Sunday, May 19 

>Once again, there are two All Prime days, where the month, day, and year are all prime numbers: 05/19/13 and 05/23/13.

>05/21/13 is a half-back day.  Start at the month and go to the day, then come half-way back to the year.  5 to 21 is 16, and 21 back to 13 is 8.

Half-back days are named in honor of all the retirees who move from Northern states (Michigan, Minnesota, New York, etc) to Florida, find out Florida is too hot, and then move to middle ground in Tennessee or North Carolina or around there someplace.

Every month this year (and for the near future) has one half-back day. Another post is coming that will explain how to calculate the day, given the month and year.