feta(ClientOptions): add JsonSerializerDateFormat and JsonSerializerOptions.

src/Leanetec.EConnect.Infrastructure/ClientOptions.cs

@@ -1,4 +1,6 @@
-namespace Leanetec.EConnect.Infrastructure;
+using System.Text.Json;
+
+namespace Leanetec.EConnect.Infrastructure;
 
 public class ClientOptions
 {
@@ -11,4 +13,22 @@ public class ClientOptions
     public Dictionary<string, string?>? DefaultQueryStrings { get; set; }
 
     public Action<HttpClient>? AfterHttpInit { get; set; }
+
+    private string? _jsonSerializerDateFormat = null;
+
+    public string? JsonSerializerDateFormat
+    {
+        get => _jsonSerializerDateFormat;
+        set
+        {
+            _jsonSerializerDateFormat = value;
+            if (value is not null)
+            {
+                JsonSerializerOptions ??= new JsonSerializerOptions();
+                JsonSerializerOptions.Converters.Add(new DateTimeConverter(value));
+            }
+        }
+    }
+
+    public JsonSerializerOptions? JsonSerializerOptions { get; set; }
 }