System.DateTimeParse.ParseISO8601 C# (CSharp) Method

        private static bool ParseISO8601(ref DateTimeRawInfo raw, ref __DTString str, DateTimeStyles styles, ref DateTimeResult result) {
            if (raw.year < 0 || raw.GetNumber(0) < 0 || raw.GetNumber(1) < 0) {
            }
            str.Index--;
            int hour, minute;
            int second = 0;
            double partSecond = 0;

            str.SkipWhiteSpaces();
            if (!ParseDigits(ref str, 2, out hour)) {
                result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                return false;
            }
            str.SkipWhiteSpaces();
            if (!str.Match(':')) {
                result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                return false;
            }
            str.SkipWhiteSpaces();
            if (!ParseDigits(ref str, 2, out minute)) {
                result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                return false;
            }
            str.SkipWhiteSpaces();
            if (str.Match(':')) {
                str.SkipWhiteSpaces();
                if (!ParseDigits(ref str, 2, out second)) {
                    result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                    return false;
                }
                if (str.Match('.')) {
                    if (!ParseFraction(ref str, out partSecond)) {
                        result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                        return false;
                    }
                    str.Index--;
                }
                str.SkipWhiteSpaces();
            }
            if (str.GetNext()) {
                char ch = str.GetChar();
                if (ch == '+' || ch == '-') {
                    result.flags |= ParseFlags.TimeZoneUsed;
                    if (!ParseTimeZone(ref str, ref result.timeZoneOffset)) {
                        result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                        return false;
                    }
                } else if (ch == 'Z' || ch == 'z') {
                    result.flags |= ParseFlags.TimeZoneUsed;
                    result.timeZoneOffset = TimeSpan.Zero;
                    result.flags |= ParseFlags.TimeZoneUtc;
                } else {
                    str.Index--;
                }
                str.SkipWhiteSpaces();
                if (str.Match('#')) {
                    if (!VerifyValidPunctuation(ref str)) {
                        result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                        return false;                        
                    }
                    str.SkipWhiteSpaces();
                }
                if (str.Match('\0')) {
                    if (!VerifyValidPunctuation(ref str)) {
                        result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                        return false;                        
                    }
                }
                if (str.GetNext()) {                
                    // If this is true, there were non-white space characters remaining in the DateTime
                    result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
                    return false;
                }
            }

            DateTime time;
            Calendar calendar = GregorianCalendar.GetDefaultInstance();
            if (!calendar.TryToDateTime(raw.year, raw.GetNumber(0), raw.GetNumber(1),
                    hour, minute, second, 0, result.era, out time)) {
                result.SetFailure(ParseFailureKind.FormatBadDateTimeCalendar, "Format_BadDateTimeCalendar", null);
                return false;
            }
            
            time = time.AddTicks((long)Math.Round(partSecond * Calendar.TicksPerSecond));
            result.parsedDate = time;
            if (!DetermineTimeZoneAdjustments(ref result, styles, false)) {
                return false;
            }
            return true;
        }