Days is a companion to Age Calculator Lab. It brings date intervals, calendar rules and everyday countdowns into one place. The calculators run in the browser. The next-occurrence pages use reusable date rules rather than a frozen annual list.
Age Calculator Lab
About the Days Lab
Keep exploring
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.
