Time Zone Overlap Finder

Frequently asked questions

What counts as a meeting overlap?

Any hour where both cities are inside typical business hours, 9:00 AM to 6:00 PM local time on each side. Those hours are highlighted in the grid.

How does the tool handle daylight saving time?

All offsets are computed live in your browser using its built-in time zone database, for today's date. When a city springs forward or falls back, the grid and the best window shift automatically. Nothing is hardcoded.

Why do some city pairs show no overlap?

When cities are 12 or more hours apart, the two 9-to-5 workdays never intersect. New York and Singapore, for example, are 12 to 13 hours apart. For those pairs the calculator says so plainly and suggests edge-of-day or async options.

What is the best meeting time inside the overlap?

The middle of the highlighted window. Both sides are past the morning rush and not yet winding down, and a one-hour daylight saving shift is least likely to push anyone out of hours.

Which cities are covered?

44 major business cities across the Americas, Europe, Africa, the Middle East, Asia, and Oceania. Six popular pairs also have dedicated guides with scheduling tips; pick any two cities above for the rest.

Guides

• New York to London Meeting Overlap: The Complete 2026 Guide
  The NY-London window is 9 AM to 12 PM New York / 2 PM to 5 PM London, except two weeks a year when daylight saving changes the math. The full guide with scheduling habits.
• Running Meetings Across US and European Time Zones: What Actually Works
  Core hours, meeting tiers, rotating the pain, and the async escape hatch: the system I actually use to run meetings across US and European time zones.