The most efficient approach currently involves converting the span slice to chars or relying on the internal logic of GetDateTimeOffset() (which is highly optimized).
// 1. Get the raw string (allocates memory) string dateString = reader.GetString(); utf8jsonreader datetimeoffset rfc 3339
If your JSON source provides dates that look like RFC 3339 but violate the strict standard (e.g., escaping the timezone offset differently or using spaces instead of 'T'), GetDateTimeOffset() will fail. Utf8JsonReader is a high-performance
Utf8JsonReader is a high-performance, low-level JSON reader introduced in .NET Core 3.0. It allows you to read JSON data from a ReadOnlySpan<byte> or a Stream without allocating a string or creating a DOM (Document Object Model). This makes it an ideal choice for parsing large JSON files or streams. GetDateTimeOffset() will fail.
public class Rfc3339DateTimeOffsetParser
When working with JSON data, DateTimeOffset can be used to deserialize date and time values from JSON.