为什么用Java日历解析时会出现错误的月份

Question

Date fakeDate = sdf.parse("15/07/2013 11:00 AM");
Calendar calendar = Calendar.getInstance()
calendar.setTime(fakeDate);
int currentMonth = calendar.get(Calendar.MONTH);

I get currentMonth == 6 instead of 7.

why is that?

Answer 1

Because Calendar.MONTH is ZERO based. Why ?

Check the docs : (always)

Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year in the Gregorian and Julian calendars is JANUARY which is 0 ; the last depends on the number of months in a year.

Answer 2

As the doc says - Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year in the Gregorian and Julian calendars is JANUARY which is 0; the last depends on the number of months in a year.

So try something like this

int currentMonth = calendar.get(Calendar.MONTH)+1;

Because calendar.get(Calendar.MONTH) shall give you (currentMonthValue-1) as the value of january starts with 0

Answer 3

它应该是

int currentMonth = calendar.get(Calendar.MONTH)+1;