Time & DateGenerated accuracy model review: 2026-05-06

Time Card 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

1. Convert Start and End times to minutes from midnight. 2. Handle overnight shifts (if End < Start, add 24 hours). 3. Subtract the Break duration. 4. Convert the net minutes back to Hours:Minutes and Decimal Hours.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

Start Time: 09:00
End Time: 17:00
Break (Minutes): 30

Expected outputs

Total Hours (Decimal): 7.5
Hours & Minutes: 7h 30m

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

If the end time is earlier than the start time, the tool assumes the shift crossed midnight once.
Break time is treated as unpaid and is subtracted directly from the elapsed shift length.
The calculator handles one shift block at a time and does not total multiple days or multiple breaks.

Unit handling

Start Time accepts local time values.
End Time accepts local time values.
Break (Minutes) accepts numeric values.

Rounding rules

Number displays use up to 2 decimal places in the calculator UI.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current time-card-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Time Card Calculator.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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