Twelve times a century, indeed, the first 12 years in the century, there will be a day when the day, month, and year all line up, then nothing for the following 88 years. But 10 is the only round number, and round numbers seem to have a certain panache in the culture.
Maybe it’s because we have fingers and ten toes, which (eventually) led us to use the decimal system, thanks to the number zero.
Maybe that’s why we have the 10 Commandments, formerly 15, according to Mel Brooks.
There are other numeric patterns related to dates, but they are imperfect, such as 01/02/03. The problem is that some places recognize the month/day/year, such as the United States, while most CIVILIZED people prefer the smallest to largest logic of day/month/year
David Letterman came up with a Top Ten list, not a Top 12 or Top 9. So tell me: what will YOU be doing (or what were you doing) on 10/10/10 at 10:10? I will be in rehearsal for our church choir.