Show contacts’ birthdays in Calendar on Mac
When you add birthdays to contact cards, you can see the birthdays on the Birthdays calendar in the Calendar app—just make sure Calendar settings are set to show the Birthdays calendar.
Siri: When you add a birthday to someone’s contact card, you can say something like: “When is Jane’s birthday?” Learn how to use Siri.
Go to the Calendar app on your Mac.
Choose Calendar > Settings.
Click General, then select “Show Birthdays calendar.”
The Birthdays calendar is updated automatically when you add or remove birthdays in Contacts.