Online Clock
Your local time
World clock
About this clock
This clock reads the time from your device and updates every second, so it is as accurate as your device clock. If you suspect your device is a few seconds off, make sure automatic time (internet time sync) is turned on in your system settings.
FAQ
How do I show the clock full screen?
Press the Full screen button. Press Esc to leave. It is handy as a desk or wall clock on a spare monitor or tablet.
Can I switch to 24-hour time?
Yes, use the 12 / 24 hour button. Your choice is remembered in this browser.
Are the world clock times adjusted for daylight saving?
Yes. They use your browser’s time zone database, which includes daylight saving rules.
What you see on the page
The large display shows your current time in hours, minutes and seconds. Under it is the full date with the weekday, and above the clock the page names the time zone your browser reports, for example "Asia/Seoul" or "America/Chicago". If that zone name is wrong, your device's region or time zone setting is wrong, and the clock will be wrong too.
- Read the time at the top. It refreshes four times a second, so the seconds change right on schedule without visible lag.
- Press 12 / 24 hour to toggle between the two formats. The choice applies to the main clock and to the world clock below it, and it is stored in your browser so it is still set next time you visit.
- Press Full screen to expand the clock to the whole display. Press Esc to return.
- Scroll down to the world clock to compare ten cities with your own time.
Where the time comes from
The page does not contact a time server. It asks your device for the current moment and formats it using your browser's language and region settings. That is why the display style, such as "03:45:12 PM" versus "15:45:12", can differ between visitors even before you press the format button, and why accuracy depends on your device. Phones and most computers synchronize with internet time automatically; if you disabled that, the clock can drift by several seconds or more over weeks.
To check your device, compare it with a trusted reference, such as your carrier's network time on a phone, and turn on automatic time if there is a difference. If you need a legal or scientific time source, use an official time service rather than any web page.
The world clock
The ten cities are New York, Los Angeles, London, Paris, Dubai, Mumbai, Singapore, Seoul, Tokyo and Sydney. Each shows hours and minutes only. The browser looks up each city's rules in its built-in time zone database, so summer time (daylight saving) is applied automatically on the right dates.
Some practical things this reveals:
- Mumbai is on a half-hour offset, so when it is 12:00 in Dubai it is 13:30 in Mumbai.
- Seoul and Tokyo are in the same offset and show the same time throughout the year.
- London and Paris differ by an hour, but New York and London do not always differ by the same amount: the United States and Europe change their clocks on different dates, so the gap shifts by an hour for a short period in spring and autumn.
- Sydney is in the southern hemisphere, so its summer time runs while the northern cities are on winter time, which moves its offset in the opposite direction from London's.
An example of using it: if it is 9:00 in the morning in Los Angeles, scan the list to see that colleagues in London and Singapore are at the end or well past the end of their working day. Pick a meeting time at which the rows you care about all fall in daytime.
Common uses
- A second screen clock. Full screen on a spare tablet or monitor gives a large clock for a desk, a classroom, a workshop or a presentation rehearsal.
- Timing to the second. Seconds are shown, which helps when you need to start something at a precise moment, such as a scheduled online sale or a call.
- Scheduling across countries. Quickly see whether a person on another continent is awake before you message or call them.
- Checking your own time zone. After travelling or changing a laptop's region, the zone label tells you what the browser believes.
Tips and limits
- Keep the tab open and in the foreground for the smoothest display. Browsers may slow down timers in background tabs, but the next refresh always shows the correct time because it is read from the device clock, not counted up.
- Full-screen mode only expands the clock area. If your device dims or locks the screen, change its sleep settings; a web page cannot prevent that.
- The world clock list is fixed. If you need a city that is not listed, find one in the same time zone, or add the zone's offset to your own time.
- The page shows clock time, not network-verified time. It cannot tell you whether your device is correct.
More questions
Why is the clock different from the one on my phone?
Both read your device, so they should agree to the second. If they do not, one of them is probably showing a different time zone, for example because the phone follows the mobile network while the computer has a manually set zone. Check the zone name shown above the clock.
Why does the format look different from what I expected?
The default style follows your browser's language and region. Use the 12 / 24 hour button to override the clock format; the date format will still follow your region.
Does the clock work without an internet connection?
Once the page has loaded, yes. It only needs your device's own clock and its time zone data, and it sends nothing to a server.