What Day Was I Born?
Find out what day of the week you were born on. Discover your birthday weekday and fun facts about it.
Enter a Date
How the Calculation Works
How It Works: Enter your birth date, and the calculator uses Zeller's algorithm—a mathematical formula—to determine the day of the week you were born.
Zeller's Algorithm: This classic formula calculates the day of the week for any date by analyzing the date's position in the calendar, accounting for leap years and the varying lengths of months. It's the same method used by most day-of-week calculators because it's reliable and efficient.
This page is focused on birth-date lookups: enter a date of birth to see its weekday. For other historical or future dates, use the Day of the Week Calculator.
Worked Example
Example 1: Born on March 15, 1995:
- Day of Week: Wednesday
Example 2: Born on July 4, 1976:
- Day of Week: Sunday
- Fun Fact: This was Independence Day and fell on a Sunday
Example 3: Born on December 25, 2000:
- Day of Week: Monday
- Fun Fact: Born on Christmas and a Monday
How to Use This Calculator
Fun Birthday Facts: Some cultures and traditions assign personality traits to the day of the week you were born. The nursery rhyme goes:
- Monday's child is fair of face
- Tuesday's child is full of grace
- Wednesday's child is full of woe
- Thursday's child has far to go
- Friday's child is loving and giving
- Saturday's child works hard for his living
- Sunday's child is bonny and blithe
While these are superstitions rather than scientific facts, it's fun trivia about your birth day!
Why It Matters: Knowing your birth day of the week can be a fun conversation starter, helps with genealogy research, or adds an interesting detail to your life story. Some people track which day of the week they were born and their children were born.
Frequently Asked Questions
How do I find out what day I was born?
Enter your birth date into this calculator. It instantly shows you the day of the week using Zeller's algorithm, which works for any historical or future date.
Does the day of the week I was born matter?
Scientifically, no—your day of birth doesn't determine your personality or fate. However, it's interesting trivia and adds a fun detail to your personal story.
Can I use this page for a historical or future date that is not a birth date?
This page is focused on birth-date lookups. For any other historical, current, or future date, use the Day of the Week Calculator.
What is Zeller's algorithm?
It's a mathematical formula developed in the 19th century that calculates the day of the week for any date. It accounts for leap years and varying month lengths, making it accurate across centuries.
Is there a rhyme about the day you're born?
Yes, the classic nursery rhyme "Monday's Child" assigns personality traits to each day. While it's folklore rather than fact, it's fun trivia many people know!
Can this calculator count down to my next birthday?
No. It tells you the weekday of a birth date. Use the Birthday Countdown calculator to see how long remains until your next birthday.