World Clock
Watch the time in multiple time zones live, side by side.
Quick answer: World Clock: watch the time in multiple time zones live, side by side. Runs entirely in your browser, free, no signup.
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Good to know
A world clock is only as trustworthy as its handling of daylight saving time, and that is where hand-drawn timezone math falls apart. This tool uses the browser's Intl engine and the IANA timezone database — the same authoritative dataset servers rely on — so each city applies its own DST rules and historical offset changes automatically. That is why zones are named as Region/City (like Europe/Amsterdam) rather than as fixed offsets: a bare "UTC+1" cannot know when summer time begins.
The time itself comes from your device clock, so accuracy ultimately depends on your operating system's time sync. If a clock looks a minute off, the fix is in your OS settings, not here. Watching several zones side by side is the quickest way to sanity-check whether a colleague on another continent is awake before you message them.
When you need to actually convert a specific moment rather than watch the current time, the Timezone Converter is the right tool, and for coordinating a call across a team the Meeting Time finder flags which participants would be dragged outside working hours.
Frequently asked questions
- Is the world clock free?
- Yes — free with no signup.
- Which time zones are supported?
- Every IANA zone your browser knows about — about 600 in total.
- Does it handle daylight savings?
- Yes — Intl.DateTimeFormat applies DST rules automatically per zone.
- Is anything uploaded?
- No — the clock runs entirely in your browser.
- How accurate is the time?
- It's your device clock — as accurate as your OS time-sync settings allow.