'mysql> SELECT SUBTIME(\'2007-12-31 23:59:59.999999\',\'1 1:1:1.000002\');\n        -> \'2007-12-30 22:58:58.999997\'\nmysql> SELECT SUBTIME(\'01:00:00.999999\', \'02:00:00.999998\');\n        -> \'-00:59:59.999999\'\n','https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html');