These tools provide informational calendar calculations. Verify legal, payroll, school and financial deadlines against the relevant rules. Public holidays are excluded only under the explicitly selected and successfully loaded holiday scope or custom exclusions. Release dates and local observances require an authoritative source. No account or subscription is required to use the calculators.
Age Calculator Lab
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Days Between Dates
Compare two dates with calendar days, complete weeks and weekday counts. Choose whether to include the end date.
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Business Days Calculator
Count working days using your weekend pattern and optional excluded dates. Public holidays are excluded only when entered.
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Day of the Week
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
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Time Zone Converter
Convert an exact UTC instant to another IANA time zone.
