Add to calandar link on web page

i need the code to create a add to? calendar? like this site.? [url removed, login to view]

we have a custom cms to add events to our website and not sure how to add this to your? calendar? function. If you click on the link see it offers the calander link for google, ical, outlook.... All i need from you is a webpage with the link and the js? that makes it work for my site.

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