What we build
Age & Date Calculator is a collection of free, fast date tools: an exact age calculator, days between dates, date plus/minus days, a business days counter with US federal holidays, a live countdown timer, a chronological age calculator for assessments, and born-in-year pages covering every birth year from 1935 to 2026.
How the math works
Every tool uses true calendar arithmetic — real month lengths, leap-year Februaries, observed holiday dates — never a divide-by-365.25 shortcut. The same date-math library powers all pages and is covered by automated tests for the classic edge cases: February 29 birthdays, month-boundary borrows, and holiday-week business-day counts.
Privacy by architecture
Everything runs in your browser. There are no accounts, no databases, and no forms that submit anywhere: the dates you type never leave your device. See the privacy policy for details on advertising cookies, the one exception any ad-supported site carries.
Accuracy notes
Holiday data covers US federal holidays 2025–2028 using observed dates. Zodiac ranges, generation labels, and day-of-week folklore are cultural conventions, provided for reference and fun. If you spot an error, we want to know — reach the operator via the domain's registrar contact.