pikaday modification

hello,
i am trying to modify the pikaday settings for the date field.

I’m trying to set the pickWholeWeek to true. Below is what i have tried, but it doesnt work. Any idea what i’m doing wrong?

var customDatePickerStuff = Marionette.Object.extend( {
initialize: function() {
this.listenTo( Backbone.Radio.channel( ‘pikaday’ ), ‘init’, this.modifyDatepicker );
},

modifyDatepicker: function( dateObject, fieldModel ) {
dateObject.pikaday._o.pickWholeWeek = true;
}
});

jQuery( document ).ready( function() {
new customDatePickerStuff();
} );