Class Date
- java.lang.Object
-
- java.util.Date
- All Implemented Interfaces:
-
Serializable
,Cloneable
,Comparable<Date>
public class Date extends Object implements Serializable, Cloneable, Comparable<Date>
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 United States Naval Observatory (USNO):
http://www.usno.navy.mil/USNO
and the material regarding "Systems of Time" at:
http://www.usno.navy.mil/USNO/time/master-clock/systems-of-time
which has descriptions of various different time systems including UT, UT1, and UTC.
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.
- Since:
- 1.0
- See Also:
-
DateFormat
,Calendar
,TimeZone
, Serialized Form
Constructor Summary
Constructor | Description |
---|---|
Date() | Allocates a |
Date(int year,
int month,
int date) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(year + 1900, month, date) or GregorianCalendar(year + 1900, month, date) . |
Date(int year,
int month,
int date,
int hrs,
int min) | 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) . |
Date(int year,
int month,
int date,
int hrs,
int min,
int sec) | 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) . |
Date(long date) | Allocates a |
Date(String s) | Deprecated. As of JDK version 1.1, replaced by DateFormat.parse(String s) . |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
boolean | after(Date when) | Tests if this date is after the specified date. |
boolean | before(Date when) | Tests if this date is before the specified date. |
Object | clone() | Return a copy of this object. |
int | compareTo(Date anotherDate) | Compares two Dates for ordering. |
boolean | equals(Object obj) | Compares two dates for equality. |
static Date | from(Instant instant) | Obtains an instance of |
int | getDate() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.DAY_OF_MONTH) . |
int | getDay() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.DAY_OF_WEEK) . |
int | getHours() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.HOUR_OF_DAY) . |
int | getMinutes() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.MINUTE) . |
int | getMonth() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.MONTH) . |
int | getSeconds() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.SECOND) . |
long | getTime() | Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this |
int | getTimezoneOffset() | Deprecated. As of JDK version 1.1, replaced by -(Calendar.get(Calendar.ZONE_OFFSET) +
Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000) . |
int | getYear() | Deprecated. As of JDK version 1.1, replaced by Calendar.get(Calendar.YEAR) - 1900 . |
int | hashCode() | Returns a hash code value for this object. |
static long | parse(String s) | Deprecated. As of JDK version 1.1, replaced by DateFormat.parse(String s) . |
void | setDate(int date) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.DAY_OF_MONTH, int date) . |
void | setHours(int hours) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.HOUR_OF_DAY, int hours) . |
void | setMinutes(int minutes) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.MINUTE, int minutes) . |
void | setMonth(int month) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.MONTH, int month) . |
void | setSeconds(int seconds) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.SECOND, int seconds) . |
void | setTime(long time) | Sets this |
void | setYear(int year) | Deprecated. As of JDK version 1.1, replaced by Calendar.set(Calendar.YEAR, year + 1900) . |
String | toGMTString() | Deprecated. As of JDK version 1.1, replaced by DateFormat.format(Date date) , using a GMT TimeZone . |
Instant | toInstant() | Converts this |
String | toLocaleString() | Deprecated. As of JDK version 1.1, replaced by DateFormat.format(Date date) . |
String | toString() | Converts this |
static long | UTC(int year,
int month,
int date,
int hrs,
int min,
int sec) | 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() . |
Methods declared in class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
Constructor Detail
Date
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 Also:
System.currentTimeMillis()
Date
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.
- Parameters:
-
date
- the milliseconds since January 1, 1970, 00:00:00 GMT. - See Also:
System.currentTimeMillis()
Date
@Deprecated public Date(int year, int month, int date)
Calendar.set(year + 1900, month, date)
or GregorianCalendar(year + 1900, month, 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.
- Parameters:
-
year
- the year minus 1900. -
month
- the month between 0-11. -
date
- the day of the month between 1-31. - See Also:
Calendar
Date
@Deprecated public Date(int year, int month, int date, int hrs, int min)
Calendar.set(year + 1900, month, date, hrs, min)
or GregorianCalendar(year + 1900, month, date, hrs, 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.
- Parameters:
-
year
- the year minus 1900. -
month
- the month between 0-11. -
date
- the day of the month between 1-31. -
hrs
- the hours between 0-23. -
min
- the minutes between 0-59. - See Also:
Calendar
Date
@Deprecated public Date(int year, int month, int date, int hrs, int min, int sec)
Calendar.set(year + 1900, month, date, hrs, min, sec)
or GregorianCalendar(year + 1900, month, date, hrs, min, 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.
- Parameters:
-
year
- the year minus 1900. -
month
- the month between 0-11. -
date
- the day of the month between 1-31. -
hrs
- the hours between 0-23. -
min
- the minutes between 0-59. -
sec
- the seconds between 0-59. - See Also:
Calendar
Date
@Deprecated public Date(String s)
DateFormat.parse(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 parse(java.lang.String)
method.
- Parameters:
-
s
- a string representation of the date. - See Also:
-
DateFormat
,parse(java.lang.String)
Method Detail
clone
public Object clone()
Return a copy of this object.
UTC
@Deprecated public static long UTC(int year, int month, int date, int hrs, int min, int sec)
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()
.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).
- Parameters:
-
year
- the year minus 1900. -
month
- the month between 0-11. -
date
- the day of the month between 1-31. -
hrs
- the hours between 0-23. -
min
- the minutes between 0-59. -
sec
- the seconds between 0-59. - Returns:
- the number of milliseconds since January 1, 1970, 00:00:00 GMT for the date and time specified by the arguments.
- See Also:
Calendar
parse
@Deprecated public static long parse(String s)
DateFormat.parse(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 specifyGMT
,UT
, orUTC
redundantly-for example,GMT-5
orutc+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
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
to11
), 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 than1
or greater than12
). - A word that matches
PM
, ignoring case, adds12
to the hour (but the parse fails if an hour has not been recognized or is less than1
or greater than12
). - Any word that matches any prefix of
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY
, orSATURDAY
, ignoring case, is ignored. For example,sat, Friday, TUE
, andThurs
are ignored. - Otherwise, any word that matches any prefix of
JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER
, orDECEMBER
, ignoring case, and considering them in the order given here, is recognized as specifying a month and is converted to a number (0
to11
). For example,aug, Sept, april
, andNOV
are recognized as months. So isMa
, which is recognized asMARCH
, notMAY
. - Any word that matches
GMT, UT
, orUTC
, ignoring case, is treated as referring to UTC. - Any word that matches
EST, CST, MST
, orPST
, 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 matchesEDT, CDT, MDT
, orPDT
, 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.
- Parameters:
-
s
- a string to be parsed as a date. - Returns:
- the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by the string argument.
- See Also:
DateFormat
getYear
@Deprecated public int getYear()
Calendar.get(Calendar.YEAR) - 1900
.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.
- Returns:
- the year represented by this date, minus 1900.
- See Also:
Calendar
setYear
@Deprecated public void setYear(int year)
Calendar.set(Calendar.YEAR, year + 1900)
.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.)
- Parameters:
-
year
- the year value. - See Also:
Calendar
getMonth
@Deprecated public int getMonth()
Calendar.get(Calendar.MONTH)
.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.
- Returns:
- the month represented by this date.
- See Also:
Calendar
setMonth
@Deprecated public void setMonth(int month)
Calendar.set(Calendar.MONTH, 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.
- Parameters:
-
month
- the month value between 0-11. - See Also:
Calendar
getDate
@Deprecated public int getDate()
Calendar.get(Calendar.DAY_OF_MONTH)
.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.
- Returns:
- the day of the month represented by this date.
- See Also:
Calendar
setDate
@Deprecated public void setDate(int date)
Calendar.set(Calendar.DAY_OF_MONTH, 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.
- Parameters:
-
date
- the day of the month value between 1-31. - See Also:
Calendar
getDay
@Deprecated public int getDay()
Calendar.get(Calendar.DAY_OF_WEEK)
.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.
- Returns:
- the day of the week represented by this date.
- See Also:
Calendar
getHours
@Deprecated public int getHours()
Calendar.get(Calendar.HOUR_OF_DAY)
.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.
- Returns:
- the hour represented by this date.
- See Also:
Calendar
setHours
@Deprecated public void setHours(int hours)
Calendar.set(Calendar.HOUR_OF_DAY, 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.
- Parameters:
-
hours
- the hour value. - See Also:
Calendar
getMinutes
@Deprecated public int getMinutes()
Calendar.get(Calendar.MINUTE)
.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
.
- Returns:
- the number of minutes past the hour represented by this date.
- See Also:
Calendar
setMinutes
@Deprecated public void setMinutes(int minutes)
Calendar.set(Calendar.MINUTE, 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.
- Parameters:
-
minutes
- the value of the minutes. - See Also:
Calendar
getSeconds
@Deprecated public int getSeconds()
Calendar.get(Calendar.SECOND)
.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.
- Returns:
- the number of seconds past the minute represented by this date.
- See Also:
Calendar
setSeconds
@Deprecated public void setSeconds(int seconds)
Calendar.set(Calendar.SECOND, 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.
- Parameters:
-
seconds
- the seconds value. - See Also:
Calendar
getTime
public long getTime()
Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date
object.
- Returns:
- the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.
setTime
public void setTime(long time)
Sets this Date
object to represent a point in time that is time
milliseconds after January 1, 1970 00:00:00 GMT.
- Parameters:
-
time
- the number of milliseconds.
before
public boolean before(Date when)
Tests if this date is before the specified date.
- Parameters:
-
when
- a date. - Returns:
-
true
if and only if the instant of time represented by thisDate
object is strictly earlier than the instant represented bywhen
;false
otherwise. - Throws:
-
NullPointerException
- ifwhen
is null.
after
public boolean after(Date when)
Tests if this date is after the specified date.
- Parameters:
-
when
- a date. - Returns:
-
true
if and only if the instant represented by thisDate
object is strictly later than the instant represented bywhen
;false
otherwise. - Throws:
-
NullPointerException
- ifwhen
is null.
equals
public boolean equals(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.
- Overrides:
-
equals
in classObject
- Parameters:
-
obj
- the object to compare with. - Returns:
-
true
if the objects are the same;false
otherwise. - See Also:
getTime()
compareTo
public int compareTo(Date anotherDate)
Compares two Dates for ordering.
- Specified by:
-
compareTo
in interfaceComparable<Date>
- Parameters:
-
anotherDate
- theDate
to be compared. - Returns:
- the value
0
if the argument Date is equal to this Date; a value less than0
if this Date is before the Date argument; and a value greater than0
if this Date is after the Date argument. - Throws:
-
NullPointerException
- ifanotherDate
is null. - Since:
- 1.2
hashCode
public int hashCode()
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 getTime()
method. That is, the hash code is the value of the expression:
(int)(this.getTime()^(this.getTime() >>> 32))
- Overrides:
-
hashCode
in classObject
- Returns:
- a hash code value for this object.
- See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
toString
public String toString()
Converts this Date
object to a String
of the form:
dow mon dd hh:mm:ss zzz yyyywhere:
-
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
through31
), as two decimal digits. -
hh
is the hour of the day (00
through23
), as two decimal digits. -
mm
is the minute within the hour (00
through59
), as two decimal digits. -
ss
is the second within the minute (00
through61
, as two decimal digits. -
zzz
is the time zone (and may reflect daylight saving time). Standard time zone abbreviations include those recognized by the methodparse
. If time zone information is not available, thenzzz
is empty - that is, it consists of no characters at all. -
yyyy
is the year, as four decimal digits.
- Overrides:
-
toString
in classObject
- Returns:
- a string representation of this date.
- See Also:
-
toLocaleString()
,toGMTString()
toLocaleString
@Deprecated public String toLocaleString()
DateFormat.format(Date date)
.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.
- Returns:
- a string representation of this date, using the locale conventions.
- See Also:
-
DateFormat
,toString()
,toGMTString()
toGMTString
@Deprecated public String toGMTString()
DateFormat.format(Date date)
, using a GMT TimeZone
.Creates a string representation of this Date
object of the form:
d mon yyyy hh:mm:ss GMTwhere:
-
d is the day of the month (
1
through31
), 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
through23
), as two decimal digits. -
mm is the minute within the hour (
00
through59
), as two decimal digits. -
ss is the second within the minute (
00
through61
), 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.
- Returns:
- a string representation of this date, using the Internet GMT conventions.
- See Also:
-
DateFormat
,toString()
,toLocaleString()
getTimezoneOffset
@Deprecated public int getTimezoneOffset()
-(Calendar.get(Calendar.ZONE_OFFSET) +
Calendar.get(Calendar.DST_OFFSET)) / (60 * 1000)
.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 300because 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 240because 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)
- Returns:
- the time-zone offset, in minutes, for the current time zone.
- See Also:
-
Calendar.ZONE_OFFSET
,Calendar.DST_OFFSET
,TimeZone.getDefault()
from
public static Date from(Instant instant)
Obtains an instance of Date
from an Instant
object.
Instant
uses a precision of nanoseconds, whereas Date
uses a precision of milliseconds. The conversion will truncate any excess precision information as though the amount in nanoseconds was subject to integer division by one million.
Instant
can store points on the time-line further in the future and further in the past than Date
. In this scenario, this method will throw an exception.
- Parameters:
-
instant
- the instant to convert - Returns:
- a
Date
representing the same point on the time-line as the provided instant - Throws:
-
NullPointerException
- ifinstant
is null. -
IllegalArgumentException
- if the instant is too large to represent as aDate
- Since:
- 1.8
toInstant
public Instant toInstant()
Converts this Date
object to an Instant
.
The conversion creates an Instant
that represents the same point on the time-line as this Date
.
- Returns:
- an instant representing the same point on the time-line as this
Date
object - Since:
- 1.8