forrajeando fechas, java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static String timeConversion(String s) {
        // Complete this function
        int arrlength = 4;
        int dateArrLength = 3;
        String res;
        
        int dateArr[] = new int[3];
        String dataArr[] = new String[4];
        dataArr = s.split(":");
        
        for (int i = 0; i < dateArrLength-1; i++) {
            dateArr[i] = Integer.parseInt(dataArr[i]);
        }
        
        dateArr[2] = Integer.parseInt(dataArr[2].substring(0, 2));
        
        if (dataArr[2].substring(2, 4).equals("PM")) {
            if (dateArr[0] == 12)
                dateArr[0] = 0;
            else
                dateArr[0] += 12;           
        }
        
        
        
        res = dateArr[0]+":"+dateArr[1]+":"+dateArr[2];
        
        return res;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        String result = timeConversion(s);
        System.out.println(result);
    }
}