mysql中用函式 TIMESTAMPDIFF 計算兩個時間差。

語法：TIMESTAMPDIFF（interval,time_start,time_end）

案例1：計算兩個時間相隔多少天

SELECT TIMESTAMPDIFF( DAY, '2017-12-01 12:15:12','2018-01-01 7:18:20') day_time

SELECT TIMESTAMPDIFF( MONTH, '2017-11-01 12:15:12','2018-01-01 12:15:12') day_time

SELECT TIMESTAMPDIFF( YEAR, '2017-01-01 12:15:12','2018-01-01 12:15:12') day_time
 

SELECT TIMESTAMPDIFF( WEEK, '2018-01-01 12:15:12','2018-01-08 12:15:12') day_time