[Code] 處理民國年

// Program.cs
CultureInfo.DefaultThreadCurrentCulture = new CultureInfo("zh-TW")
{
    DateTimeFormat = { Calendar = new TaiwanCalendar() }
};

string dtestr1 = "1010229";
// ParseExact 的時候，民國年的年分要補成4碼，3碼不合法
var dte1 = DateTime.ParseExact(dtestr1.PadLeft(8, '0'), "yyMMdd", CultureInfo.CurrentCulture);
var cedte = dte1.ToString("yyyy/MM/dd");

var dtestr2 = "20230508";
var dte2 = DateTime.ParseExact(dtestr2, "yyyyMMdd", CultureInfo.InvariantCulture);
var rocdte = dte2.ToString("yyMMdd");