throw new JsonException("Invalid RFC 3339 format");
if (DateTimeOffset.TryParse(dateString, out DateTimeOffset dto)) return dto; utf8jsonreader datetimeoffset parsing rfc 3339
DateTimeOffset.TryParse is forgiving. For strict RFC 3339 compliance, use DateTimeOffset.TryParseExact : throw new JsonException("Invalid RFC 3339 format")
⚠️ Stackalloc only safe for reasonably short strings (RFC 3339 ~30 chars). Perfectly safe here. RFC 3339 examples: out DateTimeOffset dto)) return dto