Android Sharepoint App not matching web

Hi all,

I have set up 365 for the company and inside I have a shared calendar for all to use. Some of us use the app on different platforms. I am using Android and the calendar does not sync up with the web i.e times are all out by one day on the app, not able to add appointments via app. I can't seem to find any settings on the app to change this. 

Any help would be greatly appreciated.

Thanks.