MySQL Date Diff за секунды
SELECT TIME_TO_SEC(TIMEDIFF('2021-05-22 12:00:00', '2021-05-22 12:00:37')) as diff_in_seconds;
Friendly Hawk
SELECT TIME_TO_SEC(TIMEDIFF('2021-05-22 12:00:00', '2021-05-22 12:00:37')) as diff_in_seconds;