Random Birthday Generator
Random dates of birth with age range, format, age and zodiac sign.
Random Birthday Generator
The random birthday generator creates dates of birth for people within any age range. Choose the minimum and maximum age, pick a date format and optionally show each person's current age and zodiac sign. It is useful for software testing, sample data, fictional characters, classroom maths and party games.
Options
| Option | What it does |
|---|---|
| Min age / Max age | Only birthdays of people this old today are generated |
| Format | ISO (1990-03-05), US (03/05/1990), European (05/03/1990) or long (March 5, 1990) |
| Sort | Keep random order or sort from oldest to youngest and vice versa |
| Show age | Adds the current age, e.g. (age 34) |
| Show zodiac sign | Adds the western zodiac sign, e.g. (Pisces) |
For developers and testers
Birthdays are a classic source of bugs: off-by-one errors on the day of a birthday, leap-year dates, time-zone shifts that move a date by one day and age checks at exactly 18 or 21. Generate a few hundred dates with Min age and Max age around your boundary and run them through your validation logic. The ISO format (YYYY-MM-DD) is the safest for databases and APIs.
For writers and game masters
Give characters a birthday and a star sign to hint at personality or plan in-story celebrations. The Horoscope preset shows the full date with the sign.
The birthday paradox
Here is a fun classroom experiment: generate 23 birthdays and check whether two share the same day and month. Surprisingly, there is about a 50% chance that they do – and with 50 people the chance rises above 97%. Generate several lists and count how often you find a match.
Privacy
All dates are generated in your browser. They are fictional and not connected to any real person.
Frequently Asked Questions
How is the age range calculated?
Ages are worked out from today's date. With Min age 18 and Max age 65, every generated birthday belongs to someone who is at least 18 and at most 65 years old today. Each possible day in that window is equally likely.
Which zodiac dates do you use?
The common tropical western zodiac dates, for example Aries from March 21 to April 19 and Capricorn from December 22 to January 19. Exact boundaries vary by a day in some years depending on the source.
Are February 29 birthdays possible?
Yes. Leap days are part of the date range, so you will occasionally see February 29 in a leap year – useful for testing how your software handles leap-year birthdays.
Is this safe to use as test data?
Yes. The dates are random and not linked to any real person. They are ideal for filling in sign-up forms, database seeds and age-verification tests.