Java Reference
In-Depth Information
•
A
java.text.SimpleDateFormat
class
that
formats
and
parses
Gregorian dates and times
For example, the following code creates a
GregorianCalendar
object rep-
resenting midnight (00:00:00), October 26, 1972, in the local time
zone, then prints its value:
Calendar cal =
new GregorianCalendar(1972, Calendar.OCTOBER, 26);
System.out.println(cal.getTime());
The method
getTime
returns a
Date
object for the calendar object's time,
which was set by converting a year, month, and date into a millisecond-
measured
long
. The output would be something like this (depending on
your local time zone of course):
Thu Oct 26 00:00:00 GMT+10:00 1972
You can also work directly with the millisecond time value by using
getTimeInMillis
and
setTimeInMillis
. These are equivalent to working
with a
Date
object; for example,
getTimeInMillis
is equivalent to invoking
getTime().getTime()
.
The abstract
Calendar
class provides a large set of constants that are
useful in many calendars, such as
Calendar.AM
and
Calendar.PM
for calen-
dars that use 12-hour clocks. Some constants are useful only for cer-
tain calendars, but no calendar class is required to use such constants.
In particular, the month names in
Calendar
(such as
Calendar.JUNE
) are
names for the various month numbers (such as 5month numbers start
at
0
), with a special month
UNDECIMBER
for the thirteenth month that many
calendars have. But no calendar is required to use these constants.
Each
Calendar
object represents a particular moment in time on that cal-
endar. The
Calendar
class provides only constructors that create an ob-
