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timediff

Description​

Returns the difference between two DATETIME expressions.

The return value must be of the TIME type.

Syntax​

TIME TIMEDIFF(DATETIME expr1, DATETIME expr2)`

Examples​

MySQL > SELECT TIMEDIFF(now(),utc_timestamp());
+----------------------------------+
| timediff(now(), utc_timestamp()) |
+----------------------------------+
| 08:00:00                         |
+----------------------------------+

MySQL > SELECT TIMEDIFF('2019-07-11 16:59:30','2019-07-11 16:59:21');
+--------------------------------------------------------+
| timediff('2019-07-11 16:59:30', '2019-07-11 16:59:21') |
+--------------------------------------------------------+
| 00:00:09                                               |
+--------------------------------------------------------+

MySQL > SELECT TIMEDIFF('2019-01-01 00:00:00', NULL);
+---------------------------------------+
| timediff('2019-01-01 00:00:00', NULL) |
+---------------------------------------+
| NULL                                  |
+---------------------------------------+

keyword​

TIMEDIFF