World Clock
The current local time in 64 major cities — updated live, with each city's offset from your time.
How to use this world clock
Every card shows a city's live local time, today's date and how far ahead or behind it is from your own time zone. Use the region buttons or the search box to narrow the list, and click any city to open its full time page with a sunrise, sunset and daylight breakdown. Planning a call? Try the time zone converter for an exact overlap, or browse all time zones, time by country and continents.
UTC — the reference every zone hangs from
Coordinated Universal Time (UTC) is the worldwide time standard kept by atomic clocks. Each city you see above is really “UTC plus (or minus) its offset”: London sits at UTC+0 in winter, New York at UTC−5, Tokyo at UTC+9. When you compare two cities, you are comparing their offsets — the live difference shown on each card is simply one offset minus the other. The advantage of a world clock over a list of raw offsets is that it does that subtraction for you, every second, and re-does it automatically when daylight saving flips a city forward or back.
Reading the world clock for planning
A few habits make cross-time-zone planning much easier:
- Think in local wakefulness, not raw hours. A city 9 hours ahead is unreachable after your lunch; 9 hours behind is fine. The question is always “is everyone between roughly 8 AM and 10 PM their time?”
- Anchor on the business day. For work calls, aim for a window where both cities are inside 9 AM–5 PM. US East Coast and Europe share a genuine business-hours overlap; US and East Asia share almost none, so pick early morning US / evening Asia.
- Remember the date line. Cities more than ~12 hours from you are often on a different calendar day — Sydney is already “tomorrow” during New York's afternoon. Our cards show each city's date for exactly this reason.
- Re-check around DST switches. In March and late October the offset between a European and a US city temporarily shifts by an hour. The live difference on this page always reflects the current rules, but a recurring calendar invite might not.
To see a whole week for several cities side by side, use the meeting planner — it shades working hours for each city so the fair slots stand out immediately.
Frequently asked questions
What is a world clock?
A world clock displays the current local time in multiple cities at the same time. This one updates every second and highlights the difference between each city and your own clock.
How many time zones are there?
There are 24 standard time zones in theory, but around 38 different UTC offsets are in use because some countries use half-hour or 45-minute offsets. See the full list on the time zones page.
Does the world clock handle daylight saving time?
Yes. Each city is rendered using its IANA time zone, so daylight saving changes are applied automatically — the offset shown for a city will shift when that region changes its clocks.
Why does one country have several times?
Large countries span many degrees of longitude, so they split into several zones: the contiguous United States uses four (Eastern, Central, Mountain, Pacific), Russia eleven, and China deliberately uses just one (UTC+8) even though it geographically spans five. Our country pages list every zone a country uses.
Why is one city a whole calendar day ahead of another?
The International Date Line sits roughly along the 180° meridian in the Pacific. Crossing it changes the date, not just the hour — so while it is Thursday afternoon in New York, it is already Friday evening in Sydney. The date under each clock above keeps this visible.