Utf8jsonreader Datetimeoffset Rfc 3339 ((link)) -

var reader = new Utf8JsonReader(json, new JsonReaderOptions AllowTrailingCommas = true ); reader.ReadStartObject(); reader.ReadPropertyName("date"); if (reader.TryReadString(out string dateString))

While both formats express calendar dates and times with time zone offsets, their structural rules vary slightly in strictness: system-text-json-support.md - datetime - GitHub utf8jsonreader datetimeoffset rfc 3339

var reader = new Utf8JsonReader(json, options); var reader = new Utf8JsonReader(json