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Date.javaAPI DocJava SE 5 API53353Fri Aug 26 14:57:22 BST 2005java.util

Date

public class Date extends Object implements Comparable, Cloneable, Serializable
The class Date represents a specific instant in time, with millisecond precision.

Prior to JDK 1.1, the class Date 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 Calendar class should be used to convert between dates and time fields and the DateFormat class should be used to format and parse date strings. The corresponding methods in Date are deprecated.

Although the Date 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.

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 not adjusted for leap seconds. An interesting source of further information is the U.S. Naval Observatory, particularly the Directorate of Time at:

http://tycho.usno.navy.mil

and their definitions of "Systems of Time" at:

http://tycho.usno.navy.mil/systime.html

In all methods of class Date that accept or return year, month, date, hours, minutes, and seconds values, the following representations are used:

  • A year y is represented by the integer y - 1900.
  • A month is represented by an integer from 0 to 11; 0 is January, 1 is February, and so forth; thus 11 is December.
  • A date (day of month) is represented by an integer from 1 to 31 in the usual manner.
  • 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.
  • A minute is represented by an integer from 0 to 59 in the usual manner.
  • 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.

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
1.80, 05/18/04
see
java.text.DateFormat
see
java.util.Calendar
see
java.util.TimeZone
since
JDK1.0

Fields Summary
private static final BaseCalendar
gcal
private static BaseCalendar
jcal
private transient long
fastTime
private transient BaseCalendar$Date
cdate
private static int
defaultCenturyStart
private static final long
serialVersionUID
private static final String[]
wtb
private static final int[]
ttb
Constructors Summary
public Date()
Allocates a Date 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()


                                         
      
        this(System.currentTimeMillis());
    
public Date(long date)
Allocates a Date 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()

        fastTime = date;
    
public Date(int year, int month, int date)
Allocates a Date object and initializes it so that it represents midnight, local time, at the beginning of the day specified by the year, month, and date 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 Calendar.set(year + 1900, month, date) or GregorianCalendar(year + 1900, month, date).

        this(year, month, date, 0, 0, 0);
    
public Date(int year, int month, int date, int hrs, int min)
Allocates a Date object and initializes it so that it represents the instant at the start of the minute specified by the year, month, date, hrs, and min 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 Calendar.set(year + 1900, month, date, hrs, min) or GregorianCalendar(year + 1900, month, date, hrs, min).

        this(year, month, date, hrs, min, 0);
    
public Date(int year, int month, int date, int hrs, int min, int sec)
Allocates a Date object and initializes it so that it represents the instant at the start of the second specified by the year, month, date, hrs, min, and sec 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 Calendar.set(year + 1900, month, date, hrs, min, sec) or GregorianCalendar(year + 1900, month, date, hrs, min, sec).

	int y = year + 1900;
	// month is 0-based. So we have to normalize month to support Long.MAX_VALUE.
	if (month >= 12) {
	    y += month / 12;
	    month %= 12;
	} else if (month < 0) {
	    y += CalendarUtils.floorDivide(month, 12);
	    month = CalendarUtils.mod(month, 12);
	}
	BaseCalendar cal = getCalendarSystem(y);
        cdate = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.getDefaultRef());
	cdate.setNormalizedDate(y, month + 1, date).setTimeOfDay(hrs, min, sec, 0);
	getTimeImpl();
	cdate = null;
    
public Date(String s)
Allocates a Date object and initializes it so that it represents the date and time indicated by the string s, 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 DateFormat.parse(String s).

        this(parse(s));
    
Methods Summary
public static longUTC(int year, int month, int date, int hrs, int min, int sec)
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 Date 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 Calendar.set(year + 1900, month, date, hrs, min, sec) or GregorianCalendar(year + 1900, month, date, hrs, min, sec), using a UTC TimeZone, followed by Calendar.getTime().getTime().

	int y = year + 1900;
	// month is 0-based. So we have to normalize month to support Long.MAX_VALUE.
	if (month >= 12) {
	    y += month / 12;
	    month %= 12;
	} else if (month < 0) {
	    y += CalendarUtils.floorDivide(month, 12);
	    month = CalendarUtils.mod(month, 12);
	}
	int m = month + 1;
	BaseCalendar cal = getCalendarSystem(y);
        BaseCalendar.Date udate = (BaseCalendar.Date) cal.newCalendarDate(null);
	udate.setNormalizedDate(y, m, date).setTimeOfDay(hrs, min, sec, 0);
	udate = normalize(udate);
	cal = getCalendarSystem(udate);
	return cal.getTime(udate);
    
public booleanafter(java.util.Date when)
Tests if this date is after the specified date.

param
when a date.
return
true if and only if the instant represented by this Date object is strictly later than the instant represented by when; false otherwise.
exception
NullPointerException if when is null.

        return getMillisOf(this) > getMillisOf(when);
    
public booleanbefore(java.util.Date when)
Tests if this date is before the specified date.

param
when a date.
return
true if and only if the instant of time represented by this Date object is strictly earlier than the instant represented by when; false otherwise.
exception
NullPointerException if when is null.

        return getMillisOf(this) < getMillisOf(when);
    
public java.lang.Objectclone()
Return a copy of this object.

        Date d = null;
        try {
            d = (Date)super.clone();
	    if (cdate != null) {
		d.cdate = (BaseCalendar.Date) cdate.clone();
	    }
        } catch (CloneNotSupportedException e) {} // Won't happen
        return d;
    
public intcompareTo(java.util.Date anotherDate)
Compares two Dates for ordering.

param
anotherDate the Date to be compared.
return
the value 0 if the argument Date is equal to this Date; a value less than 0 if this Date is before the Date argument; and a value greater than 0 if this Date is after the Date argument.
since
1.2
exception
NullPointerException if anotherDate is null.

	long thisTime = getMillisOf(this);
	long anotherTime = getMillisOf(anotherDate);
	return (thisTime<anotherTime ? -1 : (thisTime==anotherTime ? 0 : 1));
    
private static final java.lang.StringBuilderconvertToAbbr(java.lang.StringBuilder sb, java.lang.String name)
Converts the given name to its 3-letter abbreviation (e.g., "monday" -> "Mon") and stored the abbreviation in the given StringBuilder.

	sb.append(Character.toUpperCase(name.charAt(0)));
	sb.append(name.charAt(1)).append(name.charAt(2));
	return sb;
    
public booleanequals(java.lang.Object obj)
Compares two dates for equality. The result is true if and only if the argument is not null and is a Date object that represents the same point in time, to the millisecond, as this object.

Thus, two Date objects are equal if and only if the getTime method returns the same long value for both.

param
obj the object to compare with.
return
true if the objects are the same; false otherwise.
see
java.util.Date#getTime()

        return obj instanceof Date && getTime() == ((Date) obj).getTime();
    
private final sun.util.calendar.BaseCalendar$DategetCalendarDate()

	if (cdate == null) {
	    BaseCalendar cal = getCalendarSystem(fastTime);
	    cdate = (BaseCalendar.Date) cal.getCalendarDate(fastTime,
							    TimeZone.getDefaultRef());
	}
	return cdate;
    
private static final sun.util.calendar.BaseCalendargetCalendarSystem(int year)
Returns the Gregorian or Julian calendar system to use with the given date. Use Gregorian from October 15, 1582.

param
year normalized calendar year (not -1900)
return
the CalendarSystem to use for the specified date

	if (year >= 1582) {
	    return gcal;
	}
	return getJulianCalendar();
    
private static final sun.util.calendar.BaseCalendargetCalendarSystem(long t)

	if (t >= GregorianCalendar.DEFAULT_GREGORIAN_CUTOVER) {
	    return gcal;
	}
	return getJulianCalendar();
    
private static final sun.util.calendar.BaseCalendargetCalendarSystem(sun.util.calendar.BaseCalendar$Date cdate)

	if (jcal == null) {
	    return gcal;
	}
	if (cdate.getEra() != null) {
	    return jcal;
	}
	return gcal;
    
public intgetDate()
Returns the day of the month represented by this Date object. The value returned is between 1 and 31 representing the day of the month that contains or begins with the instant in time represented by this Date 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 Calendar.get(Calendar.DAY_OF_MONTH).
deprecated

	return normalize().getDayOfMonth();
    
public intgetDay()
Returns the day of the week represented by this date. The returned value (0 = Sunday, 1 = Monday, 2 = Tuesday, 3 = Wednesday, 4 = Thursday, 5 = Friday, 6 = Saturday) represents the day of the week that contains or begins with the instant in time represented by this Date 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 Calendar.get(Calendar.DAY_OF_WEEK).

	return normalize().getDayOfWeek() - gcal.SUNDAY;
    
public intgetHours()
Returns the hour represented by this Date object. The returned value is a number (0 through 23) representing the hour within the day that contains or begins with the instant in time represented by this Date 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 Calendar.get(Calendar.HOUR_OF_DAY).

	return normalize().getHours();
    
private static final synchronized sun.util.calendar.BaseCalendargetJulianCalendar()

	if (jcal == null) {
	    jcal = (BaseCalendar) CalendarSystem.forName("julian");
	}
	return jcal;
    
static final longgetMillisOf(java.util.Date date)
Returns the millisecond value of this Date object without affecting its internal state.

	if (date.cdate == null) {
	    return date.fastTime;
	}
	BaseCalendar.Date d = (BaseCalendar.Date) date.cdate.clone();
	return gcal.getTime(d);
    
public intgetMinutes()
Returns the number of minutes past the hour represented by this date, as interpreted in the local time zone. The value returned is between 0 and 59.

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 Calendar.get(Calendar.MINUTE).

	return normalize().getMinutes();
    
public intgetMonth()
Returns a number representing the month that contains or begins with the instant in time represented by this Date object. The value returned is between 0 and 11, with the value 0 representing January.

return
the month represented by this date.
see
java.util.Calendar
deprecated
As of JDK version 1.1, replaced by Calendar.get(Calendar.MONTH).

	return normalize().getMonth() - 1; // adjust 1-based to 0-based
    
public intgetSeconds()
Returns the number of seconds past the minute represented by this date. The value returned is between 0 and 61. The values 60 and 61 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 Calendar.get(Calendar.SECOND).

	return normalize().getSeconds();
    
public longgetTime()
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.

return
the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.

        return getTimeImpl();
    
private final longgetTimeImpl()

	if (cdate != null) {
	    normalize();
	    BaseCalendar cal = getCalendarSystem(cdate);
	    fastTime = cal.getTime(cdate);
	}
	return fastTime;
    
public intgetTimezoneOffset()
Returns the offset, measured in minutes, for the local time zone relative to UTC that is appropriate for the time represented by this Date object.

For example, in Massachusetts, five time zones west of Greenwich:

new Date(96, 1, 14).getTimezoneOffset() returns 300
because on February 14, 1996, standard time (Eastern Standard Time) is in use, which is offset five hours from UTC; but:
new Date(96, 5, 1).getTimezoneOffset() returns 240
because on June 1, 1996, daylight saving time (Eastern Daylight Time) is in use, which is offset only four hours from UTC.

This method produces the same result as if it computed:

(this.getTime() - UTC(this.getYear(),
this.getMonth(),
this.getDate(),
this.getHours(),
this.getMinutes(),
this.getSeconds())) / (60 * 1000)

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 -(Calendar.get(Calendar.ZONE_OFFSET) + Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000).

	int zoneOffset;
        if (cdate == null) {
	    TimeZone tz = TimeZone.getDefaultRef();
	    if (tz instanceof ZoneInfo) {
		zoneOffset = ((ZoneInfo)tz).getOffsets(fastTime, null);
	    } else {
		zoneOffset = tz.getOffset(fastTime);
	    }
	} else {
	    normalize();
	    zoneOffset = cdate.getZoneOffset();
	}
	return -zoneOffset/60000;  // convert to minutes
    
public intgetYear()
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 Date 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 Calendar.get(Calendar.YEAR) - 1900.


                                                                         
    
       
        return normalize().getYear() - 1900;
    
public inthashCode()
Returns a hash code value for this object. The result is the exclusive OR of the two halves of the primitive long value returned by the {@link Date#getTime} method. That is, the hash code is the value of the expression:
(int)(this.getTime()^(this.getTime() >>> 32))

return
a hash code value for this object.

        long ht = this.getTime();
        return (int) ht ^ (int) (ht >> 32);
    
private final sun.util.calendar.BaseCalendar$Datenormalize()

	if (cdate == null) {
	    BaseCalendar cal = getCalendarSystem(fastTime);
	    cdate = (BaseCalendar.Date) cal.getCalendarDate(fastTime,
							    TimeZone.getDefaultRef());
	} else {
	    TimeZone tz = TimeZone.getDefaultRef();
	    if (tz != cdate.getZone()) {
		BaseCalendar cal = getCalendarSystem(cdate);
		long t = cal.getTime(cdate);
		cdate.setZone(tz);
		cal.getCalendarDate(t, cdate);
	    }
	    cdate = normalize(cdate);
	}
	return cdate;
    
private static final sun.util.calendar.BaseCalendar$Datenormalize(sun.util.calendar.BaseCalendar$Date cdate)

	int y = cdate.getNormalizedYear();
	int m = cdate.getMonth();
	int d = cdate.getDayOfMonth();
	int hh = cdate.getHours();
	int mm = cdate.getMinutes();
	int ss = cdate.getSeconds();
	int ms = cdate.getMillis();
	TimeZone tz = cdate.getZone();

	// If the specified year can't be handled using a long value
	// in milliseconds, GregorianCalendar is used for full
	// compatibility with underflow and overflow. This is required
	// by some JCK tests. The limits are based max year values -
	// years that can be represented by max values of d, hh, mm,
	// ss and ms. Also, let GregorianCalendar handle the default
	// cutover year so that we don't need to worry about the
	// transition here.
	if (y == 1582 || y > 280000000 || y < -280000000) {
	    if (tz == null) {
		tz = TimeZone.getTimeZone("GMT");
	    }
	    GregorianCalendar gc = new GregorianCalendar(tz);
	    gc.clear();
	    gc.set(gc.MILLISECOND, ms);
	    gc.set(y, m-1, d, hh, mm, ss);
	    long t = gc.getTimeInMillis();
	    BaseCalendar cal = getCalendarSystem(t);
	    cdate = (BaseCalendar.Date) cal.getCalendarDate(t, tz);
	    return cdate;
	}

	BaseCalendar cal = getCalendarSystem(y);
	if (cal != getCalendarSystem(cdate)) {
	    cdate = (BaseCalendar.Date) cal.newCalendarDate(tz);
	    cdate.setNormalizedDate(y, m, d).setTimeOfDay(hh, mm, ss, ms);
	}
	// Perform the GregorianCalendar-style normalization.
	long t = cal.getTime(cdate);

	// In case the normalized date requires the other calendar
	// system, we need to recalculate it using the other one.
	BaseCalendar ncal = getCalendarSystem(t);
	if (ncal != cal) {
	    cdate = (BaseCalendar.Date) ncal.newCalendarDate(cdate.getZone());
	    cdate.setNormalizedDate(y, m, d).setTimeOfDay(hh, mm, ss, ms);
	    ncal.getTime(cdate);
	}
	return cdate;
    
public static longparse(java.lang.String s)
Attempts to interpret the string s 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 IllegalArgumentException is thrown.

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.

The string s is processed from left to right, looking for data of interest. Any material in s that is within the ASCII parenthesis characters ( and ) is ignored. Parentheses may be nested. Otherwise, the only characters permitted within s are these ASCII characters:

abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789,+-:/
and whitespace characters.

A consecutive sequence of decimal digits is treated as a decimal number:

  • If a number is preceded by + or - 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 - means a westward offset. Time zone offsets are always relative to UTC (Greenwich). Thus, for example, -5 occurring in the string would mean "five hours west of Greenwich" and +0430 would mean "four hours and thirty minutes east of Greenwich." It is permitted for the string to specify GMT, UT, or UTC redundantly-for example, GMT-5 or utc+0430.
  • The number is regarded as a year number if one of the following conditions is true:
    • The number is equal to or greater than 70 and followed by a space, comma, slash, or end of string
    • The number is less than 70, and both a month and a day of the month have already been recognized
    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}.
  • 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.
  • 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 0 to 11), unless a month has already been recognized, in which case it is regarded as a day of the month.
  • 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.

A consecutive sequence of letters is regarded as a word and treated as follows:

  • A word that matches AM, ignoring case, is ignored (but the parse fails if an hour has not been recognized or is less than 1 or greater than 12).
  • A word that matches PM, ignoring case, adds 12 to the hour (but the parse fails if an hour has not been recognized or is less than 1 or greater than 12).
  • Any word that matches any prefix of SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, or SATURDAY, ignoring case, is ignored. For example, sat, Friday, TUE, and Thurs are ignored.
  • Otherwise, any word that matches any prefix of JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER, or DECEMBER, ignoring case, and considering them in the order given here, is recognized as specifying a month and is converted to a number (0 to 11). For example, aug, Sept, april, and NOV are recognized as months. So is Ma, which is recognized as MARCH, not MAY.
  • Any word that matches GMT, UT, or UTC, ignoring case, is treated as referring to UTC.
  • Any word that matches EST, CST, MST, or PST, 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 EDT, CDT, MDT, or PDT, ignoring case, is recognized as referring to the same time zone, respectively, during daylight saving time.

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 DateFormat.parse(String s).

        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) {
		synchronized (Date.class) {
		    if (defaultCenturyStart == 0) {
			defaultCenturyStart = gcal.getCalendarDate().getYear() - 80;
		    }
		}
                year += (defaultCenturyStart / 100) * 100;
                if (year < defaultCenturyStart) year += 100;
            }
            if (sec < 0)
                sec = 0;
            if (min < 0)
                min = 0;
            if (hour < 0)
                hour = 0;
	    BaseCalendar cal = getCalendarSystem(year);
            if (tzoffset == -1)  { // no time zone specified, have to use local
		BaseCalendar.Date ldate = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.getDefaultRef());
		ldate.setDate(year, mon + 1, mday);
		ldate.setTimeOfDay(hour, min, sec, 0);
                return cal.getTime(ldate);
	    }
	    BaseCalendar.Date udate = (BaseCalendar.Date) cal.newCalendarDate(null); // no time zone
	    udate.setDate(year, mon + 1, mday);
	    udate.setTimeOfDay(hour, min, sec, 0);
            return cal.getTime(udate) + tzoffset * (60 * 1000);
        }
        // syntax error
        throw new IllegalArgumentException();
    
private voidreadObject(java.io.ObjectInputStream s)
Reconstitute this object from a stream (i.e., deserialize it).

        fastTime = s.readLong();
    
public voidsetDate(int date)
Sets the day of the month of this Date object to the specified value. This Date 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 Calendar.set(Calendar.DAY_OF_MONTH, int date).

        getCalendarDate().setDayOfMonth(date);
    
public voidsetHours(int hours)
Sets the hour of this Date object to the specified value. This Date 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 Calendar.set(Calendar.HOUR_OF_DAY, int hours).

        getCalendarDate().setHours(hours);
    
public voidsetMinutes(int minutes)
Sets the minutes of this Date object to the specified value. This Date 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 Calendar.set(Calendar.MINUTE, int minutes).

        getCalendarDate().setMinutes(minutes);
    
public voidsetMonth(int month)
Sets the month of this date to the specified value. This Date 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 Calendar.set(Calendar.MONTH, int month).

	int y = 0;
	if (month >= 12) {
	    y = month / 12;
	    month %= 12;
	} else if (month < 0) {
	    y = CalendarUtils.floorDivide(month, 12);
	    month = CalendarUtils.mod(month, 12);
	}
        BaseCalendar.Date d = getCalendarDate();
	if (y != 0) {
	    d.setNormalizedYear(d.getNormalizedYear() + y);
	}
	d.setMonth(month + 1); // adjust 0-based to 1-based month numbering
    
public voidsetSeconds(int seconds)
Sets the seconds of this Date to the specified value. This Date 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 Calendar.set(Calendar.SECOND, int seconds).

        getCalendarDate().setSeconds(seconds);
    
public voidsetTime(long time)
Sets this Date object to represent a point in time that is time milliseconds after January 1, 1970 00:00:00 GMT.

param
time the number of milliseconds.

	fastTime = time;
	cdate = null;
    
public voidsetYear(int year)
Sets the year of this Date object to be the specified value plus 1900. This Date 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 Calendar.set(Calendar.YEAR, year + 1900).

	getCalendarDate().setNormalizedYear(year + 1900);
    
public java.lang.StringtoGMTString()
Creates a string representation of this Date object of the form: d mon yyyy hh:mm:ss GMT
where:
  • d is the day of the month (1 through 31), as one or two decimal digits.
  • mon is the month (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec).
  • yyyy is the year, as four decimal digits.
  • hh is the hour of the day (00 through 23), as two decimal digits.
  • mm is the minute within the hour (00 through 59), as two decimal digits.
  • ss is the second within the minute (00 through 61), as two decimal digits.
  • GMT is exactly the ASCII letters "GMT" to indicate Greenwich Mean Time.

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#toString()
see
java.util.Date#toLocaleString()
deprecated
As of JDK version 1.1, replaced by DateFormat.format(Date date), using a GMT TimeZone.

	// d MMM yyyy HH:mm:ss 'GMT'
	long t = getTime();
	BaseCalendar cal = getCalendarSystem(t);
	BaseCalendar.Date date =
	    (BaseCalendar.Date) cal.getCalendarDate(getTime(), (TimeZone)null);
	StringBuilder sb = new StringBuilder(32);
	CalendarUtils.sprintf0d(sb, date.getDayOfMonth(), 1).append(' "); // d
	convertToAbbr(sb, wtb[date.getMonth() - 1 + 2 + 7]).append(' ");  // MMM
	sb.append(date.getYear()).append(' ");                            // yyyy
	CalendarUtils.sprintf0d(sb, date.getHours(), 2).append(':");      // HH
	CalendarUtils.sprintf0d(sb, date.getMinutes(), 2).append(':");    // mm
	CalendarUtils.sprintf0d(sb, date.getSeconds(), 2);                // ss
	sb.append(" GMT");                                                // ' GMT'
	return sb.toString();
    
public java.lang.StringtoLocaleString()
Creates a string representation of this Date 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 "%c" format supported by the strftime() function of ISO C.

return
a string representation of this date, using the locale conventions.
see
java.text.DateFormat
see
java.util.Date#toString()
see
java.util.Date#toGMTString()
deprecated
As of JDK version 1.1, replaced by DateFormat.format(Date date).

	DateFormat formatter = DateFormat.getDateTimeInstance();
	return formatter.format(this);
    
public java.lang.StringtoString()
Converts this Date object to a String of the form:
dow mon dd hh:mm:ss zzz yyyy
where:
  • dow is the day of the week (Sun, Mon, Tue, Wed, Thu, Fri, Sat).
  • mon is the month (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec).
  • dd is the day of the month (01 through 31), as two decimal digits.
  • hh is the hour of the day (00 through 23), as two decimal digits.
  • mm is the minute within the hour (00 through 59), as two decimal digits.
  • ss is the second within the minute (00 through 61, as two decimal digits.
  • zzz is the time zone (and may reflect daylight saving time). Standard time zone abbreviations include those recognized by the method parse. If time zone information is not available, then zzz is empty - that is, it consists of no characters at all.
  • yyyy is the year, as four decimal digits.

return
a string representation of this date.
see
java.util.Date#toLocaleString()
see
java.util.Date#toGMTString()

	// "EEE MMM dd HH:mm:ss zzz yyyy";
	BaseCalendar.Date date = normalize();
	StringBuilder sb = new StringBuilder(28);
	int index = date.getDayOfWeek();
	if (index == gcal.SUNDAY) {
	    index = 8;
	}
	convertToAbbr(sb, wtb[index]).append(' ");			  // EEE
	convertToAbbr(sb, wtb[date.getMonth() - 1 + 2 + 7]).append(' ");  // MMM
	CalendarUtils.sprintf0d(sb, date.getDayOfMonth(), 2).append(' "); // dd

	CalendarUtils.sprintf0d(sb, date.getHours(), 2).append(':");   // HH
	CalendarUtils.sprintf0d(sb, date.getMinutes(), 2).append(':"); // mm
	CalendarUtils.sprintf0d(sb, date.getSeconds(), 2).append(' "); // ss
	TimeZone zi = date.getZone();
	if (zi != null) {
	    sb.append(zi.getDisplayName(date.isDaylightTime(), zi.SHORT, Locale.US)); // zzz
	} else {
	    sb.append("GMT");
	}
	sb.append(' ").append(date.getYear());  // yyyy
	return sb.toString();
    
private voidwriteObject(java.io.ObjectOutputStream s)
Save the state of this object to a stream (i.e., serialize it).

serialData
The value returned by getTime() is emitted (long). This represents the offset from January 1, 1970, 00:00:00 GMT in milliseconds.

        s.writeLong(getTimeImpl());