PlanetClocksAbout PlanetClocks
PlanetClocks is a free, independent website that helps people everywhere know the right time.
We built PlanetClocks to be the fastest and clearest way to check the time anywhere in the world, plan calls across time zones, and use everyday timing tools such as a stopwatch, timer and alarm clock. The site is designed for phones first, loads in a fraction of a second and works without an account.
How our clocks work
All times are computed in your browser using your device clock and the internationalization (Intl) features built into modern browsers, which include the IANA time zone database. Nothing is sent to our servers to calculate the time. Sunrise and sunset times are calculated with the NOAA solar position equations, using each city's coordinates; they assume a flat horizon and standard atmospheric refraction, so actual times can differ by a minute or two depending on terrain and weather.
Our data sources
Time zone rules come from the IANA Time Zone Database. City names, coordinates, population and elevation come from GeoNames, used under the Creative Commons Attribution 4.0 license. Country names follow the Unicode CLDR project.
Languages
PlanetClocks is available in English, Spanish and Portuguese, and more languages are on the way.
Contact
Found an error or have a suggestion? Please visit our contact page. We read every message.