How to Figure Out the Day of the Week For Any Date Ever

To learn more about Brilliant, go to and sign up for free. First 200 people will get 20 off the annual Premium subscription. More info and sources below You can be a human computer too. Our cheat sheet: Want to go NEXT LEVEL Learn how to adjust for Julian calendar and BC dates You might think that computers are the only things that run algorithms, but you re wrong. Here s a neat mental trick for calculating the day of the week for any day ever, developed by famous mathematician John H. Conway Don t miss our next video SUBSCRIBE READ MORE: Martin Gardner, The Universe in a Handkerchief: Lewis Carroll s Mathematical Recreations, Games, Puzzles, and Word Plays FOLLOW US: Merch: Facebook: Twitter:DrJoeHanson okaytobesmart Tumblr: Instagram: DrJoeHanson It s Okay To Be Smart is hosted by Joe Hanson, Director: Joe Nicolosi Writer: Joe Hanson, Producer, editor, animator: Jordan Husmann Producer: Stephanie Noone and Amanda Fox Produced by PBS Digital Studios Music via APM Stock images from Shutterstock