This image represents a specific date:
Disregard the poor quality of the image, consider all the little squares to be the same. :)
What specific date am I looking for? (Year, Month, Date)
Could it be:
2004, May 18th
Randy Johnson threw a perfect game in his last year as a Diamondback against the Atlanta Braves. The first for the Diamondbacks, too. This is known as 27 up, 27 down.
July 12, 1979
Because that date was
Disco Demolition Night, a promotion by Bill Veeck (as in Wreck), intended as a double header, but the second game was canceled due to the fracas and damage done during the first game.
The picture above shows an un-filled-out baseball scorecard, indicating (possibly) a game that was never played.
May 12, 1917
both pitchers had a no-hitter through 9 innings? http://www.baseball-reference.com/boxes/CHN/CHN191705020.shtml
March 31, 1998
The date of first Arizona Diamondbacks home game
The logo in the back of the image is the second Diamondbacks logo (which might be the date you're looking for too) and the squares are lined up like the pattern on a diamondback snake.
Really I can throw darts at a bunch of D-Backs dates, but I don't have any clue as to which one you're looking for :)
June 19, 1907
Placing the number 2727 (the count of squares twice, once for each row) in a Microsoft Excel cell and setting it to a date gives this date. EDIT: Also the format for the Excel date formula is Date(Year,Month,Day)
Is the answer
27/9/1980 (or 9/27/1980 for those in the US)
Because there are 27 squares in a block, 9 in a row. That small image in each box looks like pac-man and the release year for that was 1980.