diff --git a/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
index 5a111f10f..57080b95e 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
@@ -241,7 +241,17 @@ namespace SqlSugar
             var tableName = GetTableName(entityInfo);
             this.Context.MappingTables.Add(entityInfo.EntityName, tableName);
             entityInfo.DbTableName = tableName;
-            entityInfo.Columns.ForEach(it => { it.DbTableName = tableName; });
+            entityInfo.Columns.ForEach(it => {
+                it.DbTableName = tableName;
+                if (it.UnderType?.Name == "DateOnly" && it.DataType == null)
+                {
+                    it.DataType = "Date";
+                }
+                if (it.UnderType?.Name == "TimeOnly" && it.DataType == null)
+                {
+                    it.DataType = "Time";
+                }
+            });
             var isAny = this.Context.DbMaintenance.IsAnyTable(tableName, false);
             if (isAny && entityInfo.IsDisabledUpdateAll)
             {
diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/InsertBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/InsertBuilder.cs
index 5afc651e4..73af85dd9 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/InsertBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/InsertBuilder.cs
@@ -319,7 +319,14 @@ namespace SqlSugar
             {
                 var timeSpan = UtilMethods.DateOnlyToDateTime(columnInfo.Value);
                 var pname = Builder.SqlParameterKeyWord + columnInfo.DbColumnName + "_ts" + GetDbColumnIndex;
-                this.Parameters.Add(new SugarParameter(pname,Convert.ToDateTime(timeSpan)));
+                if (timeSpan == null)
+                {
+                    this.Parameters.Add(new SugarParameter(pname, null) { DbType=System.Data.DbType.Date });
+                }
+                else
+                {
+                    this.Parameters.Add(new SugarParameter(pname, Convert.ToDateTime(timeSpan)));
+                }
                 GetDbColumnIndex++;
                 return pname;
             }
diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/UpdateBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/UpdateBuilder.cs
index e41a470ee..84fa98a6b 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/UpdateBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/UpdateBuilder.cs
@@ -417,7 +417,14 @@ namespace SqlSugar
             {
                 var timeSpan = UtilMethods.TimeOnlyToTimeSpan(columnInfo.Value);
                 var pname = Builder.SqlParameterKeyWord + columnInfo.DbColumnName + "_ts" + GetDbColumnIndex;
-                this.Parameters.Add(new SugarParameter(pname, timeSpan));
+                if (timeSpan == null)
+                {
+                    this.Parameters.Add(new SugarParameter(pname, null) { DbType = System.Data.DbType.Date });
+                }
+                else
+                {
+                    this.Parameters.Add(new SugarParameter(pname, timeSpan));
+                }
                 GetDbColumnIndex++;
                 return pname;
             }