Warranty Coverage Calendar
Compare component warranty dates from purchase or installation. Add separate extension periods to see expiry dates and gaps in the entered coverage timeline.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
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Choose your dates.
Select your counting rules and calculate.
Calculation details
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How to use this calculator
Enter purchase, installation and report dates. Add each component's starting event, month term and optional extension term/start. Leave extension start blank for a contiguous extension.
Base terms end immediately before their clamped month anniversary. Overlapping extensions do not create duplicate coverage; late extensions leave a visible gap. The comparison only checks whether the report falls inside entered date intervals.
A worked example
A 12-month parts term starting January 31, 2026 ends before January 31, 2027. If its extension starts February 10, January 31 through February 9 is a gap in the entered dates.
Does being inside the date range mean my repair is covered?
No. Eligibility, exclusions, claim submission and component definitions come from the warranty terms. This tool compares the dates you entered.
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.