World clock

How do I find a meeting time across time zones?

Find your own working hours first, then scan which cities fall inside roughly 9 to 18 at the same moment. Two clocks more than about ten hours apart have no comfortable overlap at all, and the honest move then is to decide out loud who takes the bad slot rather than pretending 6am is fine for them. Rotating it between calls costs nothing and gets noticed.

On Pro you can skip the scanning and ask. The board answers questions about itself: the best windows for everyone, whether a particular date is a working day in each country, and how an upcoming clock change will move a meeting you already have in the calendar. Answers come back as the same instant written in every city’s own local time, which is the form you can paste straight into an invite.

Why does the time difference between two cities change?

Because a UTC offset is a schedule rather than a fact. London is +0 in January and +1 in July, New York shifts on a different weekend, and plenty of countries do not shift at all. For a few weeks each spring and autumn the gap between two cities is not what it was last month, which is exactly when recurring meetings quietly move by an hour and somebody misses one.

This board stores IANA zone names like Europe/London rather than offsets, and lets your browser’s own time zone database do the conversion. When a government changes its rules your browser updates and the board is correct without anything shipping here. The small label under each city shows that zone’s current offset, which is the number you want when proposing a time.

Is it the same day in both cities?

Often not, and it is the most common way a cross-zone invite goes wrong. Each card carries a sun or a moon and switches to a dark treatment at night, so a city that has already rolled past midnight into tomorrow is obvious at a glance rather than something you work out from the digits. When you propose a time, give the date in their terms as well as yours.

Can I add any city?

Any zone your browser knows, which is the full IANA list of several hundred, searchable by city or region. The free tier keeps four cities on the board at once, which covers most teams. Pro removes the cap and allows custom labels, so a row can read “Client, Berlin” rather than Europe/Berlin. The board is stored in your browser, so it is still there tomorrow, and no account is involved.