It's 12-12-12. It's the last time we will experience a sequential day, month, and year combination in our lifetimes. The next time will be 01/01/01 in 2101.
For more on 12-12-12 see:
TWELVE NOTABLE TWELVES:
12 days of Christmas.
12 months in a year.
12 pairs of ribs in most humans.
12 steps of Alcoholics Anonymous.
12 hours on a clock face.
12 strikes to bowl a perfect game.
12 people have walked on the moon.
12 face cards in a deck.
12 apostles of Jesus.
12 jurors in felony trials in all but four states, federal and D.C. courts.
12 signs of the Zodiac.
12 inches in a foot.