I want to create link for calendar list item .ics file. 
Link for 'Add to my calendar'.

I have tried below URL but it's not working:

    <a href="http://<SITE_URL>/_vti_bin/owssvr.dll?CS=109&Cmd=Display&List={<LIST_GUID>}&CacheControl=1&ID=<ITEM_ID>&Using=event.ics"> Add to my calendar <a>


Please help me in this.