Date time

Calculate exact age in years, months, days, and seconds, with next birthday countdown, Western Zodiac, and Chinese Lunar Can Chi.

Calculate the exact time difference between two dates in years, months, days, hours, and exclude weekends for working days.

Interactive multi-city world clock and meeting scheduler. Synchronize local times across New York, London, Tokyo, Hanoi, Paris, Sydney with visual 24-hour slider and working hours overlap.

Calculate optimal bedtimes and wake times aligned with natural 90-minute REM sleep cycles to prevent grogginess and sleep inertia. Includes power nap guides and .ics export.

Coordinate international meetings across multiple cities and time zones with a synchronized 24-hour visual scrubber, work/sleep availability ribbons, overlap finder, and .ics calendar export.