Anywhen
The timeless time calculator. Every calculation that revolves around time — durations, dates, time zones, business days, countdowns, timestamps — done properly, on a phone that never needs a connection.
Correctness is the point
Most time calculators quietly get the hard cases wrong. Anywhen is built on the IANA time-zone database, uses exact integer arithmetic with no floating-point date math, and is tested against thousands of property-based cases covering daylight-saving transitions, leap years, and the awkward zones with 30- and 45-minute offsets.
When a result depends on a convention — what “one month later” means from January 31st, or which instant to use when a clock jumps — Anywhen tells you which rule it applied instead of hiding it.
What it does
- Duration between two dates or times, daylight saving included
- Add or subtract days, weeks, months, years, hours, minutes
- Age — exact, next birthday, age on a given date
- Business days with custom workweeks and holiday calendars
- Time-zone conversion, historically accurate
- World clock for your favourite cities
- Meeting planner across up to eight people
- Timers that survive a reboot, and a stopwatch
- Countdowns, streaks, calendar facts, unit conversion
- Timestamp tools — epoch, ISO 8601, RFC 3339, RFC 2822
- Sunrise and sunset for any city, fully offline
Private by design
No account. No ads. No cross-app tracking. Your calculations, cities, events and timers stay on your device — there is no server we could put them on.
The app does send anonymous statistics about which tools get used, so we know what to improve. It never includes anything you type, it is disclosed the first time you open the app, and one switch in Settings turns it off. See the Anywhen privacy policy.
Home-screen widgets
Six widgets that earn their place: a world-clock strip, an event countdown, a days-since counter, a two-zone comparison, today’s calendar facts, and your next timer.
Anywhen is built by IscoviciLabs, the same studio behind Tiny Tools.