Different dates on virtual servers?

Ok - this is a long shot. I'm supporting a PHP3/Apache/Oracle system that has some issues related to the upcoming Sep 3 2001 event when the UNIX timestamp changes from 9 digits to 10. I'd like to run some tests involving a system date after Sep 3 on our Solaris server that houses all of our virtual web servers on Apache. Unfortunately changing the system date would affect all of the other virtual servers too. So I have a 2 part question. Does anyone know if PHP gets its system date from the host web server or the OS. And, if I'm lucky enough for it to be the web server... Is there a way in Apache to add an offset to the system clock for a single virtual server. (So I can make one virtual host think it's September already) I told you it was a long shot :) Anybody??