April 20, 2015
#1514: PermaCal explain
[Megan and Cueball are in the panel. Cueball appears to be holding a phone, tapping.]
Megan: What day is it?
Cueball: Sunday the 19th.
Megan: But you said it was the 19th yesterday.
Cueball: It changed again? Crap, better add another leap day.
[Caption below the panel:]
My simplified calendar system assumes the date never changes, then corrects any drift via leap days.