日期函数Calendar

引用

获取某年的天数：

 public static int getYearFate(Date date){
    	 Calendar cal=Calendar.getInstance(); 
    	 cal.setTime(date);
    	 int ydate=cal.getActualMaximum(Calendar.DAY_OF_YEAR);
    	 return ydate;
    }

引用

前后N个月的月末日期：

 /**前后n 个月的月末
     * @param date
     * @return
     */
    public static Date getMonthAfter(Date date,int n){
    	  Calendar cal=Calendar.getInstance(); 
    	  cal.setTime(date);
    	  cal.add(Calendar.MONTH, n);
    	  cal.set(GregorianCalendar.DAY_OF_MONTH, 1);
    	  cal.roll(Calendar.DAY_OF_MONTH, -1);
    	  return cal.getTime();

    }

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