Does the world clock handle daylight saving time?

Yes. It uses the browser's time-zone database, so each city's offset and daylight-saving changes are applied automatically. You name a zone like Europe/London rather than setting offsets by hand.

Can I choose which cities the world clock shows?

Yes. Edit the Cities field as a comma-separated list of City|TimeZone pairs, such as Tokyo|Asia/Tokyo. The cards lay out in a grid up to three across.

Is the world clock screensaver accurate?

Yes. It reads your device's clock once a second and converts that one moment into each city's local time. Every card is as accurate as your own computer's clock.

What do the sun and moon icons mean?

They show whether it is day or night in each city. The saver shows a sun when the local hour is between 6am and 6pm, and a moon otherwise.

Is the world clock screensaver free?

Yes. It runs entirely in your browser with no download or account. Press ESC at any time to exit full screen.

World Clock Screensaver

The World Clock screensaver shows the current local time in cities around the world at once, each on its own card. It reads your device's clock and converts it into each city's time zone, so every reading is accurate. It runs free in your browser with no download, and ESC exits.

How the World Clock screensaver works

Each city is one card listing its name, a big time readout and the local date. The saver reads new Date() once a second, then uses the browser's Intl.DateTimeFormat with each card's IANA time zone to convert that single moment into local time.

Because the conversion is done by the time-zone database, it handles daylight saving changes automatically - you do not set offsets, you name a zone like Europe/London or Asia/Tokyo.

A small sun or moon icon sits on each card. The saver checks the local hour in that zone and shows a sun between 6am and 6pm, otherwise a moon, so you can see at a glance who is awake.

The cities are read from a comma-separated Cities list of City|TimeZone pairs, and the cards lay out in a grid up to three across so several zones fit on screen together.

A worked example

With the default 24-hour format and seconds on, the board shows cards for San Francisco, New York, London, Paris, Tokyo and Sydney - so while London reads 18:20:11 with a sun, Sydney shows the next morning with its own date and a sun too.

Settings & tips

Edit the Cities field as City|TimeZone pairs, like Berlin|Europe/Berlin, to track exactly the zones you care about.
Switch Hour format to 12-hour for AM/PM cards, or turn off seconds for a calmer board.
Use the Accent control to set the color of the large time figures on every card.

Frequently asked questions

Does the world clock handle daylight saving time?: Yes. It uses the browser's time-zone database, so each city's offset and daylight-saving changes are applied automatically. You name a zone like Europe/London rather than setting offsets by hand.
Can I choose which cities the world clock shows?: Yes. Edit the Cities field as a comma-separated list of City|TimeZone pairs, such as Tokyo|Asia/Tokyo. The cards lay out in a grid up to three across.
Is the world clock screensaver accurate?: Yes. It reads your device's clock once a second and converts that one moment into each city's local time. Every card is as accurate as your own computer's clock.
What do the sun and moon icons mean?: They show whether it is day or night in each city. The saver shows a sun when the local hour is between 6am and 6pm, and a moon otherwise.
Is the world clock screensaver free?: Yes. It runs entirely in your browser with no download or account. Press ESC at any time to exit full screen.

← All Clocks & Timers screensavers