Use this address in your calendar app as a subscribed calendar (iCalendar / .ics feed). Most apps call it “Subscribe” or “From URL”—paste the same link Google or Apple asks for.
Copy link
Google Calendar
Open Google Calendar in a browser.
Next to Other calendars , open the plus (+) menu and choose From URL .
Paste the link above and add the calendar. Updates sync automatically on a schedule.
Apple Calendar
Mac: In Calendar, choose File → New Calendar Subscription… , paste the link, then click Subscribe .
iPhone / iPad: Open Settings → Calendar → Accounts → Add Account → Other → Add Subscribed Calendar , then paste the link.
Note: Calendar subscriptions are typically read-only and may take some time to refresh depending on the calendar app (Usually every 8-12 hours).