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Add / Subtract From a Date

Quickly calculate past or future dates by adding or subtracting time.

Time to Adjust

How to Add or Subtract Days from a Date?

Whether you are calculating project deadlines, planning a vacation, or determining contract expirations, tracking dates on a calendar can be confusing. Our Date Calculator handles the complex math—like varying month lengths and leap years—instantly.

  1. Select a Start Date: Use the calendar picker to choose your baseline date. It defaults to today's date for convenience.
  2. Choose your Action: Select whether you want to look forward in time (Add) or backward in time (Subtract).
  3. Enter the Time: Input any combination of Years, Months, Weeks, and Days. (For example, you can add 1 Year and 45 Days simultaneously).
  4. Calculate: Click the button to instantly view the exact target date and the specific day of the week it falls on.

Frequently Asked Questions (FAQ)

Does this calculator account for leap years?

Yes. Our date calculator utilizes native browser date-time logic, which perfectly accounts for leap years (adding a 29th day to February every four years) and varying month lengths (28, 30, or 31 days).

How do I calculate 90 days from today?

Simply leave the start date as today, ensure the action is set to "Add (+)", type "90" into the "Days" input box, and click calculate. The tool will instantly provide the exact date 90 days in the future.

What is the difference between adding weeks and adding days?

A week is strictly defined as 7 days. If you enter "3" in the weeks box, the calculator simply adds 21 days to your start date. The day of the week (e.g., Monday) will always remain the same when you add or subtract full weeks.