Introduction

The task is to convert the given time in 12 hour format (AM/PM) into 24 hour format.

Program

def convert(time):
    if time[-2:] == "AM" and time[:2] == "12":
        return "00" + time[2:-2]
    elif time[-2:] == "AM":
        return time[:-2]
    elif time[-2:] == "PM" and time[:2] == "12":
        return time[:-2]
    else:
        return str(int(time[:2])+12 ) + time[2:8]


twelve_hr = ("09:00:16 PM")
print("The provided time in 12 hour format is: ", twelve_hr)
print("The converted time in 24 hour format is: ", convert(twelve_hr))

Output:

Explanation

In the above code we have checked whether the given time is AM or PM. If the time is in PM, we have added 12 to the given time, removed the PM from it and return the time. If the time is in AM, we have just removed the AM from it and returned it.