Who cares what time it is at bitcointalk?
Last time I checked, most places in the world are on "whole hour" timezones offset... so +1 UTC, -5 UTC, +12 UTC etc... so it really makes no difference where in the world you are... Just do it at the start of the hour.
The only places that use something different are "North Korea, Newfoundland, India, Iran, Afghanistan, Burma, Sri Lanka, the Marquesas"... if you happen to be on a X.5 hr timezone (Like India at +5.5)... then you need to submit at XX:30:00 at your location.