BlogJava-留意生活-文章分类-java基础

计算两个日期之间的天数

liuyimx — Tue, 04 Aug 2009 08:01:00 GMT

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

class Test2 {

    public static String getDate(){

SimpleDateFormat ft = new SimpleDateFormat("yyyy/MM/dd");

Date dd = new Date();

return ft.format(dd);

}

   public static long getQuot(String time1, String time2){

      long quot = 0;

SimpleDateFormat ft = new SimpleDateFormat("yyyy/MM/dd");

     try {

Date date1 = ft.parse( time1 );

Date date2 = ft.parse( time2 );

quot = date1.getTime() - date2.getTime();

quot = quot / 1000 / 60 / 60 / 24;

} catch (ParseException e) {

e.printStackTrace();

}

return quot;

}

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

String date1 = "2008/8/8";

String date2 = getDate();

        long day = getQuot(date1,date2);

System.out.println( "距离 "+date1+" 还有 "+day+" 天" );

}

}

liuyimx 2009-08-04 16:01 发表评论

本月有多少天

liuyimx — Tue, 04 Aug 2009 08:00:00 GMT

Calendar   calendar   =   Calendar.getInstance(); 



calendar.set(calendar.get(Calendar.YEAR), 



calendar.get(Calendar.MONTH),1); 



calendar.roll(Calendar.DATE,   false); 



System.out.println(calendar.get(Calendar.DATE));

liuyimx 2009-08-04 16:00 发表评论

找到本月最后一天

liuyimx — Tue, 04 Aug 2009 07:42:00 GMT

        GregorianCalendar gc = new GregorianCalendar(2009,1,1);//二月1号
        int   maxDate   =   gc.getActualMaximum(Calendar.DATE); //获得二月最后一天对应的int值，28
        int   minDate   =   gc.getActualMinimum(Calendar.DATE);//获得二月第一天对应的int值
        System.out.println(maxDate);
        System.out.println(minDate);
        gc.set(Calendar.DATE, maxDate);//设置gc对应日期为二月最后一天
        System.out.println(gc.getTime());

liuyimx 2009-08-04 15:42 发表评论