Best overlap: 8:00 AM to 2:00 PM in Edinburgh is 12:00 PM to 6:00 PM in Abu Dhabi.
For the smoothest call, aim inside 8:00 AM to 2:00 PM in Edinburgh, i.e. 12:00 PM to 6:00 PM in Abu Dhabi. Abu Dhabi is 4 hours ahead of Edinburgh, but with 6 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours. Daylight saving complicates things slightly: Edinburgh observes it, Abu Dhabi doesn't, so the difference flexes by an hour part of the year.
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. -