Being able to instantly pluck the day of the week for a given date out of your mind can seem like a magic trick, but it’s actually not that difficult—if you’re willing to put in a little work and do a little math.
Being able to instantly pluck the day of the week for a given date out of your mind can seem like a magic trick, but it’s actually not that difficult—if you’re willing to put in a little work and do a little math.