Java 判断两个日期相差多少天详解编程语言

import java.util.Calendar; 
 
public class DateDifferent{     
    public static void main(String[] args){ 
    Calendar calendar1 = Calendar.getInstance(); 
    Calendar calendar2 = Calendar.getInstance(); 
    calendar1.set(2014, 01, 10); 
    calendar2.set(2014, 07, 01); 
    long milliseconds1 = calendar1.getTimeInMillis(); 
    long milliseconds2 = calendar2.getTimeInMillis(); 
    long diff = milliseconds2 - milliseconds1; 
    long diffSeconds = diff / 1000; 
    long diffMinutes = diff / (60 * 1000); 
    long diffHours = diff / (60 * 60 * 1000); 
    long diffDays = diff / (24 * 60 * 60 * 1000); 
    System.out.println("/nThe Date Different Example"); 
    System.out.println("Time in milliseconds: " + diff + " milliseconds."); 
    System.out.println("Time in seconds: " + diffSeconds + " seconds."); 
    System.out.println("Time in minutes: " + diffMinutes + " minutes."); 
    System.out.println("Time in hours: " + diffHours + " hours."); 
    System.out.println("Time in days: " + diffDays + " days."); 
  } 
}