Transforming seconds into hours

easy, it's the number of seconds since midnight. So:
ex: 56123 = ??
you divide by 3600, it gives you 15.589 so 15h
you round the remainder to 0.59 which you then multiply by 60 to get the minutes which is 35.4, rounded down - 35
56123 = 15h35
QED;;;with a year delay but oh well...