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Date add and subtract

Find a deadline relative to a date. Simple, private, right in your browser.

Pick up where you left offMy workspace →

Save the inputs and settings you choose. Nothing is uploaded until you select Save.

Save a file to your 5 MB cloud space

Choose a file explicitly. Your tool’s open files are never uploaded automatically. PDF, PNG, JPEG, WebP, TXT, CSV and JSON are supported.

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A LITTLE GUIDANCE

How to use this tool

  1. Choose a start date.
  2. Enter a positive or negative amount and its date unit.
  3. Calculate the resulting calendar date.

A worked example

2025-01-31 plus one month → 2025-02-28 under the displayed clamp-to-month-end rule.

What to know

Month and year arithmetic clamps to the destination month’s last day when necessary. January 31 plus one month becomes February 28 in a non-leap year. Daylight-saving changes do not affect date-only arithmetic.

Supported inputs and limits

Input and output dates from 1900 through 2100; whole amounts up to ±100,000.

Where is my data processed?

In your browser. Cloud saving is optional: only the supported inputs, settings or files you explicitly choose are uploaded. Download or save anything you want to keep before closing the page. Read our privacy details.

Further reading

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