日期工具

1. 增加或减少天数

publicDate addDay(Date date,int num) {

   Calendar calendar =Calendar.getInstance();

   calendar.setTime(date);

   calendar.add(Calendar.DAY_OF_MONTH, num);

   return calendar.getTime();

}

 

2. String与Date相互转换

   2.1. String → Date:

    2.1.1.Date date =newDate(“2014-01-01”);

    2.1.2.SimpleDateFormat sdf =newSimpleDateFormat(“yyyy-MM-dd”);

              String str =“2014-01-01”;

  Date date = sdf.parse(str);

   2.2. Date → String

SimpleDateFormat sdf =newSimpleDateFormat(“yyyy-MM-dd”);   

Date date =newDate();

String str = sdf.format(date);