Google Calendar Data API
Using the Google Calendar Data API
Google Calendar
allows client applications to view and update calendar events in the
form of Google data API (”GData”) feeds. Your client application can
use the Google Calendar data API to create new events, edit or delete
existing events, and query for events that match particular criteria.
There
are many possible uses for the Calendar data API. For example, you can
create a web front end for your group’s calendar that uses Google
Calendar as a back end. Or you can generate a public calendar for
Google Calendar to display, based on your organization’s event
database. Or you can search relevant calendars to display a list of
upcoming events on those calendars.
Read more here