Age CalculatorYTScript

Chronological Age Calculator

Enter a date of birth and the assessment date to get chronological age as years, months, and days — including a Y;M;D copy format for reports.

Runs in your browser — dates never leave this device
Date of birth
Assessment date
Age will show up here Enter a date of birth. You can change the “age at” date if you want a day other than today.

How to use it

  1. 1

    Enter the date of birth.

  2. 2

    Enter the assessment date — the day the evaluation is done, which may not be today.

  3. 3

    Copy Y;M;D for a full report line, or Y;M if days should be dropped (months are not rounded up).

How this calculator counts age

Chronological age here is the same anniversary-day calendar age as the main calculator: whole years, then whole months, then leftover days.

Y;M;D is that result written with semicolons, for example 7;11;4. Y;M keeps the year and month and drops the days (7;11), so a child who is 7 years, 11 months, and 4 days is not written as 8;0.

This figure is not a developmental age, a language score, or an intelligence result, and this site is not connected with any test publisher.

Other date tools

Age calculatorExact age in years, months, and daysBaby age calculatorWeeks, calendar months, and days after birthDog age calculatorA size-based estimate in human yearsCat age calculatorAn estimate in human years from a public chartDays between datesCount days, with or without the end dateAdd or subtract daysMove a date by years, months, weeks, or daysDay of the week calculatorWeekday, day of year, and ISO week

Questions

What does Y;M;D mean?

It is years, months, and days in a compact form, separated by semicolons. The Copy Y;M;D button puts that text on your clipboard.

When should I copy Y;M instead?

When a form only wants year and month. We drop the days and do not round the month up.

Can I use a date other than today?

Yes. The assessment date is a required idea on this page — use the day the evaluation actually took place, even if that was last week or will be next month.

Is this the same as a published testing protocol?

No. It is ordinary calendar age. It should not be read as a substitute for a publisher’s official scoring software or forms.