There will always be outliers. If you're scheduling a meeting in a small town on the border of 2 countries that honor different time-zones, then you're probably

There will always be outliers. If you're scheduling a meeting in a small town on the border of 2 countries that honor different time-zones, then you're probably just going to have to pick one to be the source of truth, and hope it's the other side causing the disruption (changing their clocks) and they'll pay for the administrative overhead.