9-9-9

September 9, 2009, is the 252nd day of the year, 252 adds to 9, and 09-09-09 = 27.
09-09-09 is also the last of the single-digits dates for quite a while - 92 years to be precise.
It is also the upside-down number of "the beast" - satan = 666, of course.
The day itself falls on a Wednesday and both Wednesday & September have 9 letters.