Best overlap: 4:00 PM to 6:00 PM in Hong Kong is 8:00 AM to 10:00 AM in Edinburgh.
The best time to meet is 4:00 PM to 6:00 PM in Hong Kong, which is 8:00 AM to 10:00 AM in Edinburgh. The shared window is only 2 hours — treat 4:00 PM in Hong Kong (8:00 AM in Edinburgh) as the one fixed point and plan everything else around it. Bear in mind Edinburgh shifts for daylight saving while Hong Kong stays fixed — recheck these hours after each clock change.
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -