Was the Giant talking Pacific Time?
In the opening of Ep 1, the Giant gave the clue "430" - pronounced "four thirty". Was he referring to "4:30 am"? The Trinity atomic blast occurred at 5:29 am Mountain Time as pointed out specifically in Ep 8. This affirms the theory of a rift in time and space created by the blast, simultaneously opening a doorway to the Black Lodge in Twin Peaks - which is in Pacific Time.
5:29 or 5:30 AM ?
The Explosion happened precisely at 5:30 AM according to the official U.S Department of Energy page :