World Clock
Check the current local time, date, and UTC offset in cities around the world.
Loading your cities.
What a world clock shows
A world clock shows the current local time in several cities at once. Each card is that city's time for the same moment, together with the date and the UTC offset in effect right now. It is not a countdown, and it is not a timer you start. If you only need this device's own time, the online clock is enough.
How to use the World Clock
- Search for a city, a country, or a time zone name such as America/New_York.
- Add the city. It joins the end of your list, and a city you already added stays marked as added.
- Read the clocks together. They all come from one current instant, so the gap between them is the gap between those places right now.
- Move a city up or down, or remove it. This browser remembers the list and the order.
How world time zones work
A time zone is a named region, not a permanent number of hours from UTC. Seoul uses Asia/Seoul. New York uses America/New_York. London uses Europe/London. AlarmPick stores that name with the city and asks the browser to format the current instant in that zone. The hours, minutes, date, and UTC offset you see are the result of that formatting.
Why a UTC offset can change
Daylight saving time, sometimes called summer time, moves local clocks forward or back on dates set by that region. The city's name stays the same, but the UTC offset changes. London can be UTC+0 in winter and UTC+1 in summer. New York can be UTC−5 in winter and UTC−4 in summer. Seoul does not observe daylight saving time, so Asia/Seoul stays UTC+9. AlarmPick does not keep its own calendar of those changes. The time zone data in your browser does, and the offset on each card is calculated for the current instant.
City time and a fixed UTC offset
Saving a city as a fixed offset would go stale. New York is not always UTC−5. The reliable record is the IANA time zone, America/New_York, and the offset is derived whenever the page shows the time. Two cities may share one zone. Los Angeles and San Francisco both use America/Los_Angeles, and you can keep them as separate clocks. Half-hour and quarter-hour zones are included, such as India at UTC+5:30 and Nepal at UTC+5:45.
Ways to use it
- See whether it is still the working day in another city before you call or send a message.
- Notice when a city is already on the next calendar date, or still on the previous one, compared with this device.
- Read the current UTC offset before you write a meeting time down. The offset belongs to this moment, not to a table stored with the city.
What this page does not do
- AlarmPick does not use your location or your IP address to choose cities. The clocks you see before you change the list depend on the language of this page.
- The time is the clock on this device, formatted in each city's zone. AlarmPick does not contact a time server, and it does not claim to be an official time signal.
- Your city list stays in this browser. There is no account, and the list is not sent to a server. Clearing site data removes it.
- You can keep up to 12 cities. Removing every city leaves the list empty until you add one again.
- This page does not convert a time you type from one zone into another. A particular date and time belongs on the time zone converter. It shows the current time in the cities you select.
Questions
What is a world clock?
A world clock shows the current local time in several cities at once. AlarmPick also shows the date, the day, and the UTC offset for that same moment.
How does AlarmPick calculate local time in each city?
It takes one current instant from this device and formats that instant in the city's IANA time zone. Every city on the page uses that same instant.
Does the World Clock account for daylight saving time?
Yes. Daylight saving follows the time zone data in your browser. AlarmPick does not keep a separate calendar of summer-time dates.
Why can a city's UTC offset change?
The offset changes when that region starts or ends daylight saving time. The city stays on the same named time zone, and the card shows the offset for the current instant.
Can I add multiple cities?
Yes. You can add up to 12 cities, change their order, and remove any of them. A city that is already on the list cannot be added twice.
Does AlarmPick use my location for World Clock?
No. AlarmPick does not read your location or your IP address. The starting clocks depend only on whether you opened the English or Korean page.
What happens to my saved cities when I return?
The list and its order are saved in this browser. They are not stored in an account. Clearing site data removes them, and an empty list stays empty.