Practical guides to converting time zones, daylight saving, UTC and GMT, jet lag, and scheduling across countries. Each one is checked against primary sources and shows when it was last updated.
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For everyday purposes they're interchangeable. They differ in what they're measured against, and in which one you should actually write down.
Read Article: UTC vs GMT: What's the Difference?Hiring across time zones is the easy part. How to run a team spread across them without the same person always taking the 6 AM call.
Read Article: Running a Team Across Time ZonesA system of 24 equal slices would be simple. The one we have was shaped by borders, trade and politics — which is why offsets aren't always whole hours.
Read Article: Why Time Zones Are So ConfusingFinding a meeting time that works across time zones is mostly a matter of being explicit and checking your arithmetic. Here's what reliably works, and the mistakes that cause most of the trouble.
Read Article: Scheduling Across Time ZonesAbout 70 countries shift their clocks twice a year, on dates that don't line up. Where the practice came from, who still does it, and why the gap causes trouble.
Read Article: Daylight Saving Time, ExplainedEvery town once kept its own time, set by the sun. Railways made that unworkable, and within fifty years the world agreed on a standard — mostly.
Read Article: A Short History of Time ZonesYour body clock adjusts at roughly one time zone per day, and light is the main thing that moves it. Here's how to use that before, during and after the flight.
Read Article: Recovering From Jet LagThe arithmetic is addition and subtraction against UTC. What makes it go wrong is the date change, daylight saving, and the zones that aren't whole hours.
Read Article: How to Convert Between Time Zones