what's wrong with this code for date with month names in convert us to eu date?i can get to work with simple date.

Question

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String date=sc.nextLine();
String[] m={"1","2","3","4","5","6","7","8","9","10","11","12"};
String[] m1={"January","February","March","April","May","June","July","August","September","October","November","December"};
if(date.contains(" ")){

String usdate1=date.replaceAll(", ","/").replaceAll(" ","/");
String [] usdate2=usdate1.split("/");
String day=usdate2[1];
String month=usdate2[0];
String year=usdate2[2];
String eudate=day+"/"+month+"/"+year;}
for(int i=0;i<=m1.length-1;i++){
String eudate1=eudate.replaceAll(m1[i],m[i]);}

System.out.println(eudate1);
}
}