Calculate ages, durations, time zones, countdowns, and life stats.
Calculate your exact age in years, months, weeks, days, hours, and minutes.
Calculate the exact days, weeks, months, or years between any two dates.
Calculate business days between two dates, excluding weekends and US federal holidays.
Find out what day of the week any date falls on — past, present, or future.
Add or subtract hours, minutes, and seconds. Calculate duration between two times.
Convert times between any two time zones instantly with DST status and business hours.
Live times for 60+ cities with DST badges and a built-in meeting planner.
Find how many days until any event, holiday, birthday, or deadline.
Visualize your entire life as a grid of weeks. See how much you have lived and what remains.
Enter your birthdate and watch your life stats unfold — heartbeats, breaths, and steps, ticking live.
Watch humanity grow in real time with live birth and death counters and regional breakdowns.
How many Mondays do you have left until retirement? Based on the 4,000 Weeks concept.
Create a live countdown timer to any date and time. Share countdowns for events and milestones.
How old are you on every planet? Enter your birthday for your age across the solar system.
Current moon phase, moonrise/set times, illumination, and full moon calendar. Pure astronomical math.
See which planets are visible tonight with rise and set times, brightness, and SVG diagrams.
Exact sunrise, sunset, golden hour, and solar noon for any location. No API — works offline.