mysql 获取系统时间

mysql> select   now();
+---------------------+
| now()               |
+---------------------+
| 2011-06-11 12:00:54 |
+---------------------+
1 row in set (0.00 sec)

 

 

mysql> select   sysdate();
+---------------------+
| sysdate()           |
+---------------------+
| 2011-06-11 12:00:54 |
+---------------------+
1 row in set (0.00 sec)

 

 

mysql> select   curdate();
+------------+
| curdate()  |
+------------+
| 2011-06-11 |
+------------+
1 row in set (0.00 sec)

 

 

mysql>  select   current_date;
+--------------+
| current_date |
+--------------+
| 2011-06-11   |
+--------------+
1 row in set (0.00 sec)

 

 

mysql>  select   curtime();
+-----------+
| curtime() |
+-----------+
| 12:00:54  |
+-----------+
1 row in set (0.00 sec)

 

 

 

mysql> select   current_time;
+--------------+
| current_time |
+--------------+
| 12:00:54     |
+--------------+
1 row in set (0.00 sec)

 

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 ===得到当前时间的unix时间值

将具体时间来转换成timestamp

select unix_timestamp('2008-08-08'); -- 1218124800
select unix_timestamp('2008-08-08 12:30:00'); -- 1218169800

将timestamp来转换成具体时间
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'