999999999999
as milliseconds is
Sun Sep 9 01:46:39 2001.

http://web.archive.org/web/*/www.2chan.net/
Jul 22, 2001 - Domain registered, no content
Sep 23, 2001 - Site exists proper

Pretty close...

>>9

It seems like Futaba didn't have any imageboards before Feb 02, 2003, though.