According to the UNIX time (or POSIX time), some days (exactly the February 13, 2009 at 21:31:30) UTC whas the 1.234.567.890 day for the UNIX users (in this day I remember i was using FreeBSD), because 123456789 was the number of seconds passed since the creation of UNIX (January 1, 1970, aka "Unix epoch") until this date. You don't still understand? check this article:
[link] .