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<Date> getDates(Date beginDate, Date endDate) {

           List<Date> list = new ArrayList<Date>();

           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);

     }