/**
 * 比較兩個日期之間的大小
 *
 * @param d1
 * @param d2
 * @return 前者大於後者返回true 反之false
 */
public static boolean compareDate(Date d1, Date d2) {
   Calendar c1 = Calendar.getInstance();
   Calendar c2 = Calendar.getInstance();
   c1.setTime(d1);
   c2.setTime(d2);

   int result = c1.compareTo(c2);
   if (result >= 0)
      return true;
   else
      return false;
}
 

/**
 * 比較兩個時間大小
 * @param beginTime
 * @param endTime
 * @return
 */
public String comparetoTime(String beginTime,String endTime) throws ParseException{
   SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
   Date bt=sdf.parse(beginTime);
   Date et=sdf.parse(endTime);
   if (bt.before(et)){
      return "true";
   }else{
      if(beginTime.equals(endTime)){
         return "true";
      }else{
         return "false";
      }
   }
}