java 獲取兩時間相差月份

/**
 * 獲取兩個日期相差的月數
 */
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);
    // 獲取年的差值
    int yearInterval = year1 - year2;
    // 如果 d1的 月-日 小於 d2的 月-日 那么 yearInterval-- 這樣就得到了相差的年數
    if (month1 < month2 || month1 == month2 && day1 < day2) {
        yearInterval--;
    }
    // 獲取月數差值
    int monthInterval = (month1 + 12) - month2;
    if (day1 < day2) {
        monthInterval--;
    }
    monthInterval %= 12;
    int monthsDiff = Math.abs(yearInterval * 12 + monthInterval);
    return monthsDiff;
}