[Python] ValueError: time data '24:00' does not match format '%H:%M'

I'm having serious trouble converting 24 hour time to 12 hour.

def standard_time(t):
t = datetime.strptime(t, "%H:%M")
return t


When fed in '24:00' we get

ValueError: time data '24:00' does not match format '%H:%M'


I also attempt converting using %I (12 hour) instead of %H, but get an error whenever hours go over 12:

def standard_time(t):
t = datetime.strptime(t, "%I:%M")
return t


Sort of stuck...

ValueError: time data '13:30' does not match format '%I:%M'


Does python have a simple 24 hour to 12 hour converter? Ideally 23:00 should put out 11:00 PM and 24:00 should not throw an error!

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