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Immigration, Visa & Travel DocumentsGenerated accuracy model review: 2026-05-06
Passport Renewal Date Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Suggested renewal date = passport expiration date - renewal buffer months - extra processing buffer days.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Passport Expiration Date: 2026-09-23
- Renewal Buffer: 6 months
- Extra Processing Buffer: 0 days
- Reference Date: 2026-09-23
Expected outputs
- Suggested Renewal Date: 2026-03-23
- Days Until Suggested Date: -184 days
- Days Until Expiration: 0 days
Known limitations
- This calculator does not check official passport validity rules, destination entry rules, processing times, appointment availability, name changes, lost passports, or emergency travel procedures.
Assumptions
- This is a planning estimate only, not legal advice, not an official government eligibility decision, and not an official deadline determination.
- All buffers are user-entered planning assumptions.
- The calculator does not include live processing times or country-specific travel rules.
- Dates and thresholds are processed locally in your browser and are not stored by Calwarden.
Unit handling
- Passport Expiration Date accepts calendar dates.
- Renewal Buffer accepts values in months.
- Extra Processing Buffer accepts values in days.
- Reference Date accepts calendar dates.
- Days Until Suggested Date is displayed in days.
- Days Until Expiration is displayed in days.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current passport-renewal-date-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Passport Renewal Date Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.