Getting the difference between two times in a Data Frame

[scidam]

I am trying to remember why I did create so sophisticated answer, but no success; In any case, I think that the expected by the OP answer would be something like min(delta.seconds, (-delta).seconds), where delta is difference between two datetime objects. So, the difference between two times 23:59:00 and 00:00:01 should be 61 sec.