Date Add / Subtract Calculator

Add or subtract days from any calendar date to find project deadlines and milestones.

Input Parameters

Start Date

Days to Add (or negative to subtract)

Target Calculated Date

Thursday, November 5, 2026

ISO: 2026-11-05

175 available

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Add or subtract days from any date to land deadlines, anniversaries and project milestones, with weekday and ISO output.

Negative days allowed?

Yes — enter a minus to go backwards, e.g. −30 for a month-ago review date.

Business days or calendar?

This tool counts calendar days; for workdays-only math use the workdays calculator.

Leap years handled?

Yes, automatically by real calendar arithmetic.