World Clock
Current time in multiple timezones, ticking live. Add cities, drag to reorder, and share the view via URL. Click Fullscreen to expand the clock to fill your screen — useful as a permanent display on a second monitor or office TV.
Using the world clock as a live display
If you work with people in different countries, a clock you can glance at is easier than mentally converting times every time you schedule a call or check whether a colleague is still online. Click the Fullscreen button at the bottom of the clock widget to expand it to fill your entire screen — the sidebar and browser chrome disappear, leaving only the clocks ticking live. It works well as a permanent fixture on a second monitor, a wall-mounted TV in an office, or any shared display where the team needs to see multiple timezones at a glance.
The layout adapts automatically to how many timezones you have added. A small set of cities spreads across the full width of the screen; add more and they wrap into rows, each card staying wide enough to read comfortably from across a desk. Press Esc or click Exit fullscreen to return. Your timezone list and order are saved automatically, so the display is ready as you configured it the next time you open the page.
Timezones and UTC offsets
Every timezone is defined as an offset from UTC (Coordinated Universal Time). UTC itself never changes for Daylight Saving, which is why servers and databases store timestamps in UTC and convert to local time only at the point of display.
For timezones that observe Daylight Saving Time, the offset changes twice a year. New York, for example, runs at UTC−5 in winter (EST) and UTC−4 in summer (EDT) — see the Timezone Abbreviations reference for what these short codes mean. The world clock always shows the live offset, so you can tell at a glance whether the clock has changed for that region.
Not all offset differences are whole hours. India uses UTC+5:30, Nepal UTC+5:45, and parts of Australia shift between UTC+10:30 and UTC+11 for DST — a 30-minute change rather than the usual 60.
Frequently asked questions
How do I add a timezone to the world clock?
Click 'Add time zone' at the bottom of the list. You can search by city name or IANA timezone name (e.g. 'Tokyo' or 'Asia/Tokyo'). The new zone is added instantly and the URL updates so you can share it.
Can I display the world clock fullscreen on a second monitor?
Yes. Click the 'Fullscreen' button at the bottom-right of the clock widget. The sidebar and page chrome disappear, leaving only the clocks filling the entire screen, updating every second. Press Escape or click 'Exit fullscreen' to return to the normal view. Your timezone list is saved automatically, so the display is exactly as you configured it the next time you open the page.
Does the world clock work as an office TV or wall display?
Yes — that is what the fullscreen mode is designed for. Open the page in a browser on any screen, click Fullscreen, and leave it running. The layout adapts to however many timezones you have added: a small set spreads across the full width, and a larger set wraps into rows so every clock stays readable from across the room.
Are my chosen timezones saved?
Yes. Your timezone list is saved in localStorage, so it persists between visits on the same browser. It is also encoded in the URL, so you can bookmark or share the exact view.
Can I share this world clock with someone?
Yes — just copy the URL from your browser. The ?tz= parameter encodes all your timezones. Anyone who opens the link sees the same set of zones with the current time.
What does the UTC offset badge show?
The badge (e.g. GMT-4 or GMT+5:30) shows the current UTC offset for that timezone at this exact moment. For timezones that observe Daylight Saving Time, the offset changes twice a year — the badge always reflects the live value.
Why does India show GMT+5:30 instead of a whole-hour offset?
India Standard Time (IST) uses a 30-minute offset from UTC, giving UTC+5:30. Several other timezones also use non-whole-hour offsets: Nepal is UTC+5:45, Iran is UTC+3:30, and Australia/Lord_Howe oscillates between UTC+10:30 and UTC+11.
What is the IANA timezone name?
IANA timezone names (like America/New_York or Europe/London) identify a timezone region unambiguously, including all its Daylight Saving rules. They are the standard used by operating systems, databases, and programming languages. Short abbreviations like EST or IST are ambiguous and should not be used in code.