Perhaps it could be called duodecimal day if you look at the numbers, or ternary day if you look at the digits. In either case, have a wonderful 12-12-12 day!
After being treated to a dozen similar days over the last few years (here, e.g.), we must now alas face a desert stretch of a few weeks longer than eighty-eight years until the next time the month, date, and year will all align.
Though at least we’ll have 11/12/13 next year, and 12/13/14 the year after. And of course the best pi day of our lives on 3/14/15 (at 9:26:53am). So I guess, even without repeated numbers, we still have a few good years ahead of us 🙂 .