One hundred forty-eight years ago was the first Cinco de Mayo (Spanish for, oddly enough, "May Five"). Whilst, at the time, it was considered a celebration of a great victory by the Mexicans over the French, nowadays it is considered a celebration of beer and a time for Mexican breweries to reflect upon their second-quarter earnings.
But, that's not the greatest moment in chronology. Not nearly!
2,921 days ago, digital calendars all across America read "05/04/03", to denote the arrival of May 4th, 2003 (this is in contrast to the rest of the civilised world, where 05/04/03 was seen 29 days prior -- or 2,950 days ago -- on April 5th, 2003).
2,190 days ago, digital calendars everywhere read "05/05/05", to mark May 5th, 2005.
20,440 days ago, people were writing "5/5/55" (May 5th, 1955) on their cheques.
1,460 days ago, American digital calendars read "05/06/07" -- May 6th, 2007. 1,428 days ago, the rest of the world's digital calendars read that same number, but on June 5th, 2007.
1,465 days from now, America's digital calendars will read "05/10/15" (May 10th, 2015).
I'm sure there's more, but, quite honestly, I've never been too keen on the number 5. Perhaps, if you have so much spare time it makes your teeth hurt, you can look up random stuff about the number 5 in chronology. The Wikipedia article on 1955 seems as good a place to start as any, yeah?