Taipei is 12 hours ahead of Atlanta
There is no standard 8-to-6 overlap. Someone joins early or late.
Because Taipei is 12 hours ahead of Atlanta, the two offices are essentially never open at the same time. If a live call is essential, aim for the very start or very end of a workday in one city and accept it'll be off-hours for the other. Seasonal note: Atlanta uses daylight saving and Taipei doesn't, so double-check the times in your own months — they can move by an hour.