Find the exact number of days, weeks, months, and years between any two dates. Calculate business days, working days, or total calendar days. Useful for project deadlines, countdowns, anniversaries, and age in days.
This calculator counts the exact number of calendar days between two dates by comparing the day-by-day difference. Business day mode excludes Saturdays and Sundays (public holidays are not automatically excluded — check your local calendar).
| Use Case | What to Calculate | Example |
|---|---|---|
| Age in days | Birth date → Today | Born 1 Jan 1990 → ~12,900 days |
| Project duration | Start date → End date (business days) | 10-week project = 50 business days |
| Contract deadline | Signed date → Expiry date | 30-day notice period |
| Days until event | Today → Future date | Days until 1 Jan 2026 |
| Probation period | Start date + X months | 6-month = 180–184 days |