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DATEDIFF

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​

mysql> select datediff(CAST('2007-12-31 23:59:59' AS DATETIME), CAST('2007-12-30' AS DATETIME));
+-----------------------------------------------------------------------------------+
| datediff(CAST('2007-12-31 23:59:59' AS DATETIME), CAST('2007-12-30' AS DATETIME)) |
+-----------------------------------------------------------------------------------+
| 1 |
+-----------------------------------------------------------------------------------+

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

keywords​

DATEDIFF