Quick add event to Calendar using GData

gistfile1.js

// Set the feed URL
var EVENT_FEED_URL = 'http://www.google.com/calendar/feeds/default/private/full'; 

// Create a calendar object
var calendarService = new google.gdata.calendar.CalendarEventEntry(); 

// Create a new event handler
var quickEvent = new google.gdata.calendar.CalendarEventEntry();

// Create a new property handler and set it to true
var quickAdd = new google.gdata.calendar.QuickAddProperty();
quickAdd.setValue(true);

// Set a string from which quick event will be created
quickEvent.setContent(google.gdata.atom.Text.create('A meeting tomorrow at 18:00'));
  
// Attach the property to the event
quickEvent.setQuickAdd(quickAdd);

// Create the event
calendarService.insertEntry(EVENT_FEED_URL, quickEvent);