java中Date的一些用法

-----------------------------------------------返回時間差

 

import java.text.*;

import java.util.Date;

public class Demo {
 public static void main(String[] args) throws Exception {

  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  Date begin = df.parse("2004-01-02 11:30:24");
  Date end = df.parse("2004-03-26 13:31:40");
  long between = (end.getTime() - begin.getTime()) / 1000;// 除以1000是為了轉換成秒
  long day = between / (24 * 3600);//天
  long hour = between % (24 * 3600) / 3600;//小時
  long minute = between % 3600 / 60;//分鐘
  long second = between % 60 / 60;//秒
  
  System.out.println(day+"天"+hour+"小時"+minute+"分鐘"+second+"秒");
  
  
 }
}

 

------------------------------------------------------------獲得Date對象中的資訊

 

                            Date d2 = new Date();

                   //年份

                   int year = d2.getYear() + 1900;

                   //月份

                   int month = d2.getMonth() + 1;

                   //日期

                   int date = d2.getDate();

                   //小時

                   int hour = d2.getHours();

                   //分鐘

                   int minute = d2.getMinutes();

                   //秒

                   int second = d2.getSeconds();

                   //星期幾

                   int day = d2.getDay();

                   System.out.println("年份：" + year);

                   System.out.println("月份：" + month);

                   System.out.println("日期：" + date);

                   System.out.println("小時：" + hour);

                   System.out.println("分鐘：" + minute);

                   System.out.println("秒：" + second);

                   System.out.println("星期：" + day);

----------------------------------------------------------------

       import java.util.*;

 

/**

 * 計算兩個日期之間相差的天數

 */

public class DateExample1 {

         public static void main(String[] args) {

                   //設定兩個日期

                   //日期：2009年3月11號

                   Calendar c1 = Calendar.getInstance();

                   c1.set(2009, 3 - 1, 11);

                   //日期：2010年4月1號

                   Calendar c2 = Calendar.getInstance();

                   c2.set(2010, 4 - 1, 1);

                   //轉換為相對時間

                   long t1 = c1.getTimeInMillis();

                   long t2 = c2.getTimeInMillis();

                   //計算天數

                   long days = (t2 - t1)/(24 * 60 * 60 * 1000);

                   System.out.println(days);

         }

}

 部分代碼來自:http://blog.csdn.net/Mailbomb/archive/2009/03/10/3976465.aspx