iCloud Calendar Sync Issue


I’m using eM Client with my iCloud calendar on Windows. 

When I create an event let’s say at 17:00 in iCloud, It automatically adds it to 18:00. The issue is not the same with Exchange calendar. It stays where I put it.

Recently laws in Turkey has been altered and we are not benefiting from summer time. So, we will stay GMT+3 (Or GMT+2 with Summer option always on) for the rest of our lives.

Could that be the issue ? How can I fix it ?