About World Time Grid

It started from a simple frustration: most world clocks tell you what time it is somewhere, but not whether it’s a reasonable time to call. The grid lines up a whole day for several places at once and shades the working hours, so the overlap is something you can see rather than work out.

Everything else on the site follows from that. The meeting planner does the overlap-finding for you. The converter pages answer the quick “what time is it there?” question for the routes people ask about most. The holiday calendar saves you from booking a call on someone’s national day off.

How the times are worked out

All conversions happen in your browser, using the IANA time zone database that ships with every modern operating system. That database is maintained by volunteers and updated whenever a government changes its clocks, which happens more often than you’d think. We never use fixed offsets like “UTC−5” to stand in for a city, because they’re wrong for half the year.

Privacy

There are no accounts. Saved city groups and your last-used cities are kept in your own browser’s storage and never sent to us. We use Google Analytics to count visits and see which features get used; it doesn’t receive meeting titles, city groups or anything you type.

Found a mistake?

Time zone rules change, and we’d rather hear about an error than have someone miss a meeting. If a conversion looks wrong, check the date you’ve picked first (daylight saving is the usual culprit), and if it still looks off, let us know.