//  DaysSince19700101.java  Copyright (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2005-06-22   File created.
//  2005-06-22   Last modification.


import java.util.* ;

class DaysSince19700101
{
   public static void main( String[] not_in_use )
   {
      Date  date_to_increment  =  new  Date( 1, 1, 1970 ) ;

      CurrentDate  date_today  =  new  CurrentDate() ;

      int   day_counter  =  0 ;

      while  (  date_to_increment.is_earlier_than( date_today )  )
      {
         date_to_increment.increment() ;
         day_counter  ++ ;
      }

      System.out.print(  "\n  Today it is "  +  date_today ) ;

      System.out.print(  "\n  Since 1970-01-01 "  +  day_counter 
                      +  " days have passed. " ) ;

      long  milliseconds_since_19700101  =

               day_counter  *  24L * 60L * 60000L ;

      System.out.print(  "\n  That is " 
                     +   milliseconds_since_19700101  +  " milliseconds." ) ;

      long  milliseconds_since_19700101_gmt  =  System.currentTimeMillis() ;

      System.out.print(  "\n  System.currentTimeMillis() gives the following " 
                     +   "\n  value   "
                +   milliseconds_since_19700101_gmt  +  " milliseconds (GMT)" );

      long  difference_in_milliseconds  =
                                 milliseconds_since_19700101_gmt  -
                                 milliseconds_since_19700101 ;

      if ( difference_in_milliseconds  <  0 )
      {
         difference_in_milliseconds  =  -difference_in_milliseconds ;
      }

      System.out.printf( "\n  The difference is %d hours %02d minutes, "
                      +  "\n  and %02d.%03d seconds.",
              difference_in_milliseconds / (60L * 60000L ),
              ( difference_in_milliseconds % (60L * 60000L ) ) / 60000L,
              ( difference_in_milliseconds % 60000L ) / 1000L,
              difference_in_milliseconds % 1000L ) ;

      Calendar  gregorian_calendar_now  =  new  GregorianCalendar() ;

      System.out.printf( "\n  GregorianCalendar now    %tc ",
                         gregorian_calendar_now ) ;
   }  
}