Calendar (El Capitan): Add calendar accounts
You can add multiple accounts to Calendar, including iCloud, Exchange, Google, Facebook, Yahoo!, and CalDAV. You can view, add, and modify events in all the accounts you add. When you add or modify events, or accept invitations on one device, all your other devices that use the same account are automatically updated.
All calendars associated with an account are in the calendar list on the left. If you don’t see the calendar list, choose View > Show Calendar List.
Add an account
Choose Calendar > Add Account, select the account type, then follow the onscreen instructions.
If you’re already signed in to iCloud on your Mac, you don’t need to add your iCloud account as described above. However,
Turn an account on or off
By default, your account is turned on when you add it. If you turn off an account, the account’s calendars no longer appear.
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Choose Calendar > Preferences, then click Accounts.
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Select an account, then select or deselect “Enable this account.”
Delete a calendar account
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Choose Calendar > Preferences, then click Accounts.
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Select the calendar account, then click the Remove button
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If you delete an iCloud calendar account, the Calendars feature is turned off in iCloud preferences (or in Internet Account preferences if your Mac has more than one iCloud account set up). If you turn on the Calendars feature again in iCloud preferences (or Internet Account preferences), your iCloud calendars and events reappear in Calendar, up to date.
When you set up the Calendar app to use a calendar account, you can view the same calendars on all your devices. When you create or edit events, or accept invitations on one device, all your other devices that use this account are automatically updated.