NLog.Targets.FileTarget.TryParseDateAndSequence C# (CSharp) Method

        private static bool TryParseDateAndSequence(string archiveFileNameWithoutPath, string dateFormat, FileNameTemplate fileTemplate, out DateTime date, out int sequence)
        {
            int trailerLength = fileTemplate.Template.Length - fileTemplate.EndAt;
            int dateAndSequenceIndex = fileTemplate.BeginAt;
            int dateAndSequenceLength = archiveFileNameWithoutPath.Length - trailerLength - dateAndSequenceIndex;

            if (dateAndSequenceLength < 0)
            {
                date = default(DateTime);
                sequence = 0;
                return false;
            }
            string dateAndSequence = archiveFileNameWithoutPath.Substring(dateAndSequenceIndex, dateAndSequenceLength);
            int sequenceIndex = dateAndSequence.LastIndexOf('.') + 1;

            string sequencePart = dateAndSequence.Substring(sequenceIndex);
            if (!Int32.TryParse(sequencePart, NumberStyles.None, CultureInfo.CurrentCulture, out sequence))
            {
                date = default(DateTime);
                return false;
            }

            var dateAndSequenceLength2 = dateAndSequence.Length - sequencePart.Length - 1;
            if (dateAndSequenceLength2 < 0)
            {
                date = default(DateTime);
                return false;
            }

            string datePart = dateAndSequence.Substring(0, dateAndSequenceLength2);
            if (!DateTime.TryParseExact(datePart, dateFormat, CultureInfo.CurrentCulture, DateTimeStyles.None,
                out date))
            {
                return false;
            }

            return true;
        }