What's wrong with this edge case code?

Question

Hi, I am having issues with an exercise- i don't think I'm catching edge cases but in codecoach the other tests are hidden so can't tell what's wrong at the moment. As always thanks for your input fellow learners

https://www.sololearn.com/coach/70?ref=app
https://code.sololearn.com/ckAqbJ97dDk3/?ref=app

Answer 1

Ok noted! So it was edge cases then. Thanks for the insights

Answer 2

first observation :
12:00 AM is supposed to be 00:00 not 12:00.

Answer 3

Updated code to reflect edge cases. An error still occurs on case 3