Why calendar.get(Calendar.MONTH) returns 10 instead of 12?

Question

Why

calendarCurrent = Calendar.getInstance(Locale.US);
calendarCurrent.get(Calendar.MONTH)

returns 10 if it is 12 now?

Answer 1

月索引从0开始而不是从1开始，因此如果它已经返回10，则必须是11，在美国语言环境中可能还不是11

Answer 2

Months are zero based (an unfortunate design decision, IMHO) so 0 means January and 10 means November. It's December 1 here, but it might still be November 30 in some time zones.

Answer 3

I've just tested it and it returns 11, which is december as months are in [0, 11] .

From the javadoc :

month - the value used to set the MONTH calendar field. Month value is 0-based. eg, 0 for January.

Everything is fine. You probably tested it a little before midnight or in a non US timezone, no ?