This class is advertised as “thread-safe” and “can be used as a static member.” If you don’t mind adding a dependency on Apache Commons (or if your application already has a dependency), then this is the way to go. One solution to this problem is to use the FastDateFormatfrom Apache Commons Lang. 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 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). new SimpleDateFormat("yyyy-'W'ww-F") ĭate With Year and Day of the Year. new SimpleDateFormat("yyyy-'W'ww") ĭate With Week and Day of the Week. new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZ") ĭate With Week. new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZZZZ") ĭate and Time With Seconds and Decimal Fraction of a Second.
new SimpleDateFormat("yyyy-MM-dd'T'HH:mmZZZZ") ĭate and Time Including Seconds. new SimpleDateFormat("yyyy-MM-dd") ĭate and Time With Hour, Minute, and Time Zone. new SimpleDateFormat("yyyy-MM") Ĭomplete Date. 4-Digit Year Only SimpleDateFormat df = new SimpleDateFormat("yyyy") Let us now look at some commonly used formats. Here are some examples: 4-Digit Year String str = String.format("%1$tY", new Date()) Ĭomplete Date String str = String.format("%1$tY-%1$tm-%1$td", 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.
Use it to parse a string into a date as follows: Date date = dateFormat.parse("") įormat a date using the pattern specified with format(). 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 the table farther down in the article for all format directives.) Parsing Dates with SimpleDateFormatĬreate a SimpleDateFormat instance by specifying the format. Let's learn the proper usage of SimpleDateFormat and delve into some of its issues. It is similar to using the POSIX function strftime() in C/C++ with a few gotchas. We can easily parse and format dates in Java with the SimpleDateFormatclass.
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