获得某月份的天数

//获得某月份的天数
private int getDaysForMonth(int month) {
        // month is 0-based
        if (month == 1) {
            int x400 = month % 400;
            if (x400 < 0)
            {
                x400 = -x400;
            }
            boolean is29 = (month % 4) == 0 && x400 != 100 && x400 != 200 && x400 != 300;

            return is29 ? 29 : 28;
        }

        if (month == 3 || month == 5 || month == 8 || month == 10)
            return 30;
        else
            return 31;
    }

private int getDaysForMonth(int month, int year) {

    // month is 0-based

if (month == 1) {
        int x400 = month % 400;
        if (x400 < 0)
        {
            x400 = -x400;
        }
        boolean is29 = (month % 4) == 0 && x400 != 100 && x400 != 200 && x400 != 300;

        return is29 ? 29 : 28;
    }

    if (month == 3 || month == 5 || month == 8 || month == 10)
        return 30;
    else
        return 31;
}