Looking for an Android calendar app that will sync with a Windows app like Rainlendar

I like to keep a calendar widget open on my Windows desktop since I have lots of room for it, but I usually enter events on my phone since it's always with me. Is there an app combo that will sync? I can probably self-host if need be.
(I suspect this would be easier if I were running Linux on my desktop...)

Edit:
I should have mentioned that I don't like the interface of the Google Calendar app on Android, and I'd prefer something third-party.