Some questions can only be answered by counting days: how old is someone exactly, in years, months and days — or how many days remain until a deadline, wedding, exam or launch? The age calculator turns any birthdate into a precise age, while the D-Day calculator counts up or down between any two dates you choose.
Both calculators handle leap years and different month lengths correctly, and the result updates the moment you change a date. Nothing you enter is stored or sent to a server; the calculation happens instantly, right in your browser, with no rounding errors or manual counting on a calendar.