diff --git a/expression/builtin_time_vec_generated.go b/expression/builtin_time_vec_generated.go
index 9c0f181bbfc8f..87a89e8208cc6 100644
--- a/expression/builtin_time_vec_generated.go
+++ b/expression/builtin_time_vec_generated.go
@@ -746,8 +746,8 @@ func (b *builtinSubDatetimeAndStringSig) vecEvalTime(input *chunk.Chunk, result
 			}
 			return err
 		}
-
 		output, err := arg0.Add(sc, arg1Duration.Neg())
+
 		if err != nil {
 			return err
 		}
diff --git a/expression/generator/time_vec.go b/expression/generator/time_vec.go
index 86a8f6703d8d8..5d18b9a4a17b4 100644
--- a/expression/generator/time_vec.go
+++ b/expression/generator/time_vec.go
@@ -175,12 +175,7 @@ func (b *{{.SigName}}) vecEval{{ .Output.TypeName }}(input *chunk.Chunk, result
 		{{ else }}
 		sc := b.ctx.GetSessionVars().StmtCtx
 		arg1Duration := types.Duration{Duration: arg1, Fsp: -1}
-		arg1time, err := arg1Duration.ConvertToTime(sc, mysql.TypeDatetime)
-		if err != nil {
-			return err
-		}
-		tmpDuration := arg0.Sub(sc, &arg1time)
-		output, err := tmpDuration.ConvertToTime(sc, arg0.Type())
+		output, err := arg0.Add(sc, arg1Duration.Neg())
 		{{ end }}
 		if err != nil {
 			return err
@@ -205,12 +200,7 @@ func (b *{{.SigName}}) vecEval{{ .Output.TypeName }}(input *chunk.Chunk, result
 			}
 			return err
 		}
-		arg1time, err := arg1Duration.ConvertToTime(sc, mysql.TypeDatetime)
-		if err != nil {
-			return err
-		}
-		tmpDuration := arg0.Sub(sc, &arg1time)
-		output, err := tmpDuration.ConvertToTime(sc, mysql.TypeDatetime)
+		output, err := arg0.Add(sc, arg1Duration.Neg())
 		{{ end }}
 		if err != nil {
 			return err