And when these sections are executed by different threads, you cannot use the same instance of SimpleDateFormat. Which is a pity because frequently the same date/time format is used within sections of an application. This means you cannot use the same instance from multiple threads. The SimpleDateFormat class is not thread safe. Do the following (as root): # dpkg-reconfigure tzdata 7. Want system-wide changes? On ubuntu, this necessitates changing the /etc/localtime file. Or change the time zone outside the program by specifying the system property user.timezone. Change the JVM time zone programmatically as follows: tDefault(TimeZone.getTimeZone("PST")) The default time zone comes from the JVM. SimpleDateFormat df = new SimpleDateFormat(.) ĭf.setTimeZone(TimeZone.getTimeZone("America/Los_Angeles")) Letterĭay number of week (1 = Monday, …, 7 = Sunday)Ĭhange the time zone of the date format instance by using the method setTimeZone().
#SIMPLEDATEFORMAT FULL#
Here is the full list of supported date and time format characters ( from the Javadocs). prints: 22:52:11 Time of the day with time zone. prints: 2017-050 Time of the day in local time zone. prints: 2017-W08-3 Date with year and day of the year. prints: 2017-W08 Date with week and day of the week. new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZ") prints: T22:36:06-0800 Date and time with seconds and decimal fraction of a second. new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZ") prints: T22:19-0800 Date and time including seconds. new SimpleDateFormat("yyyy-MM-dd'T'HH:mmZZZZ") prints: Date and time with hour, minute and time zone.
4-digit year only SimpleDateFormat df = new SimpleDateFormat("yyyy") Let us now look at some commonly used formats. String str = String.format("%1$tF", new Date()) prints: 2017 Complete Date String str = String.format("%1$tY-%1$tm-%1$td", new Date()) Here are some examples: 4-digit year String str = String.format("%1$tY", new Date()) It provides most of the formatting directives that SimpleDateFormat does (though requiring some extra characters).
(dateFormat.format(new Date())) Īnother option when it comes to formatting dates is to use String.format(). Pass in a Dateinstance and generate output in the chosen format. Formatting Date and Timeįormat a date using the pattern specified with format(). Use it to parse a string into a date as follows: Date date = dateFormat.parse("") SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd") Note that if you need to parse for (or include) literal characters in the format string, you need to quote it with a single quote ( \u0027). (See below for a table of all format directives.) Create a SimpleDateFormat instance by specifying the format. Let us learn the proper usage of SimpleDateFormat and delve into some of its issues.Ī first look at its usage. It is similar to using the POSIX function strftime() in C/C++ with a few gotchas. We can parse and format dates in Java easily with the SimpleDateFormatclass.
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