//  Apollo11.java  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2014-12-30  File created.
//  2014-12-30  Last modification.

//  This program is a standard version of my textbook program Columbus.java.
//  With the new standard LocalDate class it is possible to calculate
//  chronological distances in years, months, and days.
//  To compile and run, this program needs JDK 8 or a later version.

import java.time.* ;

class Apollo11
{
   public static void main( String[] not_in_use )
   {
      LocalDate date_of_discovery_of_america = LocalDate.of( 1492, 10, 12 ) ;

      LocalDate date_of_first_moon_landing  =  LocalDate.of( 1969,  7, 20 ) ;

      System.out.printf(
             "\n   Christopher Columbus discovered America on %1$tF"
          +  "\n   That was a %1$tA\n", date_of_discovery_of_america ) ;

      System.out.printf(
             "\n   Apollo 11 landed on the moon on %1$tF"
          +  "\n   That was a %1$tA\n", date_of_first_moon_landing ) ;


      Period  distance_between  =

        date_of_discovery_of_america.until( date_of_first_moon_landing ) ;

      System.out.print( "\n\n   America was discovered "
                  +  distance_between.getYears()   +  " years, "
                  +  distance_between.getMonths()  +  " months, and "
                  +  distance_between.getDays()    +  " days"
                  +  "\n   before the first moon landing.\n" ) ;


   }
}