Work out a date of birth from an age, or enter a birthday to find the day of the week you were born, the countdown to your next birthday, your star sign, birthstone and more.
| Birthday | Date | Day of the week |
|---|
Count back from the date the age refers to: subtract the years, then the months, then the days. For example, someone who is 25 years, 3 months and 10 days old on 19 October 2026 was born on 9 July 2001.
If you only know the age in whole years, there is a range of possible birthdays: a person who is 27 on 19 October 2026 was born between 20 October 1998 and 19 October 1999.
Enter your birthday in “Birthday facts”. The calculator uses the Gregorian calendar to find the weekday, then shows which day your next few birthdays fall on — handy for planning a party.
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