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Date and Age Calculator
The difference between dates in years, months and days, adding and subtracting, working days taking holidays into account, age and a countdown.
What the tool can do
- The difference between dates in calendar form (“2 years 3 months 5 days”) and as totals: days, weeks, hours, weekdays.
- Adding and subtracting years, months, weeks and days. January 31 plus a month gives the end of February, not March 3.
- Working days between dates and “what date is N working days from now”: your own list of holidays and a working-Saturday switch.
- Age with the nearest birthday and “nice dates”: when you will turn 10,000 days, 15,000 days and a billion seconds old.
- About a date: the day of the week, the day number in the year, the ISO week, the quarter, the Julian day and Unix time.
- A countdown to an event with seconds; the event is remembered in the browser.
The production calendar changes from year to year and from country to country, so you set the holidays yourself. Dates are calculated without reference to a time zone.