Free Date & Age Calculators

What can you calculate?

Both tools answer everyday questions about calendars without any setup. Pick the one that matches your question and the answer appears as soon as you enter a date.

Date calculators

• Days between dates — the gap between two dates in days, weeks, and years, months and days.
• Business days — how many weekdays fall in a range, or the date a number of working days away.
• Days from or until a date — how long until a deadline or how long since something happened.
• Dates in the future or past — add or subtract days, weeks, months or years, with the day of the week.

Age calculators

• Exact age — years, months and days from a date of birth.
• Age on a specific date — how old someone was, or will be, on any date.
• Age in days, weeks and months — the same age expressed in smaller units.
• Age difference — the gap between two people's dates of birth.

How the calculators work

Each date is treated as a whole calendar day, without a time attached. Differences are counted day by day using the Gregorian calendar, so month lengths and leap years are always taken into account, and daylight-saving changes can't shift a result.

Ages and durations in years and months are counted in complete units, the way people usually say them. Where a figure can only be approximate — such as total months between two dates, or age in hours — it is labelled that way. Everything is calculated in your browser, and nothing you enter is stored.