diff --git a/IRaCIS.Core.API/_ServiceExtensions/NewtonsoftJson/JSONTimeZoneConverter.cs b/IRaCIS.Core.API/_ServiceExtensions/NewtonsoftJson/JSONTimeZoneConverter.cs
index 75c5525ab..af0b905b6 100644
--- a/IRaCIS.Core.API/_ServiceExtensions/NewtonsoftJson/JSONTimeZoneConverter.cs
+++ b/IRaCIS.Core.API/_ServiceExtensions/NewtonsoftJson/JSONTimeZoneConverter.cs
@@ -43,20 +43,22 @@ namespace IRaCIS.Core.API
 
         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
         {
-            if (reader.Value == null)
-                return null;
-            else
+            DateTime? nullableDateTime = reader.Value as DateTime?;
+
+            if (nullableDateTime != null && nullableDateTime.HasValue)
             {
                 var dateTime = (DateTime)reader.Value;
 
                 // 将客户端时间转换为服务器时区的时间
                 var serverZoneTime = TimeZoneInfo.ConvertTime(dateTime, _clientTimeZone, TimeZoneInfo.Local);
-            
+
                 return serverZoneTime;
             }
-          
-            // 在反序列化时，我们不需要此转换器，因此不实现此方法
-            //throw new NotImplementedException();
+            else
+            {
+                return null;
+            }
+                      
         }
 
         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)