diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/Models/user_name_simple.cs b/Src/Asp.Net/SqlServerTest/UnitTest/Models/user_name_simple.cs
index b040cc8bc..a62507f9b 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/Models/user_name_simple.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/Models/user_name_simple.cs
@@ -12,7 +12,7 @@ namespace SqlSugarDemo
 
         public int id { set; get; }
         public string name { set; get; }
-        public DateTime create_time { set; get; }
+        public DateTime? create_time { set; get; }
     }
 
  
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOne12.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOne12.cs
index 98fe56b8b..87f2239af 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOne12.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOne12.cs
@@ -55,6 +55,11 @@ namespace OrmTest
             {
                 throw new Exception("unit error");
             }
+            var list2=db.Queryable<poetry_video_comment>()
+                .Select(it => new
+                {
+                    y= it.UserInfo.create_time .Value.ToString("yyyy-MM-dd")
+                }).ToList();
         }
     }
 }