Subscribe to events from an external calendar that supports the iCalendar (iCal) format. To use this feature, go to Settings → Subscribe to a Calendar.
See also: iCalendar Export.
Finding your external calendar's iCal link:
Google Calendar
See the "Get your calendar (view only)" section in Google's guide.
See also our direct integration here: Google Calendar Integration.
Microsoft Outlook / Office 365
Under the settings in Outlook on the web, go to Calendar → Shared calendars. See Microsoft's guide to sharing your calendar.
See also our direct integration here: Office 365 Integration.
iCloud Calendar (Mac)
See the "Share a calendar publicly" section in Apple's guide.
iCloud Calendar (iOS)
See the "Share a read-only calendar with anyone" section in Apple's guide.
Basecamp
See Basecamp's guide to calendar subscriptions.
- On the "Pick a Calendar" page, you can get the ICS link from either Google Calendar or Apple Calendar.