Throws an exception if the datetime cannot be converted.

src/OrchardCore/OrchardCore.Abstractions/Json/Serialization/DateTimeJsonConverter.cs

@@ -16,9 +16,15 @@ public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, Jso
             throw new ArgumentException("Unexpected type to convert.", nameof(typeToConvert));
         }
 
-        if (!reader.TryGetDateTime(out var value) && DateTime.TryParse(reader.GetString()!, out value))
+        if (!reader.TryGetDateTime(out var value))
         {
-            return value;
+            var stringValue = reader.GetString(); 
+            if (DateTime.TryParse(stringValue, out value))
+            {
+                return value;
+            }
+
+            throw new JsonException($"Unable to convert \"{stringValue}\" to DateTime.");
         }
 
         return value;

test/OrchardCore.Tests/Data/ContentItemTests.cs

@@ -9,6 +9,24 @@ namespace OrchardCore.Tests.Data;
 
 public class ContentItemTests
 {
+    [Fact]
+    public void NullValueDateTimeFieldSerialisationTest()
+    {
+        // Arrange
+        var jsonStr = """
+         {
+            "NullValueDateTimeFieldTest": {
+                "Value": null 
+            }
+        }
+        """;
+
+        var jobject = JsonNode.Parse(jsonStr);
+
+        var nullValueDateTimeField = jobject.SelectNode("NullValueDateTimeFieldTest").ToObject<DateTimeField>();
+        Assert.Null(nullValueDateTimeField.Value);
+        Assert.Null(JObject.FromObject(nullValueDateTimeField).SelectNode("Value"));
+    }
     /// <summary>
     /// To validate <see cref="DateTimeJsonConverter"/>
     /// and <seealso cref="TimeSpanJsonConverter"/>
@@ -25,6 +43,12 @@ public void JsonNode_WhenParseCalled_ConvertShortTimeFormatToTimeField()
             "DateTimeFieldTest": {
                 "Value": "2024-5-31 13:05"
             },
+            "EmptyValueDateTimeFieldTest": {
+                "Value": ""
+            },
+            "ErrorFormatDateTimeFieldTest": {
+                "Value": "ErrorFormatValue"
+            },
             "TimezoneDateTimeFieldTest": {
                 "Value": "2022-12-13T21:02:18.399-05:00"
             },
@@ -42,13 +66,21 @@ public void JsonNode_WhenParseCalled_ConvertShortTimeFormatToTimeField()
         var timezoneDateTimeFieldTest = jobject.SelectNode("TimezoneDateTimeFieldTest").ToObject<DateTimeField>();
 
         // Assert
+
+        var emptyValueTestexcepion = Assert.Throws<JsonException>(() => jobject.SelectNode("EmptyValueDateTimeFieldTest").ToObject<DateTimeField>());
+        Assert.Equal("Unable to convert \"\" to DateTime.", emptyValueTestexcepion.Message);
+
+        var errorFormatValueTestexcepion = Assert.Throws<JsonException>(() => jobject.SelectNode("ErrorFormatDateTimeFieldTest").ToObject<DateTimeField>());
+        Assert.Equal("Unable to convert \"ErrorFormatValue\" to DateTime.", errorFormatValueTestexcepion.Message);
+
         Assert.Equal("13:05:00", timeField.Value.Value.ToString());
         Assert.Equal("2024-05-31", dateField.Value.Value.ToString("yyyy-MM-dd"));
         Assert.Equal("2024-05-31 13:05", dateTimeField.Value.Value.ToString("yyyy-MM-dd HH:mm"));
         Assert.Equal("13:05:00", JObject.FromObject(timeField).SelectNode("Value").ToString());
         Assert.Equal("2024-05-31T00:00:00Z", JObject.FromObject(dateField).SelectNode("Value").ToString());
         Assert.Equal("2024-05-31T13:05:00Z", JObject.FromObject(dateTimeField).SelectNode("Value").ToString());
 
+
         var utcTime = TimeZoneInfo.ConvertTimeToUtc(timezoneDateTimeFieldTest.Value.Value);
         Assert.Equal("2022-12-14 02:02:18", utcTime.ToString("yyyy-MM-dd HH:mm:ss"));
     }