How it works
Datefully performs every calculation locally in your browser. Select a calculation, enter dates by typing or using the arrow controls, and the answer updates immediately.
Available calculations
- Exact age: your age today in years, months and days.
- Age on a date: age at a chosen past or future date.
- Between dates: the calendar and total-day difference.
- Add or subtract: move a date by years, months and days.
- Next birthday: days remaining until the next birthday.
Dates are interpreted as calendar dates, not moments in a particular time zone. Results are provided as a practical guide.