forrajeando fechas.java

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package javaapplication1;
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

/**
 *
 * @author B15S02est
 */
public class JavaApplication1 {

    static String timeConversion(String s) {
        // Complete this function
        int arrlength = 4;
        String res;
        String isPm;
        int hour;
        String hourstr;
        
        String dataArr[] = new String[3];
        dataArr = s.split(":");
        hourstr = "";
        
        isPm = dataArr[2].substring(2);
        
        dataArr[2] = dataArr[2].substring(0, 2);
        hour = Integer.parseInt(dataArr[0]);
        
        
        if (isPm.equals("AM")) {
            if (hour == 12)
                hour = 0;                     
        }
        else if (isPm.equals("PM")) {
            if (hour == 12)
                hour = 12;
            else
                hour += 12;
        }
        
        hourstr = String.valueOf(hour);
        if (hour < 10) {
            hourstr = "0"+hour;
        }
        
        res = hourstr+":"+dataArr[1]+":"+dataArr[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);
    }
    
}