Do you have twelve coins handy? You can lay them out on a piece of cardboard to keep track of the month, day, and day of the week, as shown here at Evil Mad Scientist Laboratories. Here’s the one I made:
Think of each penny as one bit, with heads meaning 1 and tails meaning 0. Each column is read as a binary number, from top to bottom.
The image shows Thursday, January 1st. Here’s how to interpret it:
- Left column: Day of the week. The days of the week are numbered 1 through 7, indicating Sunday through Saturday. The day of the week is 101, which is 5, so it’s Thursday.
- Middle column: Month. The months are numbered 1 through 12, indicating January through December. The month is 0001, or 1, so it’s January.
- Right column: Day. The days are numbered 1 through 31, indicating the 1st through the 31st. The day is 00001, or 1, so it’s the 1st.
Just to make sure you get it, here’s what Saturday, July 31st would look like: