Everyday Life

Date Calculator: Add or Subtract Days, Weeks, Months or Years from a Date

Free tool · Updated October 3, 2026 · By CouponTalk

Your result

Enter your measurements to see your result.

Quick answer

Add or subtract days, weeks, months or years to find a date. Ninety days from 2 October 2026 is 31 December 2026, a Thursday. Months are added by calendar month, so one month after 31 January is the last day of February. Use it for return windows, warranty end dates, notice periods, EMI dates and visa or exam deadlines.

How to use this calculator

Enter the start date, or leave it blank for today.
Choose add or subtract.
Enter the number and unit.

Common date windows

Common date windows
Window	Common use
7–10 days	Return and replacement windows
30 days	Notice periods, bill due dates
45 days	Payment terms
90 days	Probation, warranty claims, visa validity
180 days	Long warranties, residency counts

Results are estimates to help you plan. Confirm the final price, tax and offer terms at checkout.

Frequently asked questions

Does day 1 start today?

Here, adding 1 day to today gives tomorrow. Some return policies count the delivery day as day 1; check the policy.

What is 6 months from 31 August?

The end of February (28 or 29 February), because months are added by calendar month.

Can I count working days only?

Use the working days calculator for that.

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