Disclaimer

Not professional advice

This site provides general-purpose date and time calculators. It is not a legal, payroll, employment, financial, tax, immigration or medical advisory service, and no result should be treated as professional advice or as a substitute for it.

If a date or duration determines a right, an obligation, a payment or an entitlement, take advice from somebody qualified to give it, and verify the figure against the official source that governs the matter.

Known limits of the data

Public holidays

• National holidays only. Regional, state, provincial, county and municipal holidays are not included. This is a substantial gap in federal countries: US states, German Länder, Canadian provinces, Australian states and Spanish autonomous communities all observe days the national calendar does not.
• No company or sector holidays. Shutdowns, industry-wide closures and contractual days off are not represented.
• One-off holidays are not included unless the calendar has been updated. Governments declare additional days for state occasions at short notice, and these will be missing until reviewed.
• Substitute-day rules are simplified. The common rule for each country is applied, but some holidays follow their own conventions, and practice does not always match statute.
• Calendar last reviewed: 30 July 2026.

Time zones

• Rules come from the IANA database in your browser. Results for future dates assume current rules continue, and governments change daylight-saving rules at short notice — sometimes with only weeks' warning.
• Historic coverage is incomplete before the twentieth century, and unreliable before national standard time was adopted.
• Leap seconds are ignored throughout, as they are in Unix time.

Calendar

• The proleptic Gregorian calendar is used for all dates, including those before its adoption. Britain and its colonies adopted it in 1752, and other countries at other times, so historic dates may not match contemporary records.
• Only ISO 8601 week numbering is supported, not Sunday-start conventions.
• A 29 February birthday is treated as falling on 28 February in non-leap years. Some jurisdictions use 1 March for legal purposes.

Hours and pay

• Pay figures are gross, before tax, national insurance, pension contributions and any other deduction.
• No account is taken of shift premiums, unsocial hours allowances, holiday pay accrual, statutory minimum wage rules or salary sacrifice arrangements.
• Overtime is applied against a weekly total. Contracts using daily thresholds, banded rates or annualised hours will give different answers.

Where results are most likely to differ from another source

When a result here disagrees with another calculator or with an official figure, the cause is almost always one of these three:

1. Endpoint counting. Whether the first day, the last day, both or neither are counted. Monday to Friday is four days or five depending on the answer.
2. The holiday calendar applied. A different country, a different region, or a different treatment of substitute days.
3. The definition of a month. Whether "one month" means the same date next month with clamping, exactly 30 days, or something set out in a contract.

Each calculator states which convention it used. If yours differs, that is the first place to look.

Reporting an error

If you believe a result is wrong, please report it with the inputs you used and the result you expected. Accuracy is the only thing this site has to offer, and corrections are acted on.