计算某天n月之后的日期

public static java.util.Date getBeforeAfterDateMonth(Date date, int month) {  
       
        Calendar cal = new GregorianCalendar();  
        cal.setTime(date);  
  
        int Year = cal.get(Calendar.YEAR);  
        int Month = cal.get(Calendar.MONTH);  
        int Day = cal.get(Calendar.DAY_OF_MONTH);  
  
        int NewMonth = Month + month;  
  
        cal.set(Calendar.YEAR, Year);  
        cal.set(Calendar.MONTH, NewMonth);  
        cal.set(Calendar.DAY_OF_MONTH, Day);  
  
        return new Date(cal.getTimeInMillis());  
    }