This week has four different types of cool dates, on three different days! Since there were none last week, one thinks maybe cool days are not evenly distributed across weeks.

Monday, 1/13/14.  Addition Day.  1 + 13 = 14

Tuesday, 1/14/14.  This can be viewed as a Multiplication day ( 1 * 14 = 14)  or as a Reverse Division Day (14 / 1 = 14)

Wednesday, 1/15/14.  This is a Minus Subtract Day.  (1 – 15 = -14)