You can connect your personal calendar from Apple, Google, Microsoft and more using the iCal format. ICal is a widely adopted format and most calendar apps should support it.
You can create your personal link by following these steps
Find information how to connect your personal calendar app.
For Apple Calendar you can find instructions here.
For Google Calendar you can find instructions here. Please follow the steps under section "Get your calendar (view only)".
for Microsoft Calendar you can find instructions here. Please follow the steps under section "Subscribe to a calendar".
If you use another calendar app, look for an option to subscribe to iCal calendars.