Age Calculator

"How old am I, exactly?" and "how many days until this deadline?" are two versions of the same underlying calculation — the calendar-accurate difference between two dates — and this tool handles both with the same engine, switching between an age-focused mode and a general date-difference mode.

The calculation itself is more subtle than it looks. Simply dividing total days by 365 gives a wrong or misleading answer, because it ignores leap years and the fact that calendar months have different lengths. This tool computes a genuine calendar-aware breakdown — the same way a person counts age by hand, walking forward in whole years, then whole months, then remaining days — so "24 years, 6 months, 13 days" means exactly what it says, verified against known edge cases including leap-year birthdays and month-length transitions (like a birth date of January 31st, which doesn't exist in every following month).

Beyond the headline years/months/days figure, every result also shows the total elapsed time in days, weeks, hours, and minutes — useful for anyone who needs the precise total rather than the calendar breakdown, like calculating exact eligibility windows or contract durations.

The business-days option answers a specific, common question the basic breakdown doesn't: how many working days actually fall between two dates, excluding weekends — useful for estimating a project timeline or a notice period specified in business days rather than calendar days. Everything computes instantly and locally using plain date arithmetic.