World Clock
See the current time in cities around the world at a glance, with each zone's offset and whether it is a working hour there.
How it works
Every clock reads from the same instant — your device's own clock — rendered into each city's zone. So the times are as accurate as your computer is; if your machine's clock is wrong, every row here is wrong by the same amount.
Offsets come from the browser's IANA database, so daylight saving is applied correctly for each city on today's date. The offset shown next to each city is what applies right now, not a fixed annual value.
Working-hours shading is a rough guide, not a rule — 09:00 to 18:00 local. It exists to answer the real question behind a world clock, which is usually whether it is a reasonable moment to call someone.
The formula
Each row
the same instant, rendered in that city's zone
Offset
hours and minutes ahead of or behind UTC, today
Day difference
a city can be on tomorrow's date already
Worked examples
| Scenario | Working | Result |
|---|---|---|
| Midday in London | UTC+0 in winter | 07:00 in New York, 17:30 in Mumbai |
| Tokyo against Los Angeles | 16 hours apart | Tokyo is usually a day ahead |
| A city on a half-hour offset | India at UTC+5:30 | Not aligned to the hour |
When you'd use it
- Checking whether it is a reasonable hour to call someone
- Coordinating a distributed team
- Watching a launch or market open in another country
- Keeping an eye on time back home while travelling
Common questions
How accurate is this clock?
Exactly as accurate as your own device's clock — it reads the time locally rather than fetching it from a server. If your machine's time is off, every city shown is off by the same amount.
Why is one city a day ahead?
Because offsets span more than 24 hours across the globe. When it is Monday evening in Los Angeles it is already Tuesday afternoon in Tokyo — the date rolls over at different moments, which is what the international date line marks.
Does it handle daylight saving?
Yes, per city, using your browser's IANA database. That is why the gap between two cities can change during the year — countries switch on different dates and some never switch.