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 over 100 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 NOAA Solar Calculator algorithm. Timezone offsets and DST transitions are derived from the IANA Time Zone Database. Population figures are sourced from publicly available city statistics.