I use Win7 on the PC, Linux Mint 17.3 on a laptop, and Android phone.
all with google's calendar, and all of them sync up.
on the phone, I have found the best results, seem to work with having Jorte Calendar running in the background. I do not like its' display.
I use UpTo as my Display calendar on the Android, and it don't seem to matter, where a new entry is made, they show up everywhere eventually. The key word is "eventually".... sometimes it is 1 minute, sometimes, 5 minutes, other times more than 30 minutes.
I finally gave up trying to force all of them to sync "right now"
* Calendar by Jorte Organizer - Android Apps on Google Play
* Calendar * UpTo - Calendar and Widget - Android Apps on Google Play
( I went thru a lot of Android calendars trying to find the "perfect match".... I don't know if there is such a thing )