fix(#113926): Fix invalid deserialization JsonNode with DateOnly value.

Author: Maximys

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -130,6 +130,7 @@ The System.Text.Json library is built-in as part of the shared framework in .NET
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveByteConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveCharConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveConverter.cs" />
+    <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveDateOnlyConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveDateTimeConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveDateTimeOffsetConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Node\Generics\JsonValuePrimitiveDecimalConverter.cs" />

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Node/Generics/JsonValuePrimitiveDateOnlyConverter.cs

@@ -0,0 +1,24 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Text.Json.Nodes.Generics;
+using System.Text.Json.Serialization.Metadata;
+
+namespace System.Text.Json.Serialization.Converters.Node.Generics
+{
+#if NET
+    internal sealed class JsonValuePrimitiveDateOnlyConverter : JsonValuePrimitiveConverter<DateOnly>
+    {
+        public override JsonValuePrimitive<DateOnly>? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType is JsonTokenType.Null)
+            {
+                return null;
+            }
+
+            DateOnly value = reader.GetDateOnly();
+            return new JsonValuePrimitive<DateOnly>(value, JsonMetadataServices.DateOnlyConverter, null);
+        }
+    }
+#endif
+}

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Node/JsonNodeConverter.cs

@@ -102,6 +102,9 @@ private static JsonConverter PrepareJsonValuePrimitiveConverter(Type valueType)
                 JsonValuePrimitiveKind.Boolean => new JsonValuePrimitiveBooleanConverter(),
                 JsonValuePrimitiveKind.Byte => new JsonValuePrimitiveByteConverter(),
                 JsonValuePrimitiveKind.Char => new JsonValuePrimitiveCharConverter(),
+#if NET
+                JsonValuePrimitiveKind.DateOnly => new JsonValuePrimitiveDateOnlyConverter(),
+#endif
                 JsonValuePrimitiveKind.DateTime => new JsonValuePrimitiveDateTimeConverter(),
                 JsonValuePrimitiveKind.DateTimeOffset => new JsonValuePrimitiveDateTimeOffsetConverter(),
                 JsonValuePrimitiveKind.Decimal => new JsonValuePrimitiveDecimalConverter(),

src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonNode/JsonValueTests.cs

@@ -17,10 +17,10 @@ public static IEnumerable<object[]> GetPrimitiveTypesTwoWaySerializationCases
             get
             {
 #if NET
-                //yield return new object[]
-                //{
-                //    JsonValue.Create(new DateOnly(2025, 4, 16))
-                //};
+                yield return new object[]
+                {
+                    JsonValue.Create(new DateOnly(2025, 4, 16))
+                };
                 yield return new object[]
                 {
                     JsonValue.Create(Half.MaxValue)