Ooops!
I slept right through it. It happened overnight and I didn't even set my alarm to be able to tell my grandchildren that I was there. Where? Here:

Where New York Times columnist David Pogue latched onto this fascinating factoid, there's no telling. But as randomly useless bits of trivia go, this is definitely worth noting.

Pogue writes: Late tonight -- specifically, 123 seconds after 1:00 a.m. -- the time and date, for the first time in all of humanity, will be 01:02:03 04/05/06.

And, Pogue points out, this moment will never come again.

Well, at least not exactly. In Europe, which renders the date before the month, this singular moment will occur next month, at 123 seconds past 1 a.m. on 4 May. And after that, it most definitely will never occur again.
--Wired News

But what about 1000 years from now when it is 3006. Are we assuming that we won't be using the same numbering or month system or even the same clock? Probably not a bad guess.