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Legal & ComplianceGenerated accuracy model review: 2026-05-06
Refund Window 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
- Estimated Refund Deadline = start date plus or minus the entered day count, using the selected calendar-day or business-day method and optional weekend adjustment.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Purchase or Delivery Date: 2026-09-23
- Refund Window: 30 days
- Count Direction: After start date
- Counting Method: Calendar days
- Weekend Adjustment: No adjustment
- Holiday Calendar: opm_us_federal_2026
- Excluded Weekdays/Holidays: 0 days
Expected outputs
- Estimated Refund Deadline: 2026-10-23
- Calendar Days from Start: 30 days
- Business Days from Start: 21 days
- Method Used: calendar days, after, holiday calendar: opm_us_federal_2026, weekend rule: none
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- This calculator does not provide legal advice and does not create an attorney-client relationship.
- Jurisdiction, contract language, service method, holidays, emergency orders, and agency rules can change the real deadline.
- Inputs are processed locally in the browser and are not stored by Calwarden.
Unit handling
- Purchase or Delivery Date accepts calendar dates.
- Refund Window accepts values in days.
- Count Direction accepts one of the configured options.
- Counting Method accepts one of the configured options.
- Weekend Adjustment accepts one of the configured options.
- Holiday Calendar accepts one of the configured options.
- Excluded Weekdays/Holidays accepts values in days.
- Calendar Days from Start is displayed in days.
- Business Days from Start 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 refund-window-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Refund Window Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.