Change time of day(24 hour format hhmm) to minutes and minutes to time of day (hh:mm).
How to install:
Ex1: input: 120 minutes output: 2:00 (hh:mm)
minute2time(120) 2:00
Ex2 :
input: 1200 (hhmm) output: 720 minutes
time2min(1200) 720
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