I have also a calendar problem, but even worse.
On my Galaxy I use 2 calendars:
a) the standaard that came with the phone
b) Smooth Calendar or Jorte or any other calendar app.
When I open a) I get the same times as I have on Google Calendar on my PC.
When I open b) they differ with 1 hour with Google.
On my PC appointment at 11:00
On phone a) same times.
On phone b) all times 1 hour earlier, i.e. 10:00
Have tried all kinds of things but nothing helps.
Anyone with a solution ???