datediff

Description

Syntax

DATETIME DATEDIFF (DATETIME expr1,DATETIME expr2)

Expr1 - expr2 is calculated and the result is accurate to the sky.

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

keyword

DATEDIFF