MySQL 获取当前时间戳(Timestamp)函数

 1. MySQL 获得当前时间戳函数:current_timestamp, current_timestamp()
mysql> select current_timestamp, current_timestamp();

+———————+———————+
| current_timestamp | current_timestamp() |
+———————+———————+
| 2008-08-09 23:22:24 | 2008-08-09 23:22:24 |
+———————+———————+

2. MySQL (Unix 时间戳、日期)转换函数:
unix_timestamp(),
unix_timestamp(date),
from_unixtime(unix_timestamp),
from_unixtime(unix_timestamp,format)

下面是示例:
select unix_timestamp(); — 1218290027
select unix_timestamp(‘2008-08-08’); — 1218124800
select unix_timestamp(‘2008-08-08 12:30:00’); — 1218169800

select from_unixtime(1218290027); — ‘2008-08-09 21:53:47’
select from_unixtime(1218124800); — ‘2008-08-08 00:00:00’
select from_unixtime(1218169800); — ‘2008-08-08 12:30:00’

select from_unixtime(1218169800, ‘%Y %D %M %h:%i:%s %x’); — ‘2008 8th August 12:30:00 2008’

3. MySQL 时间戳(timestamp)转换、增、减函数:
timestamp(date) — date to timestamp
timestamp(dt,time) — dt + time
timestampadd(unit,interval,datetime_expr) —
timestampdiff(unit,datetime_expr1,datetime_expr2) —

请看示例部分:
select timestamp(‘2008-08-08’); — 2008-08-08 00:00:00
select timestamp(‘2008-08-08 08:00:00′, ’01:01:01’); — 2008-08-08 09:01:01
select timestamp(‘2008-08-08 08:00:00′, ’10 01:01:01’); — 2008-08-18 09:01:01

select timestampadd(day, 1, ‘2008-08-08 08:00:00’); — 2008-08-09 08:00:00
select date_add(‘2008-08-08 08:00:00’, interval 1 day); — 2008-08-09 08:00:00

MySQL timestampadd() 函数类似于 date_add()。
select timestampdiff(year,’2002-05-01′,’2001-01-01′); — -1
select timestampdiff(day ,’2002-05-01′,’2001-01-01′); — -485
select timestampdiff(hour,’2008-08-08 12:00:00′,’2008-08-08 00:00:00′); — -12

select datediff(‘2008-08-08 12:00:00’, ‘2008-08-01 00:00:00’); — 7

MySQL timestampdiff() 函数就比 datediff() 功能强多了,datediff() 只能计算两个日期(date)之间相差的天数。

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