// file:      testDate.java
// author:    Robert Keller
// purpose:   demonstrating Date class
// operation: The user types dates consisting of a month, day, and year 
//            The program indicates the age of a person born on that date.  
//            The month is a number from 1 to 12, the day from 1 to 31, 
//            and the number of the year since 1900.

import java.util.Date;
import java.io.*;

class testDate
{

static final long msPerYear = 31536000000L;

static PrintStream out = System.out;

static boolean prompt()
  {
  out.print("Please enter month day and year since 1900, e.g. 2 16 98: ");
  out.flush();
  return true;
  }

static public void main(String arg[])
  {
  out.println("testDate returns age in years of person born on date entered.");
  out.println();

  StreamTokenizer in = new StreamTokenizer(System.in);

  while( prompt() )
    {
    try
      {
      if( in.nextToken() == StreamTokenizer.TT_EOF ) break;
      int month = (int)in.nval - 1;	// months go from 0 to 11

      if( in.nextToken() == StreamTokenizer.TT_EOF ) break;
      int day = (int)in.nval;

      if( in.nextToken() == StreamTokenizer.TT_EOF ) break;
      int year = (int)in.nval;	// years 

      int correction = year < 70 ? 70-year : 0;	// year of Date must be >= 70

      Date date = new Date(year + correction, month, day);

      long ms = System.currentTimeMillis() - date.getTime();
      out.println(ms/msPerYear + correction);
      }
    catch( IOException e )
      {
      System.err.println("IOException caught");
      System.exit(1);
      }
    }
  out.println();
  }
}