Online Clock 🌏

Device clocks can drift by a few seconds depending on settings or battery state. This clock checks against a time server several times when the page loads and corrects the offset, so what you see stays accurate even if your device clock is off.

Yes. It compensates for network delay, so it is a reliable reference for timed events. Keep in mind the booking site judges the opening moment by its own server clock, which can differ by a fraction of a second.

Browsers slow down timers in background tabs to save power. The moment you return to the tab, the clock re-syncs with the server automatically, so simply switching back restores the accurate time.

DST shifts the clock forward one hour during the brighter months. Start and end dates vary by country and city; here it is calculated automatically and cities currently on DST get a ☀ DST badge. Korea does not observe DST.

UTC is the international standard kept by atomic clocks, including leap seconds. GMT is based on solar observations at the Greenwich observatory. In everyday use they are treated as the same time.

Type a city or country name in the search box under the clock and pick it from the full time-zone list. You can also tap a city on the globe to add it.

Yes. Cities you add appear under your local clock with their time and time difference. Fullscreen compare shows up to four cities at once in large type.

Yes. It keeps ticking from the last correction inside your browser. Small drift can build up over a long offline stretch, so staying connected keeps it most accurate.