in the external calendar CO, one has to give a URI, but it doesn't work with the html code of a google calendar.
It works with the ICAL link of google calendar, but some (repeated) items are displayed twice in the personal calendar.
Updated by dominique de guchtenaere over 11 years ago
I used an ical link, and it works like a charm.
I tested it too with a html link: I didn't get a message (yet) it is the wrong format.
It's a bit confusing for a user:
Create - external calendar asks for a ical link
Import - ical asks for a file