Scheduling storage expiry with multiple time zones

Question in regards to scheduling storage expiry.  When setting the schedule at the site level does it propogate to each individul EV server or is it based off the time of the local directory service?   For instance if i set it for 12 pm pacific time when will it run on an eastern time EV server or even an EV server in Europe?  The layout is one EV direcotry with multiple Ev servers nation wide.

Thanks in advance,