World Clock
Live clocks for any city or time zone, a day-and-night view of the whole world, daylight saving status, stock exchange hours, and a slider to see what time it will be everywhere later.
How to Use
- Your own zone is shown first. Type a city, an abbreviation such as IST, or an offset such as UTC+5:30 and press Add to add a clock; remove one with its ×. Your list is remembered on this device.
- Pick a ready-made set under Presets, such as US zones or the world’s stock exchanges, which show whether each market is open.
- Read the band above the clocks: it spreads every UTC offset from −12 to +14 and shades where it is day and night right now, with a line where the date changes.
- Drag Shift time to see what time it will be everywhere in a few hours, then press Live to return to now.
Worked Example
12:00 UTC on Monday 5 October 2026. Each clock is UTC plus its zone’s offset on that date: New York (EDT, UTC−4) 08:00; London (BST, UTC+1) 13:00; India (IST, UTC+5:30) 17:30; Tokyo (JST, UTC+9) 21:00; Sydney (AEDT, UTC+11) 23:00.
Further east the date rolls over: Auckland (NZDT, UTC+13) is at 01:00 on Tuesday 6 October. Honolulu (HST, UTC−10) and Kiritimati (UTC+14) both read 02:00, but Honolulu is on Monday and Kiritimati on Tuesday: they are 24 hours apart on the clock while lying only about 1,300 miles apart across the International Date Line.
The common mistake: adding a fixed offset all year. Sydney is UTC+10 in winter and UTC+11 from the first Sunday in October; New York is UTC−5 in winter and −4 in summer. Because the two hemispheres change in opposite directions, the gap between New York and Sydney swings between 14 and 16 hours over the year. These clocks take each zone’s offset for the actual moment.
Show Work
Formulas
Who Keeps the World’s Time Zones
Every computer, phone and browser takes its zone rules from the tz database, started in 1986 by Arthur David Olson at the US National Institutes of Health and maintained for decades by volunteers, most notably Paul Eggert. Since 2011 it has been published by IANA, the body that also runs the internet’s domain name root. It records each region’s offsets and daylight saving rules back to the 1970s and often much earlier, and is updated several times a year whenever a government changes its clocks, sometimes with only weeks of notice.
The span of 26 hours, from UTC−12 to UTC+14, exists because the date line bends around island nations. Samoa jumped from UTC−11 to UTC+13 at the end of 2011, skipping 30 December, to share a working week with Australia and New Zealand; Kiribati moved its eastern islands to UTC+14 in 1995 so that the whole country shares one date.
About This Tool
This world clock shows live clocks for any zone you add, found by city, abbreviation, IANA name or offset, with the date, offset, abbreviation and daylight saving status of each, and open or closed badges for the main stock exchanges. A band across the top shows where it is day and night across every offset, and a slider moves all the clocks forward or back to see a future or past moment.
Your list of clocks is kept only in this browser. Everything runs on your device; nothing is sent anywhere.
Related tools: Timezone Converter, Unix Timestamp Converter, and Countdown Timer.
Frequently Asked Questions
How many time zones are there?
About 37 different UTC offsets are in use at any one time, from UTC−12 to UTC+14, including half-hour and three-quarter-hour ones such as India (+5:30) and Nepal (+5:45). The IANA database that computers use lists more than 400 named zones, because places that share an offset today often had different rules in the past.
Can two places show the same time on different days?
Yes. Honolulu is UTC−10 and Kiritimati in Kiribati is UTC+14, 24 hours apart. At 12:00 UTC on 5 October 2026 both clocks read 02:00, but it is Monday in Honolulu and Tuesday in Kiritimati.
How accurate are these clocks?
They use your device’s clock, which is normally synchronised to an internet time server within a fraction of a second. If your device clock is wrong, every clock here is wrong by the same amount. The zone rules come from the IANA database built into your browser.
Do the stock exchange times include holidays?
No. The open and closed badges follow each exchange’s regular weekday sessions, including lunch breaks in Tokyo, Hong Kong and Shanghai, but not public holidays or half days. Check the exchange’s own calendar before trading around a holiday.
What does DST mean on a clock?
That zone is on daylight saving (summer) time, one hour ahead of its standard time. Only about a third of countries use it, and the northern and southern hemispheres use it in opposite halves of the year.
How do I use the World Clock?
Just type your numbers. The answer shows up right away — there is no button to press. Change anything and it updates by itself.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Distributed teams
Keep a clock for every office; at 12:00 UTC it is 8 AM in New York, 1 PM in London and 5:30 PM in India.
Markets
See which exchanges are trading: Tokyo pauses from 11:30 to 12:30 and closes at 15:30, London trades 08:00 to 16:30.
Calling family abroad
The day-and-night band shows at a glance whether it is a sensible hour to call.
Planning ahead
Drag Shift time by +6 h to see where everyone will be at the end of your working day.
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