WorldClock.info is a free, ad-supported world clock tool that shows live local time, daylight duration, sunrise and sunset times, and seasonal information for 1042 cities across every timezone on Earth.
We believe time-zone information should be fast, accurate, and accessible to everyone — without sign-ups, paywalls, or unnecessary complexity. WorldClock.info is funded entirely by advertising; it will always be free to use.
Sunrise/sunset and daylight calculations use the solar-position equations NOAA publishes (Spencer, 1971). Timezone offsets and DST transitions are derived from the IANA Time Zone Database. Population figures are sourced from publicly available city statistics.