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Date & Time Calculators

Add or Subtract Days Calculator

Find the date a number of days, weeks, months or years before or after a given date.

Enter values

Results update as you type.

Result

Resulting date

Thursday, October 22, 2026

ISO format
2026-10-22
Day of the week
Thursday
Days from the start
30
Week number
43
Day of the year
295

About the Add or Subtract Days Calculator

Find the date a number of days, weeks, months or years before or after a given date.

Also known as: date plus days, add days to date, subtract days from date, future date calculator, date after 90 days.

How to use this calculator

  1. Enter starting date, direction, days, weeks and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

result = start date ± the period given

Worked example

Using the values pre-filled in the calculator above:

  • Starting date: 2026-09-22
  • Direction: Add
  • Days = 30
  • Weeks = 0
  • Months = 0
  • Years = 0
  • Count working days only (skips weekends): no

the calculator returns:

  • Resulting date: Thursday, October 22, 2026
  • ISO format: 2026-10-22
  • Day of the week: Thursday
  • Days from the start: 30