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Show the Birthdays calendar on iCloud.com
Calendar includes a special Birthdays calendar that can display all the birthdays you’ve saved in iCloud Contacts.
In Calendar on iCloud.com, click
in the bottom-left corner, then choose Preferences.
In the General pane, select “Show Birthdays calendar,” then click Save.
To hide the Birthdays calendar, deselect it in the sidebar. You can also see the Birthdays calendar on your iPhone, iPad, iPod touch, and Mac by selecting it in Calendar.
To modify a birth date, make the changes in iCloud Contacts; changes are reflected in iCloud Calendar within a day. See Edit a contact on iCloud.com.
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