[java] How can I format date by locale in Java?

Joda-Time

Using the Joda-Time 2.4 library. The DateTimeFormat class is a factory of DateTimeFormatter formatters. That class offers a forStyle method to access formatters appropriate to a Locale.

DateTimeFormatter formatter = DateTimeFormat.forStyle( "MM" ).withLocale( Java.util.Locale.CANADA_FRENCH );
String output = formatter.print( DateTime.now( DateTimeZone.forID( "America/Montreal" ) ) );

The argument with two letters specifies a format for the date portion and the time portion. Specify a character of 'S' for short style, 'M' for medium, 'L' for long, and 'F' for full. A date or time may be ommitted by specifying a style character '-' HYPHEN.

Note that we specified both a Locale and a time zone. Some people confuse the two.

  • A time zone is an offset from UTC and a set of rules for Daylight Saving Time and other anomalies along with their historical changes.
  • A Locale is a human language such as Français, plus a country code such as Canada that represents cultural practices including formatting of date-time strings.

We need all those pieces to properly generate a string representation of a date-time value.

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