datediff

Description

Syntax

INT DATEDIFF (DATETIME expr1, DATETIME expr2)

Calculate expr1 - expr2, the result is accurate to the unit of a day.

Expr1 and expr2 parameters are valid date or date/time expressions.

Note: Only the date part of the value participates in the calculation.

example

1. mysql> select datediff(CAST('2007-12-31 23:59:59' AS DATETIME), CAST('2007-12-30' AS DATETIME));
2. +-----------------------------------------------------------------------------------+
3. | datediff(CAST('2007-12-31 23:59:59' AS DATETIME), CAST('2007-12-30' AS DATETIME)) |
4. +-----------------------------------------------------------------------------------+
5. |                                                                                 1 |
6. +-----------------------------------------------------------------------------------+

8. mysql> select datediff(CAST('2010-11-30 23:59:59' AS DATETIME), CAST('2010-12-31' AS DATETIME));
9. +-----------------------------------------------------------------------------------+
10. | datediff(CAST('2010-11-30 23:59:59' AS DATETIME), CAST('2010-12-31' AS DATETIME)) |
11. +-----------------------------------------------------------------------------------+
12. |                                                                               -31 |
13. +-----------------------------------------------------------------------------------+

keywords

1. DATEDIFF