Days Between Dates

It counts calendar-day boundaries crossed. Jan 1 to Jan 2 is 1 day (one boundary), not 2. If you want inclusive counting (treating both ends as full days), add 1 to the result.

Monday through Friday. Public holidays are not excluded automatically — different countries observe different holidays, so we leave that to your own calendar. The number represents pure weekday count.

Dates are interpreted as midnight in your local time zone. Calendar-day counts ignore DST shifts (since we count whole days). Hour counts may differ by ±1 around a DST transition because one day in a DST month is 23 or 25 hours.

Years and months have variable length, so the breakdown groups the duration into the most natural chunks: subtract whole years first, then whole months from the remainder, then days from what's left. Total days is the same duration expressed in a single unit.

Yes — set From to your birth date and To to today (or any reference date). The years/months/days view gives you age in the conventional human form. We also have a dedicated Age Calculator if you want a richer age-specific output (next birthday countdown, day of week born, etc.).

Yes. JavaScript Date supports a range of about ±271,820 years from 1970. For historical dates before the Gregorian calendar reform (1582), the result uses the proleptic Gregorian calendar (extending Gregorian rules backward), which differs slightly from the Julian calendar that was in actual use.