屎弟夫

        /// <summary>
        /// 是否為民國日期
        /// </summary>
        /// <param name="dateStr"></param>
        /// <returns></returns>
        public static bool IsTwDate(this string dateStr)
        {
            CultureInfo tc = new CultureInfo("zh-TW");
            tc.DateTimeFormat.Calendar = new TaiwanCalendar();
            DateTime result;
            if (DateTime.TryParseExact(dateStr, "d", tc, DateTimeStyles.None, out result))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

   /// <summary>
   /// 西元轉民國年
   /// </summary>
   /// <param name="datetime"></param>
   /// <returns></returns>
   public static string ToTaiwanDate(this DateTime datetime)
   {
       TaiwanCalendar taiwanCalendar = new TaiwanCalendar();
 
       return string.Format("{0}/{1}/{2}",
           taiwanCalendar.GetYear(datetime),
           datetime.Month,
           datetime.Day);
   }