The age calculator uses the day-month-year precision of official procedures. Enter the exact date, because the way a fractional age is rounded can change the outcome for school enrollment or retirement. The date difference and business days tools count different things: the first counts calendar days, the second leaves out weekends and, if you choose, public holidays. Contract deadlines and legal filings usually run on business days.

The time difference calculator and world clocks cover more than 90 cities, including daylight saving changes, and show the actual gap between two cities on the day you are planning a meeting. The day-of-birth tool finds the weekday you were born on. The Roman numeral date converter translates dates both ways, for example on inscriptions and in film credits.

Every tool here, including the stopwatch, runs in your browser and stores nothing. If you are working out an official deadline, confirm the institution's own counting method, including whether the filing day itself counts.