Those are the screenshots
This problem make me accidentally join meetings one hour early which actually start one hour later. I have tried to edit meetings but somehow those meetings reverted back or duplicated with different time frames. I ended up deleting all my meeting schedules
while trying to delete duplicated meetings which is more confusing.
https://blogs.technet.microsoft.com/dst2007/2016/09/19/time-zone-updates-for-turkey/ Office for Mac did not receive this update for the time-being.
See how Mac Calendar.app and Outlook Calendar handle same meeting differently.