MySQL:

SUBTIME

Syntax:
SUBTIME(expr1,expr2)

SUBTIME() returns expr1 ? expr2 expressed as a value in the same
format as expr1. expr1 is a time or datetime expression, and expr2 is a
time expression.

URL: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html

Example

mysql> SELECT SUBTIME('2007-12-31 23:59:59.999999','1 1:1:1.000002');
-> '2007-12-30 22:58:58.999997'
mysql> SELECT SUBTIME('01:00:00.999999', '02:00:00.999998');
-> '-00:59:59.999999'

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