Calculator hub

Dates and Time Calculators

Check exact dates, birthdays and governing eligibility rules whenever a simple numerical scenario is not enough.

Decision paths

Connect the metrics before acting

Use the calculators in this hub together and confirm that their periods, units and assumptions are compatible.

5 tools

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Add a chosen number of years to a current age for a simple future-age planning scenario.

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Find the ISO week number and ISO week-year for an entered Gregorian calendar date.

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Calculate the whole calendar-day interval between two entered ISO-style dates.

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Count Monday-to-Friday working days, weekend days and calendar days in a stated Gregorian date interval.

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Find the final Gregorian date in a fixed-day recurring schedule from a start date, interval and occurrence count.