The Date Calculator adds or subtracts days, weeks, months, and years from a given date. It is useful for deadlines, project plans, notice periods, subscription renewals, delivery estimates, school dates, travel planning, and any question phrased as “what date is X days from now?”
Enter a starting date, choose Add or Subtract, and fill in the units you need. Weeks are converted to seven-day calendar periods, while months and years are applied as calendar units so the result stays understandable around month ends and leap years.
Click Calculate date when your inputs are ready. You can use the quick examples for common periods, then copy the resulting date and weekday when you are ready to use it elsewhere.
How months are handled
If the target month does not have the starting day—for example, adding one month to January 31—the calculator uses the last valid day of the target month. This avoids invalid dates while keeping the calculation calendar-aware.
Calendar days are not business days
This page adds ordinary calendar units. If you need to exclude weekends or public holidays, use the Business Days Calculator instead.