Happy Binary Day! A Binary Day is a date that only consists in binary numbers, 0’s and 1’s. 11-11-11 is the last Binary Date in almost a century, the next one is not until January 1, 2100. To celebrate Binary Day, here is a Howtoon, Bit By Bit that teaches you how to count in binary using your hands. 01000101 01101110 01101010 0110111101111001!