Show HN: How to mentally calculate the day of the week for any date

seanhunter

It's pretty bad form to give the doomsday algorithm and not give credit to John H. Conway who invented it. https://en.wikipedia.org/wiki/Doomsday_rule

zeech

Cool site! When I do this trick I prefer using Bob Goddard's 'first Sunday' method [0]. It minimises the number of operations you need to do and makes it so you only need to keep track of one running total. [0] https://firstsundaydoomsday.blogspot.com/2009/12/quick-start...

navaed01

V. Cool - thank you for building and sharing

mattdeboard

This is amazing! What a cool website.

mrheosuper

>The trick = nearest squad date → leftover → walk from the Doomsday. When i do the 31/OCT, the solution show 10/10 as nearest squadday, i though 11/7 is the nearest ?

Vishal_Max

Never thought of this , actually enjoyed learning it. Now it is time to surprise my friends.

santah

Awesome site and guide, I just don't understand why all dates have the month in front of the date. Isn't this very confusing to anyone outside US? I get why it defaulted to this format, but in this day and age - it's trivial to automatically adjust it to the user's localization / preferences.