timeConversion.py

def timeConversion(stringg):
    hour = stringg[:2]
    mins = stringg[3:5]
    seconds = stringg[6:8]
    timeconvention = stringg[8:]
    rest = stringg[2:8]
    
    if int(hour) >= 1 and int(hour) <= 12 and int(mins) >= 0 and int(mins) <= 59 and int(seconds) >= 0 and int(seconds) <= 59:
        if(timeconvention == 'PM'):
            if(int(hour) is not 12):
                hour1 = int(hour) + 12
                print(str(hour1) + rest)
                return str(hour1) + rest
            else:
                print(hour + rest)
                return hour + rest
        elif(timeconvention == 'AM'):
            if(int(hour) is not 12):
                print(hour + rest)
                return hour + rest
            else:
                print('00'+rest)
                return '00'+rest
    
    else:
        print("Time is not in correct format")
        return False

timeConversion('12:05:45AM')
timeConversion('02:05:30PM')
timeConversion('08:05:25AM')