MONTH
返回给定日期值的月份。月份返回为 1 到 12 之间的数字。
MONTH(数字)
Number is the internal date number.
=MONTH(NOW()) returns the current month.
=MONTH(C4) returns 7 if you enter 2000-07-07 to cell C4 (that date value might get formatted differently after you press Enter).