What does Calendar.UNDECIMBER do?

Question

There is a constant in the Calendar class called: UNDECIMBER. It describes the 13th month.

Is there a useful purpose for this constant? In Wiki

Answer 1

The Calendar.UNDECIMBER is an additional constant in the Calendar class that is not typically used in the widely used Gregorian Calendar but certain Lunar calendars use a 13th month. That's the purpose of this field.

Refer to the Java Docs below:

https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#UNDECIMBER

Wikipedia article for this:

https://en.wikipedia.org/wiki/Undecimber

There is also a mention of a 14th month - Duodecimber in the wiki. Unfortunately, Java does not (yet) support that.

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Hope this helps!