Time Conversion - Problem from HackerRank

Problem Statement:

Given a time in -hour AM/PM format, convert it to military (-hour) time.

Note: Midnight is  on a -hour clock, and  on a -hour clock. Noon is  on a -hour clock, and  on a -hour clock.

Input Format

A single string containing a time in -hour clock format (i.e.:  or ), where  and .

Output Format

Convert and print the given time in -hour format, where .

Problem Solution using python 2.7.6:

s = raw_input().strip()

def timeconversion(s):

    hh = s.split(':')[0]

    mm = s.split(':')[1]

    ss = s.split(':')[2][:2]

   

    if 'PM' in s.split(':')[2]:

        if int(hh) == 12:

            return hh+':'+mm+':'+ss

        else:           

            hh = 12 + int(hh)           

            if hh >= 24:

                hh = '00'

                return hh+':'+mm+':'+ss

            else:

                return str(hh)+':'+mm+':'+ss

    if 'AM' in s.split(':')[2]:

        if int(hh) == 12:

            return '00'+':'+mm+':'+ss

        else:

            return hh+':'+mm+':'+ss

print timeconversion(s)