static final long serialVersionUID = 7523967970034938905L;
/**
* Caches for the DateFormatters used by various toString methods.
*/
private static SoftReference simpleFormatter = null;
private static SoftReference gmtFormatter = null;
/**
* Allocates a <code>Date</code> object and initializes it so that
* it represents the time at which it was allocated, measured to the
* nearest millisecond.
*
* @see java.lang.System#currentTimeMillis()
*/
public Date() {
this(System.currentTimeMillis());
}
/**
* Allocates a <code>Date</code> object and initializes it to
* represent the specified number of milliseconds since the
* standard base time known as "the epoch", namely January 1,
* 1970, 00:00:00 GMT.
*
* @param date the milliseconds since January 1, 1970, 00:00:00 GMT.
* @see java.lang.System#currentTimeMillis()
*/
public Date(long date) {
cal = null;
fastTime = date;
}
/**
* Allocates a <code>Date</code> object and initializes it so that
* it represents midnight, local time, at the beginning of the day
* specified by the <code>year</code>, <code>month</code>, and
* <code>date</code> arguments.
*
* param year the year minus 1900.
* param month the month between 0-11.
* param date the day of the month between 1-31.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(year + 1900, month, date)</code>
* or <code>GregorianCalendar(year + 1900, month, date)</code>.
*
public Date(int year, int month, int date) {
this(year, month, date, 0, 0, 0);
}
*/
/**
* Allocates a <code>Date</code> object and initializes it so that
* it represents the instant at the start of the minute specified by
* the <code>year</code>, <code>month</code>, <code>date</code>,
* <code>hrs</code>, and <code>min</code> arguments, in the local
* time zone.
*
* param year the year minus 1900.
* param month the month between 0-11.
* param date the day of the month between 1-31.
* param hrs the hours between 0-23.
* param min the minutes between 0-59.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(year + 1900, month, date,
* hrs, min)</code> or <code>GregorianCalendar(year + 1900,
* month, date, hrs, min)</code>.
*
public Date(int year, int month, int date, int hrs, int min) {
this(year, month, date, hrs, min, 0);
}
*/
/**
* Allocates a <code>Date</code> object and initializes it so that
* it represents the instant at the start of the second specified
* by the <code>year</code>, <code>month</code>, <code>date</code>,
* <code>hrs</code>, <code>min</code>, and <code>sec</code> arguments,
* in the local time zone.
*
* param year the year minus 1900.
* param month the month between 0-11.
* param date the day of the month between 1-31.
* param hrs the hours between 0-23.
* param min the minutes between 0-59.
* param sec the seconds between 0-59.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(year + 1900, month, date,
* hrs, min, sec)</code> or <code>GregorianCalendar(year + 1900,
* month, date, hrs, min, sec)</code>.
*
public Date(int year, int month, int date, int hrs, int min, int sec) {
cal = null;
if (staticCal == null)
makeStaticCalendars();
synchronized (staticCal) {
staticCal.setTimeZone(TimeZone.getDefault());
staticCal.clear();
staticCal.set(year + 1900, month, date, hrs, min, sec);
fastTime = staticCal.getTimeInMillis();
}
}
*/
/**
* Allocates a <code>Date</code> object and initializes it so that
* it represents the date and time indicated by the string
* <code>s</code>, which is interpreted as if by the
* {link Date#parse} method.
*
* param s a string representation of the date.
* see java.text.DateFormat
* see java.util.Date#parse(java.lang.String)
* deprecated As of JDK version 1.1,
* replaced by <code>DateFormat.parse(String s)</code>.
*
public Date(String s) {
this(parse(s));
}
*/
/**
* Return a copy of this object.
*/
public Object clone() {
Date d = null;
try {
d = (Date)super.clone();
if (d.cal != null) d.cal = (Calendar)d.cal.clone();
} catch (CloneNotSupportedException e) {} // Won't happen
return d;
}
/**
* Determines the date and time based on the arguments. The
* arguments are interpreted as a year, month, day of the month,
* hour of the day, minute within the hour, and second within the
* minute, exactly as for the <tt>Date</tt> constructor with six
* arguments, except that the arguments are interpreted relative
* to UTC rather than to the local time zone. The time indicated is
* returned represented as the distance, measured in milliseconds,
* of that time from the epoch (00:00:00 GMT on January 1, 1970).
*
* param year the year minus 1900.
* param month the month between 0-11.
* param date the day of the month between 1-31.
* param hrs the hours between 0-23.
* param min the minutes between 0-59.
* param sec the seconds between 0-59.
* return the number of milliseconds since January 1, 1970, 00:00:00 GMT for
* the date and time specified by the arguments.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(year + 1900, month, date,
* hrs, min, sec)</code> or <code>GregorianCalendar(year + 1900,
* month, date, hrs, min, sec)</code>, using a UTC
* <code>TimeZone</code>, followed by <code>Calendar.getTime().getTime()</code>.
*
public static long UTC(int year, int month, int date,
int hrs, int min, int sec) {
if (utcCal == null)
makeStaticCalendars();
synchronized (utcCal) {
utcCal.clear();
utcCal.set(year + 1900, month, date, hrs, min, sec);
return utcCal.getTimeInMillis();
}
}
*/
/**
* Attempts to interpret the string <tt>s</tt> as a representation
* of a date and time. If the attempt is successful, the time
* indicated is returned represented as the distance, measured in
* milliseconds, of that time from the epoch (00:00:00 GMT on
* January 1, 1970). If the attempt fails, an
* <tt>IllegalArgumentException</tt> is thrown.
* <p>
* It accepts many syntaxes; in particular, it recognizes the IETF
* standard date syntax: "Sat, 12 Aug 1995 13:30:00 GMT". It also
* understands the continental U.S. time-zone abbreviations, but for
* general use, a time-zone offset should be used: "Sat, 12 Aug 1995
* 13:30:00 GMT+0430" (4 hours, 30 minutes west of the Greenwich
* meridian). If no time zone is specified, the local time zone is
* assumed. GMT and UTC are considered equivalent.
* <p>
* The string <tt>s</tt> is processed from left to right, looking for
* data of interest. Any material in <tt>s</tt> that is within the
* ASCII parenthesis characters <tt>(</tt> and <tt>)</tt> is ignored.
* Parentheses may be nested. Otherwise, the only characters permitted
* within <tt>s</tt> are these ASCII characters:
* <blockquote><pre>
* abcdefghijklmnopqrstuvwxyz
* ABCDEFGHIJKLMNOPQRSTUVWXYZ
* 0123456789,+-:/</pre></blockquote>
* and whitespace characters.<p>
* A consecutive sequence of decimal digits is treated as a decimal
* number:<ul>
* <li>If a number is preceded by <tt>+</tt> or <tt>-</tt> and a year
* has already been recognized, then the number is a time-zone
* offset. If the number is less than 24, it is an offset measured
* in hours. Otherwise, it is regarded as an offset in minutes,
* expressed in 24-hour time format without punctuation. A
* preceding <tt>-</tt> means a westward offset. Time zone offsets
* are always relative to UTC (Greenwich). Thus, for example,
* <tt>-5</tt> occurring in the string would mean "five hours west
* of Greenwich" and <tt>+0430</tt> would mean "four hours and
* thirty minutes east of Greenwich." It is permitted for the
* string to specify <tt>GMT</tt>, <tt>UT</tt>, or <tt>UTC</tt>
* redundantly-for example, <tt>GMT-5</tt> or <tt>utc+0430</tt>.
* <li>The number is regarded as a year number if one of the
* following conditions is true:
* <ul>
* <li>The number is equal to or greater than 70 and followed by a
* space, comma, slash, or end of string
* <li>The number is less than 70, and both a month and a day of
* the month have already been recognized</li>
* </ul>
* If the recognized year number is less than 100, it is
* interpreted as an abbreviated year relative to a century of
* which dates are within 80 years before and 19 years after
* the time when the Date class is initialized.
* After adjusting the year number, 1900 is subtracted from
* it. For example, if the current year is 1999 then years in
* the range 19 to 99 are assumed to mean 1919 to 1999, while
* years from 0 to 18 are assumed to mean 2000 to 2018. Note
* that this is slightly different from the interpretation of
* years less than 100 that is used in {@link java.text.SimpleDateFormat}.
* <li>If the number is followed by a colon, it is regarded as an hour,
* unless an hour has already been recognized, in which case it is
* regarded as a minute.
* <li>If the number is followed by a slash, it is regarded as a month
* (it is decreased by 1 to produce a number in the range <tt>0</tt>
* to <tt>11</tt>), unless a month has already been recognized, in
* which case it is regarded as a day of the month.
* <li>If the number is followed by whitespace, a comma, a hyphen, or
* end of string, then if an hour has been recognized but not a
* minute, it is regarded as a minute; otherwise, if a minute has
* been recognized but not a second, it is regarded as a second;
* otherwise, it is regarded as a day of the month. </ul><p>
* A consecutive sequence of letters is regarded as a word and treated
* as follows:<ul>
* <li>A word that matches <tt>AM</tt>, ignoring case, is ignored (but
* the parse fails if an hour has not been recognized or is less
* than <tt>1</tt> or greater than <tt>12</tt>).
* <li>A word that matches <tt>PM</tt>, ignoring case, adds <tt>12</tt>
* to the hour (but the parse fails if an hour has not been
* recognized or is less than <tt>1</tt> or greater than <tt>12</tt>).
* <li>Any word that matches any prefix of <tt>SUNDAY, MONDAY, TUESDAY,
* WEDNESDAY, THURSDAY, FRIDAY</tt>, or <tt>SATURDAY</tt>, ignoring
* case, is ignored. For example, <tt>sat, Friday, TUE</tt>, and
* <tt>Thurs</tt> are ignored.
* <li>Otherwise, any word that matches any prefix of <tt>JANUARY,
* FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER,
* OCTOBER, NOVEMBER</tt>, or <tt>DECEMBER</tt>, ignoring case, and
* considering them in the order given here, is recognized as
* specifying a month and is converted to a number (<tt>0</tt> to
* <tt>11</tt>). For example, <tt>aug, Sept, april</tt>, and
* <tt>NOV</tt> are recognized as months. So is <tt>Ma</tt>, which
* is recognized as <tt>MARCH</tt>, not <tt>MAY</tt>.
* <li>Any word that matches <tt>GMT, UT</tt>, or <tt>UTC</tt>, ignoring
* case, is treated as referring to UTC.
* <li>Any word that matches <tt>EST, CST, MST</tt>, or <tt>PST</tt>,
* ignoring case, is recognized as referring to the time zone in
* North America that is five, six, seven, or eight hours west of
* Greenwich, respectively. Any word that matches <tt>EDT, CDT,
* MDT</tt>, or <tt>PDT</tt>, ignoring case, is recognized as
* referring to the same time zone, respectively, during daylight
* saving time.</ul><p>
* Once the entire string s has been scanned, it is converted to a time
* result in one of two ways. If a time zone or time-zone offset has been
* recognized, then the year, month, day of month, hour, minute, and
* second are interpreted in UTC and then the time-zone offset is
* applied. Otherwise, the year, month, day of month, hour, minute, and
* second are interpreted in the local time zone.
*
* param s a string to be parsed as a date.
* return the number of milliseconds since January 1, 1970, 00:00:00 GMT
* represented by the string argument.
* see java.text.DateFormat
* deprecated As of JDK version 1.1,
* replaced by <code>DateFormat.parse(String s)</code>.
*
public static long parse(String s) {
if (staticCal == null)
makeStaticCalendars(); // Called only for side-effect of setting defaultCenturyStart
int year = Integer.MIN_VALUE;
int mon = -1;
int mday = -1;
int hour = -1;
int min = -1;
int sec = -1;
int millis = -1;
int c = -1;
int i = 0;
int n = -1;
int wst = -1;
int tzoffset = -1;
int prevc = 0;
syntax:
{
if (s == null)
break syntax;
int limit = s.length();
while (i < limit) {
c = s.charAt(i);
i++;
if (c <= ' ' || c == ',')
continue;
if (c == '(') { // skip comments
int depth = 1;
while (i < limit) {
c = s.charAt(i);
i++;
if (c == '(') depth++;
else if (c == ')')
if (--depth <= 0)
break;
}
continue;
}
if ('0' <= c && c <= '9') {
n = c - '0';
while (i < limit && '0' <= (c = s.charAt(i)) && c <= '9') {
n = n * 10 + c - '0';
i++;
}
if (prevc == '+' || prevc == '-' && year != Integer.MIN_VALUE) {
// timezone offset
if (n < 24)
n = n * 60; // EG. "GMT-3"
else
n = n % 100 + n / 100 * 60; // eg "GMT-0430"
if (prevc == '+') // plus means east of GMT
n = -n;
if (tzoffset != 0 && tzoffset != -1)
break syntax;
tzoffset = n;
} else if (n >= 70)
if (year != Integer.MIN_VALUE)
break syntax;
else if (c <= ' ' || c == ',' || c == '/' || i >= limit)
// year = n < 1900 ? n : n - 1900;
year = n;
else
break syntax;
else if (c == ':')
if (hour < 0)
hour = (byte) n;
else if (min < 0)
min = (byte) n;
else
break syntax;
else if (c == '/')
if (mon < 0)
mon = (byte) (n - 1);
else if (mday < 0)
mday = (byte) n;
else
break syntax;
else if (i < limit && c != ',' && c > ' ' && c != '-')
break syntax;
else if (hour >= 0 && min < 0)
min = (byte) n;
else if (min >= 0 && sec < 0)
sec = (byte) n;
else if (mday < 0)
mday = (byte) n;
// Handle two-digit years < 70 (70-99 handled above).
else if (year == Integer.MIN_VALUE && mon >= 0 && mday >= 0)
year = n;
else
break syntax;
prevc = 0;
} else if (c == '/' || c == ':' || c == '+' || c == '-')
prevc = c;
else {
int st = i - 1;
while (i < limit) {
c = s.charAt(i);
if (!('A' <= c && c <= 'Z' || 'a' <= c && c <= 'z'))
break;
i++;
}
if (i <= st + 1)
break syntax;
int k;
for (k = wtb.length; --k >= 0;)
if (wtb[k].regionMatches(true, 0, s, st, i - st)) {
int action = ttb[k];
if (action != 0) {
if (action == 1) { // pm
if (hour > 12 || hour < 1)
break syntax;
else if (hour < 12)
hour += 12;
} else if (action == 14) { // am
if (hour > 12 || hour < 1)
break syntax;
else if (hour == 12)
hour = 0;
} else if (action <= 13) { // month!
if (mon < 0)
mon = (byte) (action - 2);
else
break syntax;
} else {
tzoffset = action - 10000;
}
}
break;
}
if (k < 0)
break syntax;
prevc = 0;
}
}
if (year == Integer.MIN_VALUE || mon < 0 || mday < 0)
break syntax;
// Parse 2-digit years within the correct default century.
if (year < 100) {
year += (defaultCenturyStart / 100) * 100;
if (year < defaultCenturyStart) year += 100;
}
year -= 1900;
if (sec < 0)
sec = 0;
if (min < 0)
min = 0;
if (hour < 0)
hour = 0;
if (tzoffset == -1) // no time zone specified, have to use local
return new Date (year, mon, mday, hour, min, sec).getTime();
return UTC(year, mon, mday, hour, min, sec) + tzoffset * (60 * 1000);
}
// syntax error
throw new IllegalArgumentException();
}
*/
private final static String wtb[] = {
"am", "pm",
"monday", "tuesday", "wednesday", "thursday", "friday",
"saturday", "sunday",
"january", "february", "march", "april", "may", "june",
"july", "august", "september", "october", "november", "december",
"gmt", "ut", "utc", "est", "edt", "cst", "cdt",
"mst", "mdt", "pst", "pdt"
// this time zone table needs to be expanded
};
private final static int ttb[] = {
14, 1, 0, 0, 0, 0, 0, 0, 0,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
10000 + 0, 10000 + 0, 10000 + 0, // GMT/UT/UTC
10000 + 5 * 60, 10000 + 4 * 60, // EST/EDT
10000 + 6 * 60, 10000 + 5 * 60,
10000 + 7 * 60, 10000 + 6 * 60,
10000 + 8 * 60, 10000 + 7 * 60
};
/**
* Returns a value that is the result of subtracting 1900 from the
* year that contains or begins with the instant in time represented
* by this <code>Date</code> object, as interpreted in the local
* time zone.
*
* return the year represented by this date, minus 1900.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.YEAR) - 1900</code>.
*
public int getYear() {
return getField(Calendar.YEAR) - 1900;
}
*/
/**
* Sets the year of this <tt>Date</tt> object to be the specified
* value plus 1900. This <code>Date</code> object is modified so
* that it represents a point in time within the specified year,
* with the month, date, hour, minute, and second the same as
* before, as interpreted in the local time zone. (Of course, if
* the date was February 29, for example, and the year is set to a
* non-leap year, then the new date will be treated as if it were
* on March 1.)
*
* param year the year value.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.YEAR, year + 1900)</code>.
*
public void setYear(int year) {
setField(Calendar.YEAR, year + 1900);
}
*/
/**
* Returns a number representing the month that contains or begins
* with the instant in time represented by this <tt>Date</tt> object.
* The value returned is between <code>0</code> and <code>11</code>,
* with the value <code>0</code> representing January.
*
* return the month represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.MONTH)</code>.
*
public int getMonth() {
return getField(Calendar.MONTH);
}
*/
/**
* Sets the month of this date to the specified value. This
* <tt>Date</tt> object is modified so that it represents a point
* in time within the specified month, with the year, date, hour,
* minute, and second the same as before, as interpreted in the
* local time zone. If the date was October 31, for example, and
* the month is set to June, then the new date will be treated as
* if it were on July 1, because June has only 30 days.
*
* param month the month value between 0-11.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.MONTH, int month)</code>.
*
public void setMonth(int month) {
setField(Calendar.MONTH, month);
}
*/
/**
* Returns the day of the month represented by this <tt>Date</tt> object.
* The value returned is between <code>1</code> and <code>31</code>
* representing the day of the month that contains or begins with the
* instant in time represented by this <tt>Date</tt> object, as
* interpreted in the local time zone.
*
* return the day of the month represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.DAY_OF_MONTH)</code>.
* deprecated
*
public int getDate() {
return getField(Calendar.DATE);
}
*/
/**
* Sets the day of the month of this <tt>Date</tt> object to the
* specified value. This <tt>Date</tt> object is modified so that
* it represents a point in time within the specified day of the
* month, with the year, month, hour, minute, and second the same
* as before, as interpreted in the local time zone. If the date
* was April 30, for example, and the date is set to 31, then it
* will be treated as if it were on May 1, because April has only
* 30 days.
*
* param date the day of the month value between 1-31.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.DAY_OF_MONTH, int date)</code>.
*
public void setDate(int date) {
setField(Calendar.DATE, date);
}
*/
/**
* Returns the day of the week represented by this date. The
* returned value (<tt>0</tt> = Sunday, <tt>1</tt> = Monday,
* <tt>2</tt> = Tuesday, <tt>3</tt> = Wednesday, <tt>4</tt> =
* Thursday, <tt>5</tt> = Friday, <tt>6</tt> = Saturday)
* represents the day of the week that contains or begins with
* the instant in time represented by this <tt>Date</tt> object,
* as interpreted in the local time zone.
*
* return the day of the week represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.DAY_OF_WEEK)</code>.
*
public int getDay() {
return getField(Calendar.DAY_OF_WEEK) - Calendar.SUNDAY;
}
*/
/**
* Returns the hour represented by this <tt>Date</tt> object. The
* returned value is a number (<tt>0</tt> through <tt>23</tt>)
* representing the hour within the day that contains or begins
* with the instant in time represented by this <tt>Date</tt>
* object, as interpreted in the local time zone.
*
* return the hour represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.HOUR_OF_DAY)</code>.
*
public int getHours() {
return getField(Calendar.HOUR_OF_DAY);
}
*/
/**
* Sets the hour of this <tt>Date</tt> object to the specified value.
* This <tt>Date</tt> object is modified so that it represents a point
* in time within the specified hour of the day, with the year, month,
* date, minute, and second the same as before, as interpreted in the
* local time zone.
*
* param hours the hour value.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.HOUR_OF_DAY, int hours)</code>.
*
public void setHours(int hours) {
setField(Calendar.HOUR_OF_DAY, hours);
}
*/
/**
* Returns the number of minutes past the hour represented by this date,
* as interpreted in the local time zone.
* The value returned is between <code>0</code> and <code>59</code>.
*
* return the number of minutes past the hour represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.MINUTE)</code>.
*
public int getMinutes() {
return getField(Calendar.MINUTE);
}
*/
/**
* Sets the minutes of this <tt>Date</tt> object to the specified value.
* This <tt>Date</tt> object is modified so that it represents a point
* in time within the specified minute of the hour, with the year, month,
* date, hour, and second the same as before, as interpreted in the
* local time zone.
*
* param minutes the value of the minutes.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.MINUTE, int minutes)</code>.
*
public void setMinutes(int minutes) {
setField(Calendar.MINUTE, minutes);
}
*/
/**
* Returns the number of seconds past the minute represented by this date.
* The value returned is between <code>0</code> and <code>61</code>. The
* values <code>60</code> and <code>61</code> can only occur on those
* Java Virtual Machines that take leap seconds into account.
*
* return the number of seconds past the minute represented by this date.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.get(Calendar.SECOND)</code>.
*
public int getSeconds() {
return getField(Calendar.SECOND);
}
*/
/**
* Sets the seconds of this <tt>Date</tt> to the specified value.
* This <tt>Date</tt> object is modified so that it represents a
* point in time within the specified second of the minute, with
* the year, month, date, hour, and minute the same as before, as
* interpreted in the local time zone.
*
* param seconds the seconds value.
* see java.util.Calendar
* deprecated As of JDK version 1.1,
* replaced by <code>Calendar.set(Calendar.SECOND, int seconds)</code>.
*
public void setSeconds(int seconds) {
setField(Calendar.SECOND, seconds);
}
*/
/**
* Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
* represented by this <tt>Date</tt> object.
*
* @return the number of milliseconds since January 1, 1970, 00:00:00 GMT
* represented by this date.
*/
public long getTime() {
return getTimeImpl();
}
private final long getTimeImpl() {
return (cal == null) ? fastTime : cal.getTimeInMillis();
}
/**
* Sets this <tt>Date</tt> object to represent a point in time that is
* <tt>time</tt> milliseconds after January 1, 1970 00:00:00 GMT.
*
* @param time the number of milliseconds.
*/
public void setTime(long time) {
if (cal == null) {
fastTime = time;
}
else {
cal.setTimeInMillis(time);
}
}
/**
* Tests if this date is before the specified date.
*
* @param when a date.
* @return <code>true</code> if and only if the instant of time
* represented by this <tt>Date</tt> object is strictly
* earlier than the instant represented by <tt>when</tt>;
* <code>false</code> otherwise.
*/
public boolean before(Date when) {
return getTime() < when.getTime();
}
/**
* Tests if this date is after the specified date.
*
* @param when a date.
* @return <code>true</code> if and only if the instant represented
* by this <tt>Date</tt> object is strictly later than the
* instant represented by <tt>when</tt>;
* <code>false</code> otherwise.
*/
public boolean after(Date when) {
return getTime() > when.getTime();
}
/**
* Compares two dates for equality.
* The result is <code>true</code> if and only if the argument is
* not <code>null</code> and is a <code>Date</code> object that
* represents the same point in time, to the millisecond, as this object.
* <p>
* Thus, two <code>Date</code> objects are equal if and only if the
* <code>getTime</code> method returns the same <code>long</code>
* value for both.
*
* @param obj the object to compare with.
* @return <code>true</code> if the objects are the same;
* <code>false</code> otherwise.
* @see java.util.Date#getTime()
*/
public boolean equals(Object obj) {
return obj instanceof Date && getTime() == ((Date) obj).getTime();
}
/**
* Compares two Dates for ordering.
*
* @param anotherDate the <code>Date</code> to be compared.
* @return the value <code>0</code> if the argument Date is equal to
* this Date; a value less than <code>0</code> if this Date
* is before the Date argument; and a value greater than
* <code>0</code> if this Date is after the Date argument.
* @since 1.2
*/
public int compareTo(Date anotherDate) {
long thisTime = this.getTime();
long anotherTime = anotherDate.getTime();
return (thisTime<anotherTime ? -1 : (thisTime==anotherTime ? 0 : 1));
}
/**
* Compares this Date to another Object. If the Object is a Date,
* this function behaves like <code>compareTo(Date)</code>. Otherwise,
* it throws a <code>ClassCastException</code> (as Dates are comparable
* only to other Dates).
*
* @param o the <code>Object</code> to be compared.
* @return the value <code>0</code> if the argument is a Date
* equal to this Date; a value less than <code>0</code> if the
* argument is a Date after this Date; and a value greater than
* <code>0</code> if the argument is a Date before this Date.
* @exception ClassCastException if the argument is not a
* <code>Date</code>.
* @see java.lang.Comparable
* @since 1.2
*/
public int compareTo(Object o) {
return compareTo((Date)o);
}
/**
* Returns a hash code value for this object. The result is the
* exclusive OR of the two halves of the primitive <tt>long</tt>
* value returned by the {@link Date#getTime}
* method. That is, the hash code is the value of the expression:
* <blockquote><pre>
* (int)(this.getTime()^(this.getTime() >>> 32))</pre></blockquote>
*
* @return a hash code value for this object.
*/
public int hashCode() {
long ht = getTime();
return (int) ht ^ (int) (ht >> 32);
}
/**
* Converts this <code>Date</code> object to a <code>String</code>
* of the form:
* <blockquote><pre>
* dow mon dd hh:mm:ss zzz yyyy</pre></blockquote>
* where:<ul>
* <li><tt>dow</tt> is the day of the week (<tt>Sun, Mon, Tue, Wed,
* Thu, Fri, Sat</tt>).
* <li><tt>mon</tt> is the month (<tt>Jan, Feb, Mar, Apr, May, Jun,
* Jul, Aug, Sep, Oct, Nov, Dec</tt>).
* <li><tt>dd</tt> is the day of the month (<tt>01</tt> through
* <tt>31</tt>), as two decimal digits.
* <li><tt>hh</tt> is the hour of the day (<tt>00</tt> through
* <tt>23</tt>), as two decimal digits.
* <li><tt>mm</tt> is the minute within the hour (<tt>00</tt> through
* <tt>59</tt>), as two decimal digits.
* <li><tt>ss</tt> is the second within the minute (<tt>00</tt> through
* <tt>61</tt>, as two decimal digits.
* <li><tt>zzz</tt> is the time zone (and may reflect daylight saving
* time). Standard time zone abbreviations include those
* recognized by the method <tt>parse</tt>. If time zone
* information is not available, then <tt>zzz</tt> is empty -
* that is, it consists of no characters at all.
* <li><tt>yyyy</tt> is the year, as four decimal digits.
* </ul>
*
* @return a string representation of this date.
*/
public String toString() {
DateFormat formatter = null;
if (simpleFormatter != null) {
formatter = (DateFormat)simpleFormatter.get();
}
if (formatter == null) {
/* No cache yet, or cached formatter GC'd */
formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy",
Locale.US);
simpleFormatter = new SoftReference(formatter);
}
synchronized (formatter) {
formatter.setTimeZone(TimeZone.getDefault());
return formatter.format(this);
}
}
/**
* Creates a string representation of this <tt>Date</tt> object in an
* implementation-dependent form. The intent is that the form should
* be familiar to the user of the Java application, wherever it may
* happen to be running. The intent is comparable to that of the
* "<code>%c</code>" format supported by the <code>strftime()</code>
* function of ISO C.
*
* return a string representation of this date, using the locale
* conventions.
* see java.text.DateFormat
* see java.util.Date#toGMTString()
* deprecated As of JDK version 1.1,
* replaced by <code>DateFormat.format(Date date)</code>.
*
public String toLocaleString() {
DateFormat formatter = DateFormat.getDateTimeInstance();
return formatter.format(this);
}
*/
/**
* Creates a string representation of this <tt>Date</tt> object of
* the form:
* <blockquote<pre>
* d mon yyyy hh:mm:ss GMT</pre></blockquote>
* where:<ul>
* <li><i>d</i> is the day of the month (<tt>1</tt> through <tt>31</tt>),
* as one or two decimal digits.
* <li><i>mon</i> is the month (<tt>Jan, Feb, Mar, Apr, May, Jun, Jul,
* Aug, Sep, Oct, Nov, Dec</tt>).
* <li><i>yyyy</i> is the year, as four decimal digits.
* <li><i>hh</i> is the hour of the day (<tt>00</tt> through <tt>23</tt>),
* as two decimal digits.
* <li><i>mm</i> is the minute within the hour (<tt>00</tt> through
* <tt>59</tt>), as two decimal digits.
* <li><i>ss</i> is the second within the minute (<tt>00</tt> through
* <tt>61</tt>), as two decimal digits.
* <li><i>GMT</i> is exactly the ASCII letters "<tt>GMT</tt>" to indicate
* Greenwich Mean Time.
* </ul><p>
* The result does not depend on the local time zone.
*
* return a string representation of this date, using the Internet GMT
* conventions.
* see java.text.DateFormat
* see java.util.Date#toLocaleString()
* deprecated As of JDK version 1.1,
* replaced by <code>DateFormat.format(Date date)</code>, using a
* GMT <code>TimeZone</code>.
*
public String toGMTString() {
DateFormat formatter = null;
if (gmtFormatter != null) {
formatter = (DateFormat)gmtFormatter.get();
}
if (formatter == null) {
/* No cache yet, or cached formatter GC'd *
formatter = new SimpleDateFormat("d MMM yyyy HH:mm:ss 'GMT'",
Locale.US);
formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
gmtFormatter = new SoftReference(formatter);
}
return formatter.format(this);
}
*/
/**
* Returns the offset, measured in minutes, for the local time zone
* relative to UTC that is appropriate for the time represented by
* this <tt>Date</tt> object.
* <p>
* For example, in Massachusetts, five time zones west of Greenwich:
* <blockquote><pre>
* new Date(96, 1, 14).getTimezoneOffset() returns 300</pre></blockquote>
* because on February 14, 1996, standard time (Eastern Standard Time)
* is in use, which is offset five hours from UTC; but:
* <blockquote><pre>
* new Date(96, 5, 1).getTimezoneOffset() returns 240</pre></blockquote>
* because on June 1, 1996, daylight saving time (Eastern Daylight Time)
* is in use, which is offset only four hours from UTC.<p>
* This method produces the same result as if it computed:
* <blockquote><pre>
* (this.getTime() - UTC(this.getYear(),
* this.getMonth(),
* this.getDate(),
* this.getHours(),
* this.getMinutes(),
* this.getSeconds())) / (60 * 1000)
* </pre></blockquote>
*
* return the time-zone offset, in minutes, for the current time zone.
* see java.util.Calendar#ZONE_OFFSET
* see java.util.Calendar#DST_OFFSET
* see java.util.TimeZone#getDefault
* deprecated As of JDK version 1.1,
* replaced by <code>-(Calendar.get(Calendar.ZONE_OFFSET) +
* Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000)</code>.
*
public int getTimezoneOffset() {
int offset;
if (cal == null) {
if (staticCal == null)
makeStaticCalendars();
synchronized (staticCal) {
staticCal.setTimeZone(TimeZone.getDefault());
staticCal.setTimeInMillis(getTime());
offset = staticCal.get(Calendar.ZONE_OFFSET) +
staticCal.get(Calendar.DST_OFFSET);
}
}
else {
TimeZone defaultZone = TimeZone.getDefault();
if (!defaultZone.equals(cal.getTimeZone())) {
long ms = cal.getTimeInMillis();
cal.setTimeZone(TimeZone.getDefault());
cal.setTimeInMillis(ms);
}
offset = cal.get(Calendar.ZONE_OFFSET) +
cal.get(Calendar.DST_OFFSET);
}
return -(offset / 1000 / 60); // convert to minutes
}
*/
/**
* Save the state of this object to a stream (i.e., serialize it).
*
* @serialData The value returned by <code>getTime()</code>
* is emitted (long). This represents the offset from
* January 1, 1970, 00:00:00 GMT in milliseconds.
*/
private void writeObject(ObjectOutputStream s)
throws IOException
{
s.writeLong(getTimeImpl());
}
/**
* Reconstitute this object from a stream (i.e., deserialize it).
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException
{
fastTime = s.readLong();
// we expect to have cal == null here
}
/**
* Return a field for this date by looking it up in a Calendar object.
*
* @return the field value
* @see java.util.Calendar
* @param field the field to return
*/
private final int getField(int field) {
if (cal == null) {
if (staticCal == null)
makeStaticCalendars();
synchronized (staticCal) {
staticCal.setTimeZone(TimeZone.getDefault());
staticCal.setTimeInMillis(fastTime);
return staticCal.get(field);
}
}
else {
TimeZone defaultZone = TimeZone.getDefault();
if (!defaultZone.equals(cal.getTimeZone())) {
long ms = cal.getTimeInMillis();
cal.setTimeZone(TimeZone.getDefault());
cal.setTimeInMillis(ms);
}
return cal.get(field);
}
}
/**
* Set a field for this day.
*
* @param field the field to set
* @param value the value to set it to
* @see java.util.Calendar
*/
private final void setField(int field, int value) {
if (cal == null) {
cal = new GregorianCalendar();
cal.setTimeInMillis(fastTime);
}
cal.set(field, value);
}
private synchronized static void makeStaticCalendars() {
if (staticCal == null) {
GregorianCalendar calendar = new GregorianCalendar();
utcCal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
defaultCenturyStart = calendar.get(Calendar.YEAR) - 80;
staticCal = calendar;
}
}
}