Return Window Calculator
Estimate a return deadline from purchase or delivery, an inclusive-day rule and an optional policy extension. Check how much time remains on a chosen date.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
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How to use this calculator
Enter purchase and delivery dates, choose the policy's starting event and number of calendar days, then set whether that event is day 1. Enter an extension only if it applies.
A supplied extended date can move the deadline later, never earlier. The result is date-only and does not infer seller cutoff times, item exceptions, return shipping or when the seller must receive the item.
A worked example
A 30-day return window starting on delivery November 4, 2026, with that date as day 1, ends December 3. Counting from the following date instead gives December 4.
Are retailer policies included automatically?
No. Enter the policy on your receipt or order. Seller rules can vary by item, seller, location and purchase date; the calculator does not maintain retailer presets.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily attendance, office, coverage and chore plans allow up to 366 dates; school cycles, course plans and milestones allow up to 731. Dependency and historical workday calculations scan at most 3,661 dates. Class-session searches allow 366 dates and 200 sessions. Time-zone tools use browser IANA rules and require a choice when local times repeat. Dates and policy rules are entered manually; no employer, retailer, school or local weather policy is inferred. Copy, CSV and printing include the calculation rules; calendar exports appear when the result contains dated events.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.