Java计算两个日期相差的月数

/**
 * 获取两个日期相差的月数
 */
public static int getMonthDiff(Date d1, Date d2) {
    Calendar c1 = Calendar.getInstance();
    Calendar c2 = Calendar.getInstance();
    c1.setTime(d1);
    c2.setTime(d2);
    int year1 = c1.get(Calendar.YEAR);
    int year2 = c2.get(Calendar.YEAR);
    int month1 = c1.get(Calendar.MONTH);
    int month2 = c2.get(Calendar.MONTH);
    int day1 = c1.get(Calendar.DAY_OF_MONTH);
    int day2 = c2.get(Calendar.DAY_OF_MONTH);
    // 获取年的差值 
    int yearInterval = year1 - year2;
    // 如果 d1的 月-日 小于 d2的 月-日 那么 yearInterval-- 这样就得到了相差的年数
    if (month1 < month2 || month1 == month2 && day1 < day2) {
        yearInterval--;
    }
    // 获取月数差值
    int monthInterval = (month1 + 12) - month2;
    if (day1 < day2) {
        monthInterval--;
    }
    monthInterval %= 12;
    int monthsDiff = Math.abs(yearInterval * 12 + monthInterval);
    return monthsDiff;
}