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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