MySQL日期处理

<PRE class=Java minmax_bound="true">1. mysql> select now(),date(now()),sysdate();
2. +---------------------+-------------+---------------------+
3. | now() | date(now()) | sysdate() |
4. +---------------------+-------------+---------------------+
5. | 2008-12-02 10:11:36 | 2008-12-02 | 2008-12-02 10:11:36 |
6. +---------------------+-------------+---------------------+
7. 1 row in set (0.00 sec)
8. mysql> select curdate(),curdate()+0,curtime(),curtime()+0;
9. +---------------------+-------------+---------------------+
10. | curdate() | curdate()+0 | curtime() | curtime()+0 |
11. +---------------------+-------------+---------------------+
12. | 2008-12-02 | 20081202 | 10:00:33 | 100033.000000 |
13. +---------------------+-------------+---------------------+
–返回日期当月最后一天
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1. mysql> select last_day('2008-12-02');
2. +------------------------+
3. | last_day('2008-12-02') |
4. +------------------------+
5. | 2008-12-31 |
6. +------------------------+
7. 1 row in set (0.00 sec)
–返回日期的星期几
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1. mysql> select dayname('2008-12-02'),dayofweek('2008-12-02');
2. +-----------------------+-------------------------+
3. | dayname('2008-12-02') | dayofweek('2008-12-02') |
4. +-----------------------+-------------------------+
5. | tuesday | 3 |
6. +-----------------------+-------------------------+
7. 1 row in set (0.00 sec)

–返回日期的年，月，日
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1. mysql> select month('2008-12-02'),year('2008-12-02'),day('2008-12-02');
2. +---------------------+--------------------+-------------------+
3. | month('2008-12-02') | year('2008-12-02') | day('2008-12-02') |
4. +---------------------+--------------------+-------------------+
5. | 12 | 2008 | 2 |
6. +---------------------+--------------------+-------------------+
7. 1 row in set (0.00 sec)
–返回日期的小时，分，秒
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1. mysql> select hour('10:05:03'),minute('10:05:03'),second('10:05:03');
2. +------------------+--------------------+--------------------+
3. | hour('10:05:03') | minute('10:05:03') | second('10:05:03') |
4. +------------------+--------------------+--------------------+
5. | 10 | 5 | 3 |
6. +------------------+--------------------+--------------------+
7. 1 row in set (0.00 sec)
1.subdate(d,t)：起始时间加上一段时间（year,month,day…）
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1. mysql> select date_add('1998-01-02', interval 31 day),adddate('1998-01-02', 31);
2. +-----------------------------------------+---------------------------+
3. | date_add('1998-01-02', interval 31 day) | adddate('1998-01-02', 31) |
4. +-----------------------------------------+---------------------------+
5. | 1998-02-02 | 1998-02-02 |
6. +-----------------------------------------+---------------------------+
7. 1 row in set (0.00 sec)
8. mysql> select date_add('1998-01-02',interval 2 year);
9. +-----------------------------------------------------+
10. | date_add('1998-01-02', interval 2 year)
11. +-----------------------------------------------------+
12. | 2000-01-02
13. +-----------------------------------------------------+
14. 1 row in set (0.00 sec)
15. mysql> select date_add('1998-01-02', interval 2 hour);
16. +-----------------------------------------------------+
17. | date_add('1998-01-02', interval 2 hour)
18. +-----------------------------------------------------+
19. | 1998-01-02 02:00:00
20. +-----------------------------------------------------+
21. 1 row in set (0.00 sec)
2.subdate(d,t)：起始时间减去一段时间
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1. mysql> select subdate('1998-01-02', interval 31 day),subdate('1998-01-02', 31);
2. +----------------------------------------+---------------------------+
3. | subdate('1998-01-02', interval 31 day) | subdate('1998-01-02', 31) |
4. +----------------------------------------+---------------------------+
5. | 1997-12-02 | 1997-12-02 |
6. +----------------------------------------+---------------------------+
7. 1 row in set (0.00 sec)
3.addtime(d,t):起始时间d加入时间t
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1. mysql> select addtime('1997-12-31 23:59:50','00:00:05'), addtime('23:59:50','00:00:05') ;
2. +-------------------------------------------+--------------------------------+
3. | addtime('1997-12-31 23:59:50','00:00:05') | addtime('23:59:50','00:00:05') |
4. +-------------------------------------------+--------------------------------+
5. | 1997-12-31 23:59:55 | 23:59:55 |
6. +-------------------------------------------+--------------------------------+
7. 1 row in set (0.00 sec)
4.subtime(d,t):起始时间d减去时间t
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1. mysql> select subtime('1997-12-31 23:59:50','00:00:05'), subtime('23:59:50','00:00:05');
2. +-------------------------------------------+--------------------------------+
3. | subtime('1997-12-31 23:59:50','00:00:05') | subtime('23:59:50','00:00:05') |
4. +-------------------------------------------+--------------------------------+
5. | 1997-12-31 23:59:45 | 23:59:45 |
6. +-------------------------------------------+--------------------------------+
7. 1 row in set (0.00 sec)
5.datediff(d1,d2):返回起始时间d1和结束时间d2之间的天数

1. mysql> select datediff('1997-12-31 23:59:59','1997-12-30');
2. +----------------------------------------------+
3. | datediff('1997-12-31 23:59:59','1997-12-30') |
4. +----------------------------------------------+
5. | 1 |
6. +----------------------------------------------+
7. 1 row in set (0.00 sec)
6.date_format(date,format):根据format字符串显示date值的格式

1. mysql> select date_format('2008-12-02 22:23:00', '%y %m %m %h:%i:%s');
2. +---------------------------------------------------------+
3. | date_format('2008-12-02 22:23:00', '%y %m %m %h:%i:%s') |
4. +---------------------------------------------------------+
5. | 2008 12 12 22:23:00 |
6. +---------------------------------------------------------+
7. 1 row in set (0.00 sec)
7.str_to_date(str,format) 字符串转化为时间
mysql> select str_to_date(’04/31/2004′, ‘%m/%d/%y %h:%i:s’);
+———————————————–+
| str_to_date(’04/31/2004′, ‘%m/%d/%y %h:%i:s’) |
+———————————————–+
| 2004-04-31 00:00:00 |
+———————————————–+
1 row in set (0.00 sec)
8.timestamp(expr) , timestamp(expr,expr2) :
对于一个单参数,该函数将日期或日期时间表达式 expr 作为日期时间值返回.对于两个参数, 它将时间表达式 expr2添加到日期或日期时间表达式 expr 中，将theresult作为日期时间值返回

1. mysql> select timestamp('2003-12-31'), timestamp('2003-12-31 12:00:00','12:00:00');
2. +-------------------------+---------------------------------------------+
3. | timestamp('2003-12-31') | timestamp('2003-12-31 12:00:00','12:00:00') |
4. +-------------------------+---------------------------------------------+
5. | 2003-12-31 00:00:00 | 2004-01-01 00:00:00 |
6. +-------------------------+---------------------------------------------+
7. 1 row in set (0.00 sec)
9.取当天0点0分，下一天0点0分
1. mysql> select timestamp(date(sysdate())),timestamp(adddate(date(sysdate()),1));
2. +----------------------------+---------------------------------------+
3. | timestamp(date(sysdate())) | timestamp(adddate(date(sysdate()),1)) |
4. +----------------------------+---------------------------------------+
5. | 2008-12-02 00:00:00 | 2008-12-03 00:00:00 |
6. +----------------------------+---------------------------------------+
7. 1 row in set (0.00 sec) </PRE>
<PRE class=Java minmax_bound="true"><A href="http://blog.youkuaiyun.com/superjava_2006/archive/2007/05/15/1609569.aspx" minmax_bound="true">http://blog.youkuaiyun.com/superjava_2006/archive/2007/05/15/1609569.aspx</A>

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