The SetText event was not fired automatically in XDataWebDateset fields.

[wlandgraf (Wagner Landgraf)]

Looks like this was already discussed here:

Display of timestamp in grid

I retested OnGetText in Demo\Basics\DataSet with adding a handler: WebClientDataSet1.Fields[0].OnGetText := FieldGetText; procedure TForm1.FieldGetText(Sender: TField; var Text: string; DisplayText: Boolean); begin Text := '---'+ Sender.AsString+'---'; console.log(Text); end; and this works as expected. In RTL\DataUtils there are several functions for getting UTC offset and use that for conversion.