Use CultureInfo.CurrentUICulture of DateTime JSON converter.

framework/src/Volo.Abp.Json/Volo/Abp/Json/SystemTextJson/JsonConverters/AbpDateTimeConverter.cs

@@ -26,15 +26,15 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
                 if (reader.TokenType == JsonTokenType.String)
                 {
                     var s = reader.GetString();
-                    if (DateTime.TryParseExact(s, _options.DefaultDateTimeFormat, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out var d1))
+                    if (DateTime.TryParseExact(s, _options.DefaultDateTimeFormat, CultureInfo.CurrentUICulture, DateTimeStyles.None, out var d1))
                     {
                         return  _clock.Normalize(d1);
                     }
 
-                    throw new JsonException($"{s} cannot parse to DateTime({_options.DefaultDateTimeFormat})!");
+                    throw new JsonException($"'{s}' can't parse to DateTime({_options.DefaultDateTimeFormat})!");
                 }
 
-                throw new JsonException("reader TokenType is not String!");
+                throw new JsonException("Reader's TokenType is not String!");
             }
 
             if (reader.TryGetDateTime(out var d2))
@@ -42,7 +42,7 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
                 return  _clock.Normalize(d2);
             }
 
-            throw new JsonException("reader can't get datetime!");
+            throw new JsonException("Can't get datetime from the reader!");
         }
 
         public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
@@ -53,7 +53,7 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
             }
             else
             {
-                writer.WriteStringValue(_clock.Normalize(value).ToString(_options.DefaultDateTimeFormat));
+                writer.WriteStringValue(_clock.Normalize(value).ToString(_options.DefaultDateTimeFormat, CultureInfo.CurrentUICulture));
             }
         }
     }

framework/src/Volo.Abp.Json/Volo/Abp/Json/SystemTextJson/JsonConverters/AbpHasExtraPropertiesJsonConverter.cs

@@ -30,7 +30,7 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
                 return extensibleObject;
             }
 
-            throw new JsonException("RootElement ValueKind is not Object!");
+            throw new JsonException("RootElement's ValueKind is not Object!");
         }
 
         public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)

framework/src/Volo.Abp.Json/Volo/Abp/Json/SystemTextJson/JsonConverters/AbpNullableDateTimeConverter.cs

@@ -26,15 +26,15 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
                 if (reader.TokenType == JsonTokenType.String)
                 {
                     var s = reader.GetString();
-                    if (DateTime.TryParseExact(s, _options.DefaultDateTimeFormat, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out var d1))
+                    if (DateTime.TryParseExact(s, _options.DefaultDateTimeFormat, CultureInfo.CurrentUICulture, DateTimeStyles.None, out var d1))
                     {
                         return  _clock.Normalize(d1);
                     }
 
-                    throw new JsonException($"{s} cannot parse to DateTime({_options.DefaultDateTimeFormat})!");
+                    throw new JsonException($"'{s}' can't parse to DateTime({_options.DefaultDateTimeFormat})!");
                 }
 
-                throw new JsonException("reader TokenType is not String!");
+                throw new JsonException("Reader's TokenType is not String!");
             }
 
             if (reader.TryGetDateTime(out var d2))
@@ -59,7 +59,7 @@ namespace Volo.Abp.Json.SystemTextJson.JsonConverters
                 }
                 else
                 {
-                    writer.WriteStringValue(_clock.Normalize(value.Value).ToString(_options.DefaultDateTimeFormat));
+                    writer.WriteStringValue(_clock.Normalize(value.Value).ToString(_options.DefaultDateTimeFormat, CultureInfo.CurrentUICulture));
                 }
             }
         }

framework/test/Volo.Abp.Json.Tests/Volo/Abp/Json/AbpSystemTextJsonSerializerProvider_Tests.cs

@@ -152,7 +152,7 @@ namespace Volo.Abp.Json
         }
 
         [Fact]
-        public void Serialize_Deserialize_ExtensibleObject_With_ExtraProperties_String()
+        public void Serialize_Deserialize_ExtensibleObject_Without_String()
         {
             var json = "{\"name\":\"test\"}";
             var extensibleObject = JsonSerializer.Deserialize<TestExtensibleObjectClass>(json);
@@ -160,6 +160,24 @@ namespace Volo.Abp.Json
             extensibleObject.ExtraProperties.ShouldBeEmpty();
         }
 
+        [Fact]
+        public void Serialize_Deserialize_ExtensibleObject_Without_Empty()
+        {
+            var json = "{\"name\":\"test\",\"extraProperties\":{}}";
+            var extensibleObject = JsonSerializer.Deserialize<TestExtensibleObjectClass>(json);
+            extensibleObject.ExtraProperties.ShouldNotBeNull();
+            extensibleObject.ExtraProperties.ShouldBeEmpty();
+        }
+
+        [Fact]
+        public void Serialize_Deserialize_ExtensibleObject_Without_Null()
+        {
+            var json = "{\"name\":\"test\",\"extraProperties\":null}";
+            var extensibleObject = JsonSerializer.Deserialize<TestExtensibleObjectClass>(json);
+            extensibleObject.ExtraProperties.ShouldNotBeNull();
+            extensibleObject.ExtraProperties.ShouldBeEmpty();
+        }
+
         [Fact]
         public void Serialize_Deserialize_With_Datetime()
         {

framework/test/Volo.Abp.MemoryDb.Tests/Volo/Abp/MemoryDb/JsonConverters/EntityJsonConverter.cs

@@ -27,7 +27,7 @@ namespace Volo.Abp.MemoryDb.JsonConverters
                 return entity;
             }
 
-            throw new JsonException("RootElement ValueKind is not Object!");
+            throw new JsonException("RootElement's ValueKind is not Object!");
         }
 
         public override void Write(Utf8JsonWriter writer, TEntity value, JsonSerializerOptions options)