gizmobench

World Clock

Live clocks for the cities you choose, ticking to the second from your own device's clock, with the hour difference from where you are under each one. Every time is read through the browser's own time zone database rather than a stored offset, so daylight saving is right for each city on the day shown, half-hour zones like India show their real minutes, and a tab left in the background is right the moment you come back. Search any city or zone name to add it, switch between 24 h and 12 h, hide the seconds, copy every time as text, or send the wall full screen for a room.

Reading your clock and your time zone.

Clock
Seconds

Cities are remembered in this browser. The clocks read your device's clock through the browser's own time zone database, so daylight saving is right for each city on the day shown and half-hour zones show their real minutes. The stage ticks from the real clock, not a counter, so a tab left in the background is right the moment you come back. Nothing leaves your browser.

Common questions

Does the world clock handle daylight saving time?
Yes, and without a table of dates to go stale. Nothing here stores a city as a fixed offset. Each second, the current moment is formatted into every city's time zone by the browser's own time zone database, the same tzdata your operating system uses for its clock, and the difference from you is measured from what comes back. So on the day a country changes its clocks the card changes with it, and the awkward weeks are right too: the UK leaves summer time on 25 October 2026 and the United States on 1 November, so for that week London reads +4 h from New York instead of the usual +5 h, and this page says +4 h.
Why does one city show +9:30 or +5:45 instead of a whole number of hours?
Because that is the real difference. India is UTC+5:30, Nepal is UTC+5:45, and the Chatham Islands are UTC+12:45, so from New York in September, Bengaluru is +9:30 and Kathmandu is +9:45. The difference under each card is computed in minutes and written as hours only when the minutes are zero, so a half-hour or quarter-hour zone is never rounded to a wrong whole hour. Adelaide and Darwin in Australia and Newfoundland in Canada are on half-hour offsets too.
My own time is wrong. Why?
The clock on this page is your device's clock, read through your browser. If the first card, the one marked you, shows the wrong time, your computer or phone clock is set wrong, or its time zone is set to a different place from the one you are in. Every other card is derived from that same reading, so they are all off by exactly the same amount. Fix the device clock or its time zone in your system settings and reload: this page cannot correct it, because it has no clock of its own and never contacts a time server.
The city I want is not in the list. How do I add it?
Type the name of a bigger city in the same time zone, or type the zone name itself, like Europe/Madrid or America/Argentina/Buenos_Aires, and pick it from the dropdown. The zone database names one city per zone, usually the largest when the zone was created, so there is no Asia/Bengaluru and no America/Boston; to cover that, about 170 extra city names are bundled and searchable, from Boston, Manchester and Munich to Bengaluru, Shenzhen and Cape Town, each mapped to the zone that governs its clock. Accents are optional in both directions, so dusseldorf finds Düsseldorf and sao paulo finds São Paulo. The card is labelled with the name you picked, so adding Munich shows Munich, not Berlin.
How do I put the world clock on a wall or a second screen?
Press Fullscreen and the wall of clocks fills the whole screen, with the faces enlarged to be read from across a room; the search and settings stay behind, so set the cities, the 24 h or 12 h clock and whether seconds show before you go full screen. Press Escape or the Exit full screen button in the corner to come back. Full screen needs a browser that allows it, which is every desktop browser and most tablets; on some phones the button does nothing, and the wall still works as a normal page.
Is the world clock accurate in a background tab?
Yes. The faces are not counted up from a timer, which browsers slow down in a hidden tab; they are read fresh from your device's clock each time the page draws a frame, so nothing is accumulated and nothing can drift. The display does stop moving while the tab is hidden, because the browser stops drawing it, and the first frame after you come back is already the right time. Switching back to the tab also re-reads the clock on the spot.
Does anything I choose leave my browser?
No. The cities on your wall, the 24 h or 12 h setting and the seconds setting are remembered in your own browser's local storage so the page is as you left it, and clearing your site data removes them. There is no account, no upload and no server call: the time zone data is the copy your browser already ships. Copy puts every city's time on your clipboard as tab-separated lines, city, time, date, difference and zone, which pastes into a spreadsheet as columns or into a message as a list.

Times come from your device's clock and the browser's own time zone database, so daylight saving is right for every city on the day shown. If your device clock is wrong, every clock here is wrong by the same amount.