Date Add / Subtract Calculator
Add or subtract days, weeks, months, or years from any date.
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Base date
Amount
Unit
Operation
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Date arithmetic for deadlines and contracts
Last updated: March 30, 2026
A date add subtract calculator helps answer questions like "What date is 90 days from today?" or "What was the date 6 weeks ago?" This is common in legal notice periods, procurement terms, and payment schedules.
Adding days, weeks, months, and years is not always intuitive because months vary in length and leap years affect annual offsets. Reliable tools apply calendar-aware logic so results remain correct.
Fast date arithmetic helps teams reduce manual mistakes in contracts, operations planning, and reminder workflows.
Frequently asked questions
What date is 90 days from today?
Use this calculator with today as base date, amount 90, unit days, operation add.
Can I subtract months and years?
Yes. Choose months or years as the unit and subtract to go backward from the base date.
Is this useful for legal deadlines?
Yes. It helps with notice periods, payment terms, contract milestones, and filing windows.