@Chadeus Replying to myself, but wanted this for the community.

It was about fixing the rrule-alt file and I changed it from 1970 to 1900 per the above link. Specifically: /home/pi/MagicMirror/node_modules/rrule-alt/lib/rrule.js

Change: ORDINAL_BASE: new Date(1900, 0, 1), /* changed from 1970 to 1900 */

Also, I generated a fresh private url for my Google Calendar. Not sure if that plays into it or not, but it worked after the changes plus getting a new url.

I have the same issue with Google Calendar private url. I have two calendars running, a private url and a public url. The private url is not working but the public url DOES work strangely enough. I have two pi’s, one updated and one not. The pi that has not been updated still has that private url and it works, but the post update does not.

Did you alter the rrule files and set them to 1900 to make them work? I reviewed my Google Calendar private url ics file and it looks like it doesn’t go before 1970. Now when I have MM2 running (2.1.1) it doesn’t give me the 1970 error but continues to show “loading”. Is there a fix for using private url? It works in the previous MM that I have installed on a separate Pi that I have yet to update.

I am having the same issue with Google Calendar. I’m using my private Google Calendar but can generate a “private” url to access it (.ics link) but it continues to display “loading…”. I have two pi’s, one that is updated and one that is not. The one that is not updated does work with the same private url link but the updated pi does not work. Again, I am using the same link in both with different results.