Something

import java.io.*;import java.util.*;public class SimpleMyTime{	//Initiate the BufferedReader to get user input	public static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));	public static void main(String[] args) throws IOException	{		Calendar cal = new GregorianCalendar();		Date dt = null;		System.out.println("Please enter your birthdate in mm//dd//yyyy format:");		String dateS = stdin.readLine();		int length = dateS.length();		String[] date = new String(dateS).split("\\/");		String month=date[0];		String day=date[1];		String year=date[2];		if (length > 10 | length < 10)		{			System.out.println("You did not enter the date in mm//dd//yyyy format!");			return;		}		else		{			System.out.println("Wait...");		}		int useryear = Integer.parseInt(year);		int usermonth = Integer.parseInt(month);		int userday = Integer.parseInt(day);		int currentyear = cal.get(Calendar.YEAR);		/*int currentmonth = cal.get(Calendar.MONTH);		int currentday = cal.get(Calendar.DAY_OF_MONTH);*/		System.out.println("You are " + (currentyear - useryear) + " years old");		Date userdate = new GregorianCalendar(useryear, usermonth, userday,00,00,00).getTime();		Date today = new Date();		Calendar curDay = Calendar.getInstance();		Calendar userDay = Calendar.getInstance();		userDay.set(useryear, usermonth, userday);		long msPerDay = 86400000;		long diff = ( curDay.getTimeInMillis() - userDay.getTimeInMillis() ) / msPerDay;		System.out.println("The 21st century (up to " + today + ") is "		+ (diff) + " days old.");				}	}