About Offset Clock

Offset Clock is a free time zone converter built by Tariq. It started from a small, annoying problem: an app or game announces maintenance "at 9 AM PST", and working out what that means in your own time shouldn't take a search engine and five minutes of guessing.

What makes it different

Most converters only understand cities and countries. Offset Clock also understands time zone names such as PST, PDT, EST, GMT, CET and many more, so you can convert straight from the way an announcement is written. It tells you when an abbreviation is fixed all year (like PST) but the region is currently on a different time (like PDT), because that mix-up is a common source of mistakes.

How it works

All conversions run in your browser using the time zone database built into it. Nothing you type is sent to a server. You can pick any date, so daylight saving changes are handled for that date and not just for today.

Accuracy

Governments change time zone rules from time to time, and browsers update their data on their own schedule. For anything important, such as a flight, a legal deadline or a live event, double-check the time with the organiser. If you spot a wrong result, please tell us.

Get in touch

Questions, corrections and ideas are welcome on the contact page. The source code is public on GitHub.