using System;

using System.Text.Json;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var json = "{\"2023-11-03T00:27:22+00:00\": \"11\"}";

        object obj = JsonSerializer.Deserialize<JsonElement>(json);

        var jsonElement = (JsonElement)obj;

        List<JsonElement> collection = jsonElement.EnumerateArray().ToList();

        DateTimeOffset timestamp = collection[0].EnumerateArray().ToList()[0].GetDateTimeOffset();

        Console.WriteLine(timestamp);

    }

}