[Linux运维 -- 数据库]mysql处理时间
基本用法：
（1）获取时间日期
- 基本时间
mysql> select now();
+---------------------+
| now() |
+---------------------+
| 2015-08-24 14:48:01 |
+---------------------+
1 row in set (0.00 sec)
mysql> select curdate();
+------------+
| curdate() |
+------------+
| 2015-08-24 |
+------------+
- 获取星期几
mysql> select dayofweek(now());
+------------------+
| dayofweek(now()) |
+------------------+
| 2 |
+------------------+
mysql> select dayofweek(curdate());
+----------------------+
| dayofweek(curdate()) |
+----------------------+
| 2 |
+----------------------+
- 获取这个月的第几天
mysql> select dayofmonth(now());
+-------------------+
| dayofmonth(now()) |
+-------------------+
| 24 |
+-------------------+
1 row in set (0.00 sec)
- 获取这一年的第几天
mysql> select dayofyear(now());
+------------------+
| dayofyear(now()) |
+------------------+
| 236 |
+------------------+
1 row in set (0.00 sec)
（2）动态获取时间
- 获取一天前
mysql> select date_sub(now(), interval 1 day);
+---------------------------------+
| date_sub(now(), interval 1 day) |
+---------------------------------+
| 2015-08-23 20:06:40 |
+---------------------------------+
mysql> select date_add(now(), interval -1 day);
+----------------------------------+
| date_add(now(), interval -1 day) |
+----------------------------------+
| 2015-08-23 20:09:20 |
+----------------------------------+
- 获取一个小时前
mysql> select date_add(now(), interval -1 hour);
mysql> select date_sub(now(), interval 1 hour);
- 获取一分钟前
mysql> select date_add(now(), interval -1 minute);
mysql> select date_sub(now(), interval 1 minute);
（3） DATE_FORMAT
>select DATE_FORMAT(now(), '%Y-%m-%d %H:%i:%s');
+-----------------------------------------+
| DATE_FORMAT(now(), '%Y-%m-%d %H:%i:%s') |
+-----------------------------------------+
| 2016-01-21 11:28:54 |
+-----------------------------------------+
链接： http://www.w3school.com.cn/sql/func_date_format.asp
参考：
（1） http://www.cnblogs.com/zeroone/archive/2010/05/05/1727659.html
（2） http://justdo2008.iteye.com/blog/1141609