This historial day Unix time turned 1234567890 at Sat Feb 14 00:31:30 CET 2009. Unix time or POSIX time counts the number of seconds elapsed since midnight January 1, 1970 UTC. Unix time does not count leap seconds.

[root@fortran ~]# date +%s
1234567890

Last major celebration for Unix time was Sun Sep 9 03:46:40 CET 2001 when it turned 1000000000.