📅 Date & Age Calculator

The date maths people actually need: how long between two dates (in days, weeks, and years-months-days), what day is N days from now, an exact age, working days between deadlines and days until your next birthday. All on the Gregorian calendar, counted in UTC so daylight saving cannot steal an hour and round a day off the answer.

Between two dates

Add or subtract days

Exact age & next birthday

Notes on the answers

Working days counts Mon–Fri between the dates (start excluded, end included) but knows nothing about your country’s public holidays — treat it as an upper bound; for the festive picture see the holiday calendars linked from the world clock. The years-months-days breakdown is the calendar answer a human would give (“26 years, 3 months, 11 days”), which is why it can differ from total-days ÷ 365.25. Born on 29 February? In non-leap years the page counts your birthday as 1 March and says so.

Part of Everyday Tools. Times across zones: world clock; how long the daylight lasts: sunrise calculator.