private Boolean IsValidTime(String time)
 {
     return(DateTimeParser.ParseTime(time) != null);
 }
 private Boolean IsValidDateTime(String datetime)
 {
     return(DateTimeParser.ParseDateTime(datetime) != null);
 }
        private async Task OrderCustomDateTimeApply_Entry(String datetime)
        {
            var datetext = DateTimeParser.ParseDateTime(datetime);

            this.dateTime = DateTime.ParseExact(datetext, "yyyy-MM-dd HH:mm", CultureInfo.InvariantCulture);
        }