World Clock
Build a list of cities and watch their current times tick live, with UTC offsets and day differences against your local time.
New York
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London
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Istanbul
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Tokyo
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Times come from your device clock, converted locally — nothing is sent anywhere.
How it works
- Type a city name in the search field and pick a match to add it to your clock list.
- Read the live time, UTC offset, and day difference for every city — the clocks tick every second.
- Remove any row you no longer need, or reset the list to the default cities at any time.
Frequently asked questions
- Where does the world clock get its time from?
- It reads your device’s own clock and converts it to each city’s timezone using the IANA timezone database built into your browser. If your computer or phone clock is accurate — which it normally is, because operating systems sync over the network — every city time shown is accurate to the second.
- Does the clock handle daylight saving time correctly?
- Yes. Timezone conversion is done by the browser’s Intl API, which applies each region’s current DST rules automatically. When a city switches between summer and winter time, its displayed time and UTC offset update on their own, with no action needed from you.
- Is anything sent to a server when I use this page?
- No. The city list, the timezone math, and the ticking clocks all run locally in your browser, and no network requests are made. Note that the list is not stored anywhere either, so it resets to the default cities when you reload the page.
- What does the day difference next to each city mean?
- It tells you whether that city is currently on the same calendar date as you, or one day ahead or behind. This matters for scheduling: a call at 9 pm your time on Friday may land on Saturday morning for a colleague in Tokyo, and the +1 day marker makes that immediately visible.
- Why do some cities show offsets like UTC+05:30 instead of a whole hour?
- Not all timezones are whole hours from UTC. India uses UTC+05:30, Iran uses UTC+03:30, and Nepal even uses UTC+05:45. The clock displays the exact offset in hours and minutes for every city, so half-hour and quarter-hour zones are shown correctly.
About this tool
This world clock shows the live, ticking current time in any combination of major cities you choose. It starts with a practical default set — your local time plus New York, London, Istanbul, and Tokyo — and lets you search a list of more than forty major timezones to add the cities you actually care about. Each row shows the city name, the current time updated every second, the exact UTC offset, and whether that city is a calendar day ahead of or behind you.
Everything runs client-side. The page never asks a time server for anything; instead it takes your device’s clock and converts it with the browser’s built-in Intl.DateTimeFormat engine, which carries the full IANA timezone database. That means daylight saving transitions, half-hour offsets like India’s UTC+05:30, and historical rule changes are all handled by the same data your operating system trusts. Because no requests leave your device, the tool works offline once loaded and nothing about your usage is logged.
The most common use case is scheduling across offices and clients: keep the three or four cities your team spans in the list, and you can read at a glance whether 4 pm your time is still working hours in London or already past midnight in Tokyo. The day-difference marker is the detail people usually miss when planning calls across the Pacific — a meeting that is Thursday evening in San Francisco is Friday morning in Sydney, and the clock states that explicitly instead of leaving you to count hours.
A few practical tips: search by country name as well as city, since the list matches both — typing “India” finds New Delhi. If your city is not listed, add another city in the same timezone; the time will be identical. And if the displayed local time looks wrong, check your device clock and timezone setting, because the tool faithfully reflects whatever your system reports.