minor types.DateTime optimizations to minimize time.Time value copies

tools/types/datetime.go

@@ -45,10 +45,11 @@ func (d DateTime) IsZero() bool {
 //
 // The zero value is serialized to an empty string.
 func (d DateTime) String() string {
-	if d.IsZero() {
+	t := d.Time()
+	if t.IsZero() {
 		return ""
 	}
-	return d.Time().UTC().Format(DefaultDateLayout)
+	return t.UTC().Format(DefaultDateLayout)
 }
 
 // MarshalJSON implements the [json.Marshaler] interface.
@@ -74,12 +75,10 @@ func (d DateTime) Value() (driver.Value, error) {
 // into the current DateTime instance.
 func (d *DateTime) Scan(value any) error {
 	switch v := value.(type) {
-	case DateTime:
-		d.t = v.Time()
 	case time.Time:
 		d.t = v
-	case int, int64, int32, uint, uint64, uint32:
-		d.t = cast.ToTime(v)
+	case DateTime:
+		d.t = v.Time()
 	case string:
 		if v == "" {
 			d.t = time.Time{}
@@ -91,6 +90,8 @@ func (d *DateTime) Scan(value any) error {
 			}
 			d.t = t
 		}
+	case int, int64, int32, uint, uint64, uint32:
+		d.t = cast.ToTime(v)
 	default:
 		str := cast.ToString(v)
 		if str == "" {