Date & time

Compare dates, count calendar or business days, and work with time zones. Results depend on the selected date and zone.

17 tools in this category.

• Date difference

  Count signed calendar days between two dates. Start is included and end is excluded.

• Add days

  Add or subtract a number of calendar days without local daylight-saving surprises.

• Working days

  Count days using your weekday schedule and optional excluded dates. This is not an official legal work calendar.

• Unix timestamp

  Convert epoch seconds/milliseconds to ISO UTC, or an ISO date/time with an explicit offset to an epoch.

• World clock

  Show a current-time snapshot in a selected IANA time zone. Accuracy depends on your device clock.

• Time zones

  Convert local time between IANA zones. Nonexistent daylight-saving times are rejected; repeated times require a choice.

• ISO week

  Find the ISO week year and week number. Weeks start on Monday.

• Countdown

  Show remaining seconds, hours and days to a zoned date/time; the result is a snapshot.

• Timer & stopwatch

  Start, pause and reset a timer or stopwatch. Uses elapsed time, not the number of browser ticks. Background alarms are not guaranteed.

• Sunrise and sunset

  Approximate geometric sunrise/sunset with standard atmospheric refraction. UTC results; local terrain and weather are not modelled. Polar day/night is handled.

• Moon phase estimate

  Approximate lunar phase from the mean synodic month. For an educational calendar, not eclipse or navigation prediction.

• Solar eclipse dates

  Global solar eclipse date catalogue for 2026–2030, attributed to NASA/GSFC. A date does not imply visibility from your location. Not an observation guide.

• Grocy stock

  Home stock accounting: lots, quantities, expiry dates, consume/purchase actions and urgent list.

• Wallos subscriptions

  Own subscription calendar with recurring charges, categories, reminders and monthly totals.

• Monica contacts

  Private own-contact journal: notes, interactions, reminders and search without hidden collection.

• LubeLogger vehicle log

  Own vehicle log: service records, costs, documents and reminders without repair instructions.

• HortusFox plants

  House plant catalog with watering/care schedule, notes and reminders without unsafe treatment advice.