Age CalculatorYTScript

What Day Was I Born?

Enter any date to see the weekday. The page also shows the day of the year and the ISO week number.

Runs in your browser — dates never leave this device
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 — a birthday, or any other civil date.

  2. 2

    Read the weekday first.

  3. 3

    Use the day-of-year and ISO week if you need them; they sit below the weekday.

How this calculator counts age

The weekday is the civil weekday of that Gregorian date. It does not depend on time zone or daylight saving, because only the calendar date is used.

ISO weeks start on Monday. Week 1 is the week that contains the first Thursday of the year, so early January can belong to the previous ISO year.

This page does not offer astrology or traditional calendar conversions.

Other date tools

Age calculatorExact age in years, months, and daysChronological age calculatorAge on an assessment date, with Y;M;D copyBaby 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 days

Questions

What day of the week was 14 August 1995?

A Monday. Type the date above to confirm.

What is an ISO week?

A week numbering system that starts on Monday. The first week of an ISO year is the one that includes 4 January (the week with the first Thursday).

Can I also see how old I am?

Yes — the main age calculator on this site uses the same date of birth and also reports the weekday you were born.