This week has the last two cool number dates for July.  Unfortunately, August is worse!  Five cool dates in July, but only four in August.  Dearth days of summer.

Wednesday, 7/22/15, is a Minus Subtract date, since 7 – 22 = -15.

Thursday, 7/23/15, is the half-back day of the month.  Start at 7, go positively 16 to 23, then come back (negatively) half way (8) to 15.