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mysql 日期(前一天(月,年),后一)

 
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1, now() 返回当前日期和时间

mysql> select now();

+---------------------+

| now()               |

+---------------------+

| 2015-03-18 22:45:17 |

+---------------------+

1 row in set (0.00 sec)

 

2.curdate() 返回当前日期

mysql> select curdate();

+------------+

| curdate()  |

+------------+

| 2015-03-18 |

+------------+

1 row in set (0.00 sec)

 

3.curtime() 返回当时时间

mysql> select curtime()

    -> ;

+-----------+

| curtime() |

+-----------+

| 22:48:00  |

+-----------+

1 row in set (0.00 sec)

 

4.date_add() 当前日期加N天(月,年)

mysql> select date_add(curdate(), interval 2 day);

+-------------------------------------+

| date_add(curdate(), interval 2 day) |

+-------------------------------------+

| 2015-03-20                          |

+-------------------------------------+

1 row in set (0.00 sec)

 

5, date_sub 与date_add相反,当前日期减N天(月,年)

mysql> select date_sub(curdate(), interval 1 day);

+-------------------------------------+

| date_sub(curdate(), interval 1 day) |

+-------------------------------------+

| 2015-03-17                          |

+-------------------------------------+

1 row in set (0.00 sec)

 

6,datediff 返回两个日期间隔的天数

mysql> select datediff('2015-03-18', '2015-03-13');

+--------------------------------------+

| datediff('2015-03-18', '2015-03-13') |

+--------------------------------------+

|                                    5 |

+--------------------------------------+

1 row in set (0.05 sec)

 

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