The age calculator works with the day-month-year precision used in official procedures; enter the exact date, because how fractional age gets rounded can change outcomes for school enrollment or retirement. Know the difference between the date difference and business days tools: the first counts calendar days, the second excludes weekends and, optionally, public holidays. Contract deadlines and legal filings usually run on business days.

The time difference calculator and world clocks track more than 90 cities including daylight saving shifts, showing the real gap between two cities on the specific day you are planning a meeting. The day-of-birth tool tells you which weekday you were born on. The Roman numeral date converter translates dates both ways for inscriptions and film credits.

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