def timeConversion(s):
    # get the time indicator
    time_indicator = s[-2:]
    
    # extract minutes and seconds because they stay fixed
    # format (e.g.): ":00:00"
    mins_secs = s[2:-2]
    
    # extract hour (the thing to alter if necessary)
    hour = s[:2]
    
    # handle edge cases (i.e. 12)
    if hour == "12":
        if time_indicator == "AM":
            military_time = "00" + mins_secs
        else:
            military_time = hour + mins_secs
    # all the other hours
    else:
        if time_indicator == "AM":
            military_time = hour + mins_secs
        else:
            # add leading zero if not already two digits
            adjusted_hour = "{:0>2}".format(str(int(hour) + 12))
            military_time = adjusted_hour + mins_secs
            
    return military_time