MUNDANE MYSTERIES: When does the 12 Days of Christmas actually start?

MUNDANE MYSTERIES: When does the 12 Days of Christmas actually start?

I wonder this every time I hear the song. When are we supposed to start the “12 days” in the “The 12 Days of Christmas”? I always thought it was before or sometime in early December. Nope. It is actually about the 12 days AFTER Christmas, not before.  The last day always ends on January…