DateUtil

DateUtil

 

1.取得当前日期“年”，并判断此年是否为闰年

 

GregorianCalendar gc =  new  GregorianCalendar();

gc.setTime( new  Date());

int  year2 = gc.get(Calendar. YEAR );

System. out .print(year2 +  "为："  + gc.isLeapYear(year2));

 

 

2.得到某日，下一日，下一月等

 

             //得到日

      public  static  int  getDay(Date date) {

           Calendar calendar = Calendar. getInstance();

           calendar.setTime(date);

             return  calendar.get(Calendar.  DATE );

     }

     

      /**

      * 取得两个日期之间的各天数日，开始日期会小于结束日期

      *  @param  beginDate

      *  @param  endDate

      *  @return

      */

      public  List getDates(Date beginDate, Date endDate) {

           List list =  new  ArrayList();

           Date nextDay = beginDate;

           list.add(beginDate);

             while (nextDay.before(endDate)) {

                nextDay = nextDay(nextDay,1);

                list.add(nextDay);

           }

             return  list;

     }

     

             //得到下一天 day可以为正负整数或0

      public  static  Date nextDay(Date date,  int  day) {

           Calendar cal = Calendar. getInstance();

             if  (date !=  null ) {

                cal.setTime(date);

           }

           cal.add(Calendar.  DAY_OF_YEAR , day);

             return  cal.getTime();

     }

 

           //得到下 一月 months可以为正负整数或0

           public  static  Date nextMonth(Date date,  int  months) {

           Calendar cal = Calendar. getInstance();

             if  (date !=  null ) {

                cal.setTime(date);

           }

           cal.add(Calendar.  MONTH , months);

             return  cal.getTime();

     }

 

              //得到下一天 day可以为正负整数或0，并 格式化返回

      public  static  String nextDay(  int  day, String format) {

           Calendar cal = Calendar. getInstance();

           cal.setTime(  new  Date());

           cal.add(Calendar.  DAY_OF_YEAR , day);

             return  dateToString(cal.getTime(), format);

     }

     

      /**

      * 把日期转换为字符串

      *

      *  @param  date

      *  @return

      */

      public  static  String dateToString (java.util.Date date, String format) {

           String result =  "" ;

           SimpleDateFormat formater =  new  SimpleDateFormat(format);

             try  {

                result = formater.format(date);

           }  catch  (Exception e) {

                  // log.error(e);

           }

             return  result;

     }

 

3.得到某年某月最大的天数

      public  static  int  getDaysOfMonth(  int  year,  int  month) {

           Calendar calendar = Calendar.getInstance();

            calendar.set(year, month - 1, 1);

             return  calendar.getActualMaximum(Calendar.  DAY_OF_MONTH );

     }

 

4.得到年

           public  static  int  getYear(Date date) {

           Calendar calendar = Calendar. getInstance();

           calendar.setTime(date);

             return  calendar.get(Calendar.  YEAR );

     }