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。
原文地址：http://www.cnblogs.com/wayne173/p/3777515.html
