Fun Age Calculator
What Day Was I Born?
Enter your birthday to find the exact day of the week you were born.
Find the day you were born
What day of the week was I born?
Every calendar date has one exact weekday. Enter your month, day and year and the calculator tells you whether you were born on a Monday, Tuesday, Wednesday, Thursday, Friday, Saturday or Sunday.
You do not need to know your birth time. The calendar date alone is enough to find the weekday.
This also works as a simple day-of-birth calculator: the result includes your weekday, your numbered day within the year and whether the year you were born was a leap year.
Why the birth year is required
The same month and day can fall on a different weekday each year, so month and day by themselves are not enough. The year completes the date and lets the calculator find the correct place in the calendar.
What number day of the year was I born?
Your result also shows where your birthday fell within its year. January 1 is day 1. December 31 is day 365 in a common year and day 366 in a leap year. Dates after February 29 have a day number one higher in leap years.
Will my birthday be on the same weekday again?
Yes, but not on a simple seven-year schedule. A normal year usually shifts the weekday by one day. A leap year can add another shift, depending on whether February 29 falls before the birthday you are comparing.
Use the birthday calculator when you want the weekday of your next birthday rather than your original birth date.
What about a February 29 birthday?
February 29 exists only in leap years, but the weekday of an actual February 29 birth is still a normal calendar fact. Choose February 29 and a valid leap year and the calculator will find it.
Can I check an older family birthday?
The calculator currently accepts years from 1900 through the current year. That is enough for most living users and many family-history checks.
For much older historical dates, calendar systems can vary by country and period. This site follows the Gregorian calendar rules used by modern browsers.
Does my birth weekday mean anything about me?
The weekday itself is simply a calendar fact. Being born on a Monday, Friday or Sunday does not scientifically determine personality, luck or compatibility.
There are old traditions and sayings connected with days of the week, but this calculator sticks to what the calendar can actually tell you.
What else can I learn from my birth date?
After finding your birth weekday, you can calculate how many days you have been alive, see your next birthday countdown or find round-number age milestones.
Common questions
How can I find what day of the week I was born?
Enter your complete date of birth. The calculator looks up that calendar date and returns the weekday.
Do I need my birth time?
No. The weekday depends on the calendar date, so month, day and year are enough.
Does a leap year change the weekday?
Leap years affect how weekdays shift from one year to the next, but your original birth date still has one exact weekday.
Can I find the weekday of my next birthday?
Yes. Use the Birthday Calculator to see the weekday of your next birthday.
What number day of the year was I born?
The result also shows your birth date's day number within that year, from 1 through 365 or 366.