Find a meeting time across time zones
Drag the slider under the wall and every city shows its own time at that moment. Press Find a time and the page lists the hours when nobody is asleep, with the best first.
Put the cities of everyone invited on the wall, set the work hours under Look (09:00 to 17:00 by default) and open Plan a meeting. The planner tests every quarter of an hour for the next three days against the meeting length you choose, from 30 minutes to 3 hours, and sorts what it finds into four tiers: everyone inside work hours; everyone awake, some of them early or late (from 07:00 to the start of work, or from the end of work to 22:00); nobody asleep, but someone on a weekend or up between 22:00 and 23:00; and, if nothing else exists, the least bad options. It shows the best tier it can find and says which one that is, with each city’s local time for every suggestion. Click a suggestion and the wall jumps to it.
An example. Take San Francisco, New York, London and Berlin on a winter weekday. They are UTC−8, −5, 0 and +1, so 08:00 in San Francisco is 11:00 in New York, 16:00 in London and 17:00 in Berlin. No hour is inside 09:00 to 17:00 for all four, because San Francisco’s morning starts when Berlin’s day is ending. The closest is 07:00 in San Francisco: 10:00 in New York, 15:00 in London and 16:00 in Berlin. Only San Francisco is outside work hours, and only just. The planner lists it as the closest option, and the Timeline layout shows why: the green band that marks everyone at work is simply missing.
Time travel
One slider moves every clock together. The amber frame and the word PLANNING make sure nobody mistakes it for the live time.
Best times
Suggestions ranked from everyone at work to least bad, for the meeting length you pick.
Hour by hour
A grid of each city’s day with the overlap outlined in green. Click any hour to show it on the wall.
Summary and link
Copy the time in every city for an invite, or a link to the exact moment.
Clock changes
A heads-up when daylight saving changes any city in the next 30 days, and how your gap moves.
Whole teams
Up to 12 clocks with names, so the card reads “Anna” with “Berlin” underneath.
Use it as a screensaver on a second monitor
Drag the tab to the spare monitor and press F, or click the wall. Your cities, colours and brightness are saved automatically, so it comes back the same tomorrow. While it is fullscreen the page asks the browser to keep the display awake, hides the mouse pointer after a moment and shows an exit button when you move the mouse. A web page cannot replace your operating system’s own screensaver, but a fullscreen tab on a second monitor does the same job, and this one is useful.
Kiosk mode for a TV, bar or office wall
Any device with a browser will do: a smart-TV browser, an old laptop, a Raspberry Pi or an HDMI stick. Set up the wall, open Screen & share and press Copy kiosk link. A kiosk link is your setup link with kiosk=1 added: it opens straight into a clean fullscreen with nothing else on the page, and the first click upgrades it to true fullscreen. Press K to leave kiosk mode. If someone leaves a planned time on the wall, a fullscreen wall goes back to the live time after ten minutes without a change.
To start it when the computer boots: on Windows, put a shortcut with the target chrome --kiosk "your-link" in the Startup folder (Win+R, then shell:startup). On macOS, add the browser to Login Items with the link as its home page. On a Raspberry Pi, add chromium-browser --kiosk "your-link" to the autostart file. Because the link carries the whole setup, the wall boots into your exact cities and settings after a power cut.
Keeping the screen on and protecting OLED
In fullscreen the page requests a screen wake lock, which Chrome, Edge and Safari honour. If your browser has none, switch off display sleep in the operating system for that monitor. The burn-in shift (on by default) drifts the whole picture a few pixels every minute so that no character stays on the same pixels, and the Brightness slider and Auto-dim darken the wall without touching the monitor’s own settings. For an OLED TV that runs for months, still let the panel run its built-in pixel refresh now and then.
Daylight saving and why the gap moves
The clocks use your browser’s IANA time-zone database, so daylight saving changes happen on the right date in every city without any setting. The surprise is that regions change on different dates, so the gap between two cities moves for a few weeks each spring and autumn. Between the last Sunday of October and the first Sunday of November, for example, Europe is already on winter time while the United States is not, and London is four hours ahead of New York instead of five. The Plan a meeting tab lists every change in the next 30 days for the cities on your wall and what it does to your gap.
| Region | Clocks go forward | Clocks go back |
|---|
| United States and Canada (most places) | Sun 8 Mar 2026, Sun 14 Mar 2027 | Sun 1 Nov 2026, Sun 7 Nov 2027 |
| European Union and United Kingdom | Sun 29 Mar 2026, Sun 28 Mar 2027 | Sun 25 Oct 2026, Sun 31 Oct 2027 |
| Australia (NSW, Victoria, SA, Tasmania, ACT) | Sun 4 Oct 2026, Sun 3 Oct 2027 | Sun 5 Apr 2026, Sun 4 Apr 2027 |
| New Zealand | Sun 27 Sep 2026, Sun 26 Sep 2027 | Sun 5 Apr 2026, Sun 4 Apr 2027 |
| No change | India, Japan, China, Singapore, Hong Kong, the Gulf states, Brazil, Mexico |
The wall reads your device’s clock, so keep it correct; it normally syncs itself over the network.
Real sunrise skies and the moon
Every card calculates the actual position of the sun for that city’s latitude and longitude. The sky brightens at the real sunrise, glows orange through the real sunset and fades into twilight and stars, and it follows the seasons. Cards show today’s sunrise and sunset, or midnight sun and polar night far north and south, and at night the moon is drawn in its current phase, mirrored in the southern hemisphere. The thin bar along the bottom of a card is that city’s 24 hours: warm for daylight, the accent colour for work hours and a white marker for now.
What working, evening, asleep and weekend mean
A quick “can I ping them?” signal. Working is inside the work hours you set, on a weekday there. Morning and evening are the hours just outside. Asleep is 23:00 to 07:00. Weekend follows the local weekend, including Friday and Saturday in Riyadh, Doha, Cairo, Tel Aviv, Kuwait City, Amman, Baghdad, Muscat, Algiers and Dhaka. Tehran is shown with a Friday weekend and Kathmandu with a Saturday one. Public holidays are not included, and a card with a brighter frame shares your own time.
Four layouts: grid, row, column and timeline
Auto grid chooses the arrangement that makes every clock as big as the screen allows. One row suits an ultra-wide monitor, one column a narrow one. Timeline draws one row per city on a shared 24-hour axis centred on the moment shown: the sky on top, who is available underneath, and a green band across every row wherever all cities are inside work hours. Where cards show the time as a clock face, the timeline always uses digital time.
Choose any city or time zone
Start from a preset (Remote team, Markets, Around the world, USA, Europe or Asia-Pacific), then change any slot from the list, add a city with the search box, reorder or remove clocks and add labels. The search finds around 170 cities by name or country, and any of the roughly 400 time zones your browser knows, such as Asia/Kathmandu or America/Indiana/Indianapolis. A zone that is not a listed city has no coordinates, so its sky uses an estimated position and may be off by an hour or two. Everything else, including the time and the date, is exact.
Keyboard and screen readers
The wall is drawn on a canvas, so the page also keeps a plain-text list of the times in every city for screen readers, updated every minute. The controls are ordinary buttons, sliders, checkboxes and a combobox with a listbox for the city search. Shortcuts: F fullscreen, ← → move the planned time by 15 minutes (with Shift an hour), PgUp PgDn a day, N back to now, P the planner, L the layout, A analog or digital, H 12 or 24 hours, S seconds, D skies, W work status, O sort west to east, + − more or fewer clocks, 1 to 7 presets and R reset.
Private, free and what is stored
Everything runs in your browser. No account, and no city, label or time is sent anywhere. The page, its fonts excepted, comes from this site, and visits are counted by SimpleAnalytics, which uses no cookies. Once loaded, the wall keeps time without a connection because it reads your device’s clock, and it redraws once a second to stay light on the processor and the battery.
In your browser it stores jb-clock-wall-v3 (your settings, cities and labels) and jb-theme (light or dark page). A planned time is never stored. A link carries its setup in the address, so anyone who opens it sees the same wall; reset clears the stored settings.
Limits to know about
It is a clock, not a calendar: it does not read your calendar or know public holidays, and a meeting suggestion only knows work hours and weekends. Work hours are the same for every city, in whole hours. The suggestions use the time-zone rules in your browser, so very recent changes to a country’s rules can be missing in an old browser. Weekends are simplified: Tehran’s Thursday and Kathmandu’s Friday half days are not shown.
More clocks and screens
For a single clock face see the analog clock screensaver; a countdown for a stage or a green room is the backstage stage clock; the gap between two dates is the days between dates calculator; and the golden hour calculator works out the light for a place.