使用Calendar类查找日期和时间之间的间隔

import java.util.Calendar;

import java.util.Date;
/*来自 
 nowjava.com - 时代Java*/

import java.util.concurrent.TimeUnit;


public class Main {


  public static void main(String[] args) {

    Calendar cal1 = Calendar.getInstance();

    Calendar cal2 = Calendar.getInstance();


    // Set the date to 01/01/2010:12:00

    cal2.set(2010, 0, 1, 12, 0);

    Date date1 = cal2.getTime();

    System.out.println(date1);


    long mill = Math.abs(cal1.getTimeInMillis() - date1.getTime());

    // Convert to hours

    long hours = TimeUnit.MILLISECONDS.toHours(mill);/**时 代 J a v a**/

    // Convert to days

    Long days = TimeUnit.HOURS.toDays(hours);

    String diff = String.format("%d hour(s) %d min(s)",hours,TimeUnit.MILLISECONDS.toMinutes(mill) - TimeUnit.HOURS.toMinutes(hours));

    System.out.println(diff);


    diff = String.format("%d days", days);

    System.out.println(diff);