Importing calendars from other applications
If you would like to import old calendar data e.g. from a Palm device or iCal, you can do this using ICS files. Just export your calendars as ICS files and import them into Google Calendar. E.g. to export your calendars with iCal just click “File”, “Export”, “Export”:
Then import this ICS file into Google Calendar under “Settings”, “Calendars”, “Import calendar”:
There you have to choose the file and a calendar to import the file into. It is probably a good idea to create an additional calendar for this purpose.