Taipei is 12 hours ahead of Philadelphia

There is no standard 8-to-6 overlap. Someone joins early or late.

Taipei is 12 hours ahead of Philadelphia, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Philadelphia dials in early while it's still late afternoon or evening in Taipei. These times hold for most of the year, but Philadelphia's daylight saving (which Taipei doesn't use) shifts them by an hour twice annually.