I have a grid with multiple types (set with renderer and getEditor). if the filed is a Date, the format of the displayed date changes after new date is selected from '2017-04-20' to smth like 'Wed Apr 20 2017 00:00:00 GMT (Eastern Daylight Time)'
and the value sent to server is '2017-04-20T00:00:00' on save.

I created the fiddle with sample code. I am not really familiar how to emulate saving to the server so I removed the code

handler: function() {
            var recs = grid.getStore().getModifiedRecords();
            if (recs && recs.length > 0) {
                success: function() {
                  Ext.MessageBox.alert('Success!', 'Outage Status Configuration has been updated.');

what am I missing? how do I preserve the date format?

Thank you!