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.
The algorithm works for any date in the past or future, making it useful for historical dates, future planning, or personal curiosity.
Worked Example
Example 1: Born on March 15, 1995:
- Day of Week: Tuesday
Example 2: Born on July 4, 1976:
- Day of Week: Monday
- Fun Fact: This was Independence Day and fell on a Monday
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 find out what day a historical date fell on?
Yes! This calculator works for any date in history. You can find out what day famous historical events fell on, what day a relative was born, or plan future dates.
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!
What day of the week is my next birthday?
If your birthday is March 15 and you were born on a Tuesday, your birthday changes to a different day each year (it shifts by one day each year, or two days in leap year years).