def timeConversion(s):
    h = int(s[:2])
    msec = s[2:8]
    h = h % 12 if s[-2:] == 'AM' else h % 12 + 12
    return f"{h:02}{msec}"

    public static string timeConversion(string s)
    {
        var date = DateTime.Parse(s);
        return date.ToString("HH:mm:ss");
    }

string timeConversion(string s) {
 int pos = s.find(":");
 int t = stoi(s.substr(0,pos));
 string r = s.substr(8,2);
if(t == 12 && r =="AM")return "00"+s.substr(pos,6);
else if(t <12 && r=="PM")return to_string((t+12))+s.substr(pos,6);
else return s.substr(0,8);
}

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;

class Result {

    private static final DateFormat TWELVE_TF = new SimpleDateFormat("hh:mm:ssa");
    private static final DateFormat TWENTY_FOUR_TF = new SimpleDateFormat("HH:mm:ss");

    public static String timeConversion(String s) {
        try {
            return TWENTY_FOUR_TF.format(
                    TWELVE_TF.parse(s));
        } catch (ParseException e) {
            return s;
        }
    }

}

function timeConversion(s) {
    // Write your code here
    let hours = s.substr(0, 2);
    let minutes = s.substr(3, 2);
    let seconds = s.substr(-4, 2);
    let modifier = s.substr(-2, 2);
    if (hours === '12') {
        hours = '00';
    }
    if (modifier === 'PM') {
        hours = parseInt(hours, 10) + 12;
    }
    let time = `${hours}:${minutes}:${seconds}`;
    return time;

}