Date Calculator
by Anonymous
Enter a base date and interval to see D-days, business-day counts, and your exact age side by side on one page.
About this app
Date Calculator brings three everyday date tools together on one screen: a countdown to a target date, date arithmetic from a starting date, and exact age from a date of birth. Add or subtract days, weeks, months, years, or business days, with weekends excluded from business-day calculations. It also shows detailed results such as weeks and days, days lived, and the number of days until the next birthday.
Use cases
- People tracking a birthday, trip, deadline, or event
- Office workers calculating dates and business-day timelines
- Anyone checking a future or past date from a known starting date
- Users who want to calculate exact age and upcoming birthdays
Features
- D-day countdown showing remaining or elapsed days
- Date addition and subtraction using days, weeks, months, years, or business days
- Business-day calculations exclude Saturdays and Sundays but not public holidays
- Exact age display in years, months, and days
- Birthday details including days lived, next birthday countdown, and day milestones
- Month-end adjustment for dates such as January 31 plus one month