This sounds bonkers. I have googled and tried many different things.
I live in the UK. When I have gone abroad and looked at Facebook the time zone updates. Great.
When I return it just will not go to GMT. Peoples events (cycling meets) are posted as 10am CET. Should be 9am GMT.
It should be an easy fix but I just cannot sort it. I went to try and post my own (dummy) event in GMT but it reverts to CET.
Any help appreciated. Thank you.