internal static bool TryParse()

in csharp/src/Drivers/Apache/Hive2/HiveServer2Reader.cs [320:393]
66 lines of code
29 McCabe index (conditional complexity)

        internal static bool TryParse(ReadOnlySpan<byte> date, out DateTimeOffset dateValue)
        {
            bool isKnownFormat = date.Length >= KnownFormatDateTimeLength
                && date[YearMonthSepIndex] == AsciiDash
                && date[MonthDaySepIndex] == AsciiDash
                && date[DayHourSepIndex] == AsciiSpace
                && date[HourMinuteSepIndex] == AsciiColon
                && date[MinuteSecondSepIndex] == AsciiColon;

            if (!isKnownFormat
                || !Utf8Parser.TryParse(date.Slice(YearIndex, 4), out int year, out int bytesConsumed, standardFormat: 'D') || bytesConsumed != 4
                || !Utf8Parser.TryParse(date.Slice(MonthIndex, 2), out int month, out bytesConsumed, standardFormat: 'D') || bytesConsumed != 2
                || !Utf8Parser.TryParse(date.Slice(DayIndex, 2), out int day, out bytesConsumed, standardFormat: 'D') || bytesConsumed != 2
                || !Utf8Parser.TryParse(date.Slice(HourIndex, 2), out int hour, out bytesConsumed, standardFormat: 'D') || bytesConsumed != 2
                || !Utf8Parser.TryParse(date.Slice(MinuteIndex, 2), out int minute, out bytesConsumed, standardFormat: 'D') || bytesConsumed != 2
                || !Utf8Parser.TryParse(date.Slice(SecondIndex, 2), out int second, out bytesConsumed, standardFormat: 'D') || bytesConsumed != 2)
            {
                dateValue = default;
                return false;
            }

            try
            {
                dateValue = new(year, month, day, hour, minute, second, TimeSpan.Zero);
            }
            catch (ArgumentOutOfRangeException)
            {
                dateValue = default;
                return false;
            }

            // Retrieve subseconds, if available
            int length = date.Length;
            if (length > SecondSubsecondSepIndex)
            {
                if (date[SecondSubsecondSepIndex] == AsciiPeriod)
                {
                    int start = -1;
                    int end = SubsecondIndex;
                    while (end < length && (uint)(date[end] - AsciiZero) <= AsciiDigitMaxIndex)
                    {
                        if (start == -1) start = end;
                        end++;
                    }
                    if (end < length)
                    {
                        // Indicates unrecognized trailing character(s)
                        dateValue = default;
                        return false;
                    }

                    int subSecondsLength = start != -1 ? end - start : 0;
                    if (subSecondsLength > 0)
                    {
                        if (!Utf8Parser.TryParse(date.Slice(start, subSecondsLength), out int subSeconds, out _))
                        {
                            dateValue = default;
                            return false;
                        }

                        double factorOfMilliseconds = Math.Pow(10, subSecondsLength - MillisecondDecimalPlaces);
                        long ticks = (long)(subSeconds * (TimeSpan.TicksPerMillisecond / factorOfMilliseconds));
                        dateValue = dateValue.AddTicks(ticks);
                    }
                }
                else
                {
                    dateValue = default;
                    return false;
                }
            }

            return true;
        }