World Clock
View live time across multiple time zones at once. Compare cities side-by-side, add or remove locations, and see day/night status. Free, runs in your browser, no signup.
How It Works
Using World Clock in 3 Steps
See Default Cities
The clock starts with Mumbai, London, New York, and Tokyo. Each card shows live local time, date, and timezone offset (UTC±).
Add Cities You Care About
Click 'Add city' and search by city, country, or IANA timezone. The list covers every major hub across continents.
Read Day vs. Night Instantly
Cards glow warm during local daytime and cool at night, so you can scan availability without doing math in your head.
Use Cases
Who Uses World Clock?
Distributed Teams
Coordinate stand-ups, releases, and retros across continents — see at a glance whether your colleague is awake before scheduling a call.
Remote Workers & Digital Nomads
Track home, client, and current-location timezones together. Plan calls around overlapping working hours without spreadsheet gymnastics.
Trading & Operations Desks
Watch market open/close times across major exchanges (Mumbai, London, New York, Tokyo, Hong Kong) on one screen.
FAQ
World Clock — Frequently Asked Questions
Everything you need to know before you start.
How accurate is the time shown?
It uses your device clock and the browser's IANA timezone database, so it's as accurate as your system clock. The display refreshes every second.
Can I add any city in the world?
You can add any city from the built-in list, which covers the most-used IANA timezones across all continents. Cities sharing the same zone (e.g., Mumbai and Delhi both use Asia/Kolkata) show identical times.
Why do some cities glow warm and others cool?
Cards switch between a warm (daytime) and cool (nighttime) gradient based on local hour at that timezone, so you can see at a glance whether it's a reasonable hour to call a colleague.
Does it handle daylight saving time?
Yes. Because we use the Intl API and IANA zones, DST transitions are handled automatically — no manual adjustment needed.