Fixed a bug with serializing anything using Nullable DateTimes

src/PinguApps.Appwrite.Shared/Constants.cs

@@ -1,5 +1,5 @@
 namespace PinguApps.Appwrite.Shared;
 public static class Constants
 {
-    public const string Version = "1.0.2";
+    public const string Version = "1.0.3";
 }

src/PinguApps.Appwrite.Shared/Converters/NullableDateTimeConverter.cs

@@ -29,5 +29,9 @@ public override void Write(Utf8JsonWriter writer, DateTime? value, JsonSerialize
         {
             _dateTimeConverter.Write(writer, value.Value, options);
         }
+        else
+        {
+            writer.WriteNullValue();
+        }
     }
 }

tests/PinguApps.Appwrite.Shared.Tests/Converters/NullableDateTimeConverterTests.cs

@@ -1,4 +1,5 @@
-using System.Text.Json;
+using System.Text;
+using System.Text.Json;
 using System.Text.Json.Serialization;
 using PinguApps.Appwrite.Shared.Converters;
 
@@ -94,4 +95,23 @@ public void Write_NullDateTimeInObject_WritesNullValue()
         var json = JsonSerializer.Serialize(new NullableDateTimeObject(), _options);
         Assert.Equal("{\"x\":null}", json);
     }
+
+    [Fact]
+    public void Write_WhenValueIsNull_WritesNullValue()
+    {
+        // Arrange
+        var converter = new NullableDateTimeConverter();
+        DateTime? nullDateTime = null;
+
+        using var stream = new MemoryStream();
+        using var writer = new Utf8JsonWriter(stream);
+
+        // Act
+        converter.Write(writer, nullDateTime, _options);
+        writer.Flush();
+
+        // Assert
+        var json = Encoding.UTF8.GetString(stream.ToArray());
+        Assert.Equal("null", json);
+    }
 }