Time tools
8 free time tools · Dates, durations and zones
Count working days, compare cities, calculate an age or add up a timesheet. Check the date, timezone, weekend and holiday settings that apply to your task.
All time tools
- Days between dates Count days and optional business days between two dates.
- Age calculator Exact age in years, months and days, plus next birthday.
- Add days to date Add or subtract days, weeks, months or years.
- Time zone converter Compare a time across multiple zones at once.
- Date countdown Live countdown to any date and time.
- Duration calculator Time between two dates and times, every way.
- Week number ISO and US week numbers for any date.
- Timesheet calculator Add up worked hours with breaks and overnight shifts.
Guides
- Business days vs calendar days: how to count a deadline Count calendar and business days with examples. Check weekends, holidays and whether the start and end dates count before relying on a deadline.
- Adding months to a date: what happens at month end? See how date calculators handle 31 January plus one month. Compare clamping with overflow and learn why adding a month differs from adding 30 days.
- ISO week numbers: week 1, week 53 and year boundaries Learn how ISO week numbers work, why some dates belong to a different week-year and how Sunday-start conventions can give different results.
- Time zone conversion: dates, UTC offsets and daylight saving Learn why city time differences change during the year. Use named timezones and a specific date to account for daylight saving and unusual offsets.