MySQL commonly used time functions detailed of recommendations

  • 2021-01-19 22:30:38
  • OfStack


DATE_SUB(date,INTERVAL expr type)

The date argument is a valid date expression. The expr parameter is the interval you want to add.

SELECT id FROM my_table WHERE create_time >= date_sub(now(), INTERVAL 3 HOUR) AND create_time < now();

Type value


2.7 Time addition and subtraction

When we give now () +-1 time, we should understand it like this:

+1/+01: Add 1 second
+101/+0101: Add 1 minute and 1 second
+10101/+010101: Plus 1 hour, 1 minute, 1 second
+1010101/+01010101: Plus 1 hour, 1 minute, 1 second per day
+101010101/+0101010101: Plus January 1 day 1:00, 1 minute, 1 second
+1101010101/+010101010101: plus 1 January 1, 1 day, 1 hour, 1 minute, 1 second. Note here that this part of year can be 4 digits (if there is no high position, zero will be added) : 00010101010101



The DATEDIFF() function returns the number of days between two dates (days only). The date1 and date2 arguments are valid datetime/date expressions.

select datediff('2016-03-29','2016-03-29');

select datediff('2016-03-29 00:00:00','2016-03-29 23:59:59');


The TIMEDIFF() function returns the number of minutes and seconds between two dates (HH:MM:ss). The date1 and date2 arguments are datetime/time expressions.

select timediff('2016-03-30 00:00:00','2016-03-28 11:11:11');

select timediff('00:00:00','11:11:11');


The DATE_FORMAT() function is used to display date/time data in different formats.

SELECT DATE_FORMAT(insert_time,'%Y-%m-%d %H:%i:%S') AS insert_time FROM user;

SELECT DATE_FORMAT(insert_time,'%Y-%m-%d') AS day, COUNT(id) AS count FROM user GROUP BY day;

格式 描述
%a 缩写星期名
%b 缩写月名
%c 月,数值
%D 带有英文前缀的月中的天
%d 月的天,数值(00-31)
%e 月的天,数值(0-31)
%f 微秒
%H 小时 (00-23)
%h 小时 (01-12)
%I 小时 (01-12)
%i 分钟,数值(00-59)
%j 年的天 (001-366)
%k 小时 (0-23)
%l 小时 (1-12)
%M 月名
%m 月,数值(00-12)
%p AM 或 PM
%r 时间,12-小时(hh:mm:ss AM 或 PM)
%S 秒(00-59)
%s 秒(00-59)
%T 时间, 24-小时 (hh:mm:ss)
%U 周 (00-53) 星期日是1周的第1天
%u 周 (00-53) 星期1是1周的第1天
%V 周 (01-53) 星期日是1周的第1天,与 %X 使用
%v 周 (01-53) 星期1是1周的第1天,与 %x 使用
%W 星期名
%w 周的天 (0=星期日, 6=星期6)
%X 年,其中的星期日是周的第1天,4 位,与 %V 使用
%x 年,其中的星期1是周的第1天,4 位,与 %v 使用
%Y 年,4 位
%y 年,2 位

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