Quickstarts.TestData.ValidateTimestamp C# (CSharp) Method

        public static DateTime ValidateTimestamp(object formattedValue)
        {
            string value = formattedValue as string;

            if (String.IsNullOrEmpty(value))
            {
                throw new FormatException("Timestamp must not be null.");
            }

            DateTime timestamp = new DateTime(DateTime.Now.Year, 1, 1);

            string[] fields = value.Split(':');

            if (fields == null || fields.Length < 3)
            {
                throw new FormatException("Timestamp must have format 'HH:MM:SS'");
            }

            ushort hours  = Convert.ToUInt16(fields[0]);
            timestamp = timestamp.AddHours(hours);

            if (hours > 23)
            {
                throw new FormatException("The hour must be less than 24.'");
            }

            ushort minutes = Convert.ToUInt16(fields[1]);
            timestamp = timestamp.AddMinutes(minutes);

            if (minutes > 59)
            {
                throw new FormatException("The minute must be less than 60.'");
            }

            var secondsWithMs = fields[2].Split('.');

            double seconds = Convert.ToDouble(secondsWithMs[0]);
            timestamp = timestamp.AddSeconds(seconds);

            if (seconds > 60)
            {
              throw new FormatException("The second must be less than 60.'");
            }

            if (secondsWithMs.Length == 2)
            {
              double milliseconds = Convert.ToDouble(secondsWithMs[1]);
              timestamp.AddMilliseconds(milliseconds);
            }

            return timestamp;
        }