Enter your date and discover famous events that happened on the same weekday.
Shared Birth-Weekdays
Enter a date. See all dates in the current year that share the same weekday.
Training
Basic
Advanced
Pro
The Method
Basic Calculations
Random training uses the current year. Enter any date from 1700 to 2099.
B-Day Training
1700–2099. Find the B-Day anchor first. Then find the year step.
Score: 0 · Streak: 0
Press start.
Step 1: What is the B-Day anchor?
Step 2: What is the year step?
Pro Calculations
1700–2099. Harder challenges. Same B-Day Method.
Press start.
The B-Day Method
The B-Day Method is a simple training approach for seeing calendar patterns and finding weekdays mentally.
It is inspired by the classic Doomsday rule developed by John Horton Conway.
July 4 and October 31
always land on the same weekday in the same year.
04/04 · 06/06 · 08/08 · 10/10 · 12/12
same pattern. Same system.
Every 400 years, weekdays repeat.
June 6, 744 has the same weekday as June 6, 1944.
