[Django]-Django – TimeField difference

First make the fields as DateTimeField as @Chiefir mentioned, this gives you a datetime object.

then,

def hours(self):
        c = self.end_time - self.start_time
        print(c.seconds) 
        # Write your logic to convert seconds to hours.

If you don’t want to make your fields DateTimeFields, you can just do some quick math (assuming your times are in the same day).

def hours(self):
    end_minutes = self.end_hour.hour*60 + self.end_hour.minute
    start_minutes = self. start_hour.hour*60 + self.start_hour.minute
    return (end_minutes - start_minutes) / 60

That will return a float, but you can always round the value. You may also want to check to make sure self.end_hour is greater than self.start_hour.