Fascinating Calendar Tidbit # 54,315,643,051: The way the patterns play out, the day of the week for Christmas is 1 day later than the day of the week for Jan. 1st. Unless it's a leap year like 2016, then 2 days later. This serves as another example of how knowing the patterns allows you to know the day of the week for (at least some) dates without having to look it up. You can literally know it faster than you can use Google in some instances. Go ahead - verify it for yourself.