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() |
+---------------------+---------------------+
| -08-09 23:22:24 | -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('-08-08'); -- 1218124800
select unix_timestamp('-08-08 12:30:00'); -- 1218169800
select from_unixtime(1218290027); -- '-08-09 21:53:47'
select from_unixtime(1218124800); -- '-08-08 00:00:00'
select from_unixtime(1218169800); -- '-08-08 12:30:00'
select from_unixtime(1218169800, '%Y %D %M %h:%i:%s %x'); -- '
8th August 12:30:00 '
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('-08-08'); -- -08-08 00:00:00
select timestamp('-08-08 08:00:00', '01:01:01'); -- -08-08
09:01:01
select timestamp('-08-08 08:00:00', '10 01:01:01'); --
-08-18 09:01:01
select timestampadd(day, 1, '-08-08 08:00:00'); -- -08-09
08:00:00
select date_add('-08-08 08:00:00', interval 1 day); --
-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,'-08-08 12:00:00','-08-08
00:00:00'); -- -12
select datediff('-08-08 12:00:00', '-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。
