World Clock
See the current time anywhere in the world. Add cities, compare time zones, and convert times instantly. Free, no signup, works for every timezone globally — with automatic daylight saving adjustments.
Time Zone Converter
What does this World Clock do?
This free online world clock shows the current local time in any city or timezone around the world. Whether you're coordinating with remote teammates, planning an international call, or just curious what time it is in Tokyo right now, this tool gives you an accurate, live-updating answer — instantly.
Unlike tools that rely on fixed offsets (which break twice a year when daylight saving time changes), this clock uses the IANA timezone database built into your browser. That means it automatically handles daylight saving time, historical timezone changes, and future rule updates. When a country changes its DST rules, your clock stays correct.
You can add as many cities as you want, search through thousands of locations, switch between 12-hour and 24-hour formats, and even convert a specific time from one timezone to another. Everything runs locally in your browser — no data is sent to a server.
How to use the World Clock
- See your local time at the top of the page. It updates every second and shows your current timezone and UTC offset. Use the 12h / 24h toggle right next to the time to switch between AM/PM and 24-hour formats.
- Add cities by typing a city name into the search bar. As you type, matching cities appear with their current local time. Click one to add it to your clock grid.
- Compare times side by side. Each clock card shows the city name, current time, date, UTC offset, and a day/night indicator.
- Convert times using the timezone converter below the clocks. Pick a source timezone, a target timezone, and a time — the converted result appears instantly.
- Remove a city by clicking the × on any clock card. Your saved cities are kept in your browser's local storage, so they're still there when you come back.
Why use this World Clock?
Every timezone covered
Supports all IANA timezones — every country, every major city, and every DST rule. Search from a database of hundreds of cities worldwide.
Live, second-by-second updates
Every clock ticks in real time. No manual refresh needed — the times update automatically every second.
Day / night indicator
Each clock shows whether it's daytime or nighttime in that city, so you know at a glance whether it's a reasonable hour to call.
Automatic DST handling
Daylight saving time is applied automatically based on the current rules for each timezone. No manual adjustments, no off-by-one-hour errors.
Remembers your cities
Your selected cities and format preference are saved in your browser. Close the tab and come back later — everything's still there.
100% private
Everything runs in your browser. No server, no logs, no tracking. Your data never leaves your device.
Fixed offsets vs. IANA timezones: why it matters
Most broken world clocks have the same root cause: someone stored a fixed number of hours. "New York is 5 hours behind London" is true for part of the year — but false for the rest, because the two places change their clocks on different dates. During those weeks, any clock using a fixed offset is confidently wrong.
This tool solves that problem by naming the place instead of the difference. Timezones have canonical IANA names like America/New_York or Asia/Tokyo, and those names carry all the rules with them — including historical changes, current offsets, and future DST transitions.
| Approach | Handles DST? | Survives rule changes? | Works for all cities? |
|---|---|---|---|
| Fixed offset (e.g. "UTC+5:30") | No — breaks twice a year | No — needs manual updates | Partially |
IANA timezone (e.g. Asia/Kolkata) | Yes — automatic | Yes — browser updates | Yes — every location |
| This world clock | Yes — automatic | Yes — browser updates | Yes — every location |
Common timezone abbreviations
Timezone abbreviations are convenient but often ambiguous — for example, "CST" can mean Central Standard Time (US), China Standard Time, or Cuba Standard Time. That's why this tool shows the full city name and the UTC offset alongside the abbreviation.
| Abbreviation | Full name | Typical offset | Example city |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC+0 | London (winter) |
| EST | Eastern Standard Time | UTC−5 | New York (winter) |
| EDT | Eastern Daylight Time | UTC−4 | New York (summer) |
| PST | Pacific Standard Time | UTC−8 | Los Angeles (winter) |
| CET | Central European Time | UTC+1 | Paris (winter) |
| CEST | Central European Summer Time | UTC+2 | Paris (summer) |
| IST | India Standard Time | UTC+5:30 | Mumbai, Delhi |
| JST | Japan Standard Time | UTC+9 | Tokyo |
| AEST | Australian Eastern Standard Time | UTC+10 | Sydney (winter) |
| AEDT | Australian Eastern Daylight Time | UTC+11 | Sydney (summer) |