Utf8jsonreader | Datetimeoffset Parsing Rfc 3339 !!install!!

// Fallback: manual strict parsing ReadOnlySpan<byte> span = reader.ValueSpan; Span<char> chars = stackalloc char[span.Length]; int len = Encoding.UTF8.GetChars(span, chars); if (DateTimeOffset.TryParseExact(chars.Slice(0, len), "yyyy-MM-dd'T'HH:mm:ss.FFFFFFFK", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind, out dto)) return dto;