Does it handle leap years correctly?

Yes. The calculators account for leap years and month lengths, so the day counts are exact.

Can it skip weekends and holidays?

The business-days tool skips weekends. Public holidays vary by country, so check those against your local calendar.

Is anything I enter stored?

No. The math runs in your browser; the dates are not uploaded.

Yes, free and account-free, supported by light advertising.

Date calculators

Work out ages, gaps between dates, business days and week numbers.

Open the tools 21 tools, all in your browser

Date math is fiddly to do in your head: your exact age, how many days until an event, how many working days are in a range, or which ISO week a date falls in. The tools here do each precisely, leap years and all.

You enter the dates and get the answer in the browser, with nothing submitted or stored.

Which tool for which job

Age calculator: Get your exact age in years, months and days from a birth date.
Date difference: Count the days, weeks or months between two dates.
Days until: See how long until a deadline or an event.
Business days: Count working days in a range, skipping weekends.
ISO week number: Find the week number for any date, for planning and reporting.

Questions about the date calculators

Does it handle leap years correctly?: Yes. The calculators account for leap years and month lengths, so the day counts are exact.
Can it skip weekends and holidays?: The business-days tool skips weekends. Public holidays vary by country, so check those against your local calendar.
Is anything I enter stored?: No. The math runs in your browser; the dates are not uploaded.
Free?: Yes, free and account-free, supported by light advertising.