How to format a date in java?

Question

How can change this date format \"2011-09-07T00:00:00+02:00\" into the \"dd.MM.\" i.e \"07.09.\"

Thanks in advance!

Answer 1

tl;dr

OffsetDateTime.parse( "2011-09-07T00:00:00+02:00" ).format( DateTimeFormatter.ofPattern( "dd.MM" )

java.time

The Question and other Answers use old legacy classes that have proven to be troublesome and confusing. They have been supplanted by the java.time classes.

Your input string is in standard ISO 8601 format. These formats are used by default in java.time classes. So no need to specify a formatting pattern.

OffsetDateTime odt = OffsetDateTime.parse( "2011-09-07T00:00:00+02:00" );

You can generate a String in your desired format.

DateTimeFormatter f = DateTimeFormatter.ofPattern( "dd.MM" );
String output = odt.format( f );

MonthDay

You want month and day-of-month. There is actually a class for that, MonthDay.

MonthDay md = MonthDay.from( odt );

You can generate a String in your desired format.

DateTimeFormatter f = DateTimeFormatter.ofPattern( "dd.MM" );
String output = md.format( f );