Insert a DatePicker - google-apps-script

Question

I work around this script:
https://developers.google.com/apps-script/articles/helpdesk_tutorial?hl=it
In this code part.
var textApptDate = app.createTextBox();
// Text entered in the text box is passed in to apptDate
textApptDate.setName('apptDate');
var day = new Date();
day.setDate(day.getDate()+1);
textApptDate.setText(Utilities.formatDate(day, "PDT", "MM/dd/yyyy"));
grid.setWidget(0, 0, app.createLabel('Appointment Date:'));
grid.setWidget(0, 1, textApptDate);
I change the code for insert a DatePicker
var day = new Date();
day.setDate(day.getDate()+1);
var textApptDate = app.createDateBox().setName('apptDate').setValue(day);
var handler = app.createServerHandler('change');
handler.addCallbackElement(textApptDate).;
DataPicker work fine but the script don't work fine.
where is the error?
thank you for help me.
raffaele

Answer 1

In the original script the value of the date in the handler function ( var apptDate = e.parameter.apptDate;
) is a string. The manipulations that follow in the code convert that string into a date object.
When you replace the widget by a dateBox the value of var appDate in the handler is not a string anymore, it is already a date object. So the following string manipulations won't work.
You have 2 possibilities :
convert this date object to a string and keep the code as it is (but this is a bit silly in my opinion because it's a kind of 'undo/redo')
Take that difference into account and go directly to the hour setting using the date object as starting value (which will be much more efficient and 'elegant').