Age from birthdate

Client

Years and days between a birthdate and a reference day.

How to use

Enter birthDate|referenceDate (reference optional, defaults to today).

About Age from birthdate

Calculate age in years from a birthdate—local date math. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Age: 20 years (as of 2020-01-01)
Days since birth: 7305

Nearby workflows on Toolcore

  • Unix timestamp converter — Epoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser. when units or numeric output should be checked on a related calculator.
  • Cron expression helper — Human-readable schedule, next run times—standard 5-field cron in your browser. when units or numeric output should be checked on a related calculator.
  • Weekday name from date — Return English weekday for an ISO date. when units or numeric output should be checked on a related calculator.
  • Countdown timer — Set a target local date and time—see days, hours, and seconds remaining; updates in your browser. when units or numeric output should be checked on a related calculator.

Common use cases

  • Eligibility age checks.
  • Anniversary or milestone planning.

Common mistakes to avoid

  • Time zones

    Parsed as local calendar dates at midnight.

FAQ

Future birthdate?

Negative age is possible if reference is before birth.

More tools

Related utilities you can open in another tab—mostly client-side.