Date arithmetic is processed in your browser. When a holiday source is selected, the requested country and calendar years are sent to the site and holiday provider. Complete input dates are not sent by that request. The selected time zone and any countdown deliberately saved on this device use browser storage. The hosting service may process access logs and authentication information. Google Fonts receives a request when the page loads. A copied countdown link contains its target in the URL fragment for the person receiving it. Countdown saves remain device-local. Clear browser storage to remove those preferences and saves.
Age Calculator Lab
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View the tool library▦
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.
