How the difference is calculated
This date calculator first determines which date is earlier. It then counts full years, then full months, then remaining days using the actual days in each month — the same calendar method used by the main age calculator to calculate age. This avoids errors that come from assuming every month has 30 days or every year has 365 days, so you get a precise age difference calculator result for any span.
Calendar vs. elapsed
Calendar difference shows “1 year, 2 months, 5 days.” Elapsed values convert that span into total days and time (days × 24 = hours). Both are useful: calendar for human reading, elapsed for precise counting. See how age is calculated for the exact rules, or use the birthday calculator to see your next birthday countdown.