Disclaimer

WhenMath performs date and time arithmetic: counting, converting, and reasoning about calendar and clock relationships using stated, disclosed conventions. It is a calculation tool, not an authority on any specific rule, contract, or law.

Business days and holidays are calendrical, not legal

A business-day count, a holiday exclusion, or a working-calendar result reflects the inputs and the holiday data selected for that calculation. It does not determine, and is not evidence of, whether any specific employer, contract, court, government agency, or other jurisdiction treats a given date as a working day, a filing deadline, or a compliance deadline. Where a real deadline has legal, contractual, or financial consequences, confirm it against the authoritative source that actually governs it (the contract itself, the relevant court's rules, or the applicable agency), not against this site.

Age and anniversary results are not a legal determination

An age, an anniversary, or a milestone-date calculation is temporal arithmetic. It is not a determination of legal age, eligibility, or any status that depends on a specific jurisdiction's own rules, which can vary by purpose (voting, drinking, contracting, retirement, and so on) even within the same country.

Work-hours results are not payroll advice

A timecard, overtime-threshold, or rounding-impact calculation applies the counting and rounding rule you selected or entered. It does not determine what any specific employer is legally required to pay, what a specific wage-and-hour law requires, or how a specific payroll system will actually calculate a paycheck. For a real pay dispute or payroll question, consult your employer's own records, a labor authority, or a qualified professional.

Holiday, time-zone, and daylight data

Holiday presets, IANA time-zone rules, and daylight/sun-position calculations rely on a bundled, dated data source rather than a live feed. A jurisdiction can change its observed holidays or daylight-saving rules on short notice; where a result depends on very recent or upcoming rule changes, verify against an authoritative local source before relying on it.

No medical, financial, or professional advice

Nothing on WhenMath constitutes medical, financial, tax, legal, or other professional advice, even where a calculation touches a topic (such as an age or a deadline) that overlaps one of those fields. Use WhenMath's results as a starting point for your own arithmetic, not as a substitute for advice from a qualified professional where one is warranted.