Date, Age & Duration Calculator

Age, date difference, add/subtract, days until, milestones, day of week, and weekday counts — no login.

When you need a quick span, age, deadline, or weekday count.

One hub for civil calendar math: inclusive/exclusive day counts, year/month/day spans, add or subtract days/weeks/months/years with month-end clamping, age with next birthday (Feb 29 → Feb 28 in non-leap years), days until or elapsed, milestones, localized day of week, and weekday/weekend counts with configurable weekends. Public holidays are never invented here — use the Holiday planner. Today uses your device’s local date.