Ok, VALVe's timezone is -8GMT or Pacific Time. They're located in the State Of Washington.
Here are the timezones w/ the provided release time:
    * -12GMT || 8:00PM (Nov 15th)
    * -11GMT || 9:00PM (Nov 15th)
    * -10GMT || 10:00PM (Nov 15th)
    * -9GMT || 11:00PM (Nov 15th)
    * -8GMT || 12:00AM (Nov 16th) (VALVe's Time)
    * -7GMT || 1:00AM (Nov 16th)
    * -6GMT || 2:00AM (Nov 16th)
    * -5GMT || 3:00AM (Nov 16th)
    * -4GMT || 4:00AM (Nov 16th)
    * -3GMT || 5:00AM (Nov 16th)
    * -2GMT || 6:00AM (Nov 16th)
    * -1GMT || 7:00AM (Nov 16th)
    * GMT || 8:00AM (Nov 16th)
    * +1GMT || 9:00AM (Nov 16th)
    * +2GMT || 10:00AM (Nov 16th)
    * +3GMT || 11:00AM (Nov 16th)
    * +4GMT || 12:00PM (Nov 16th)
    * +5GMT || 1:00PM (Nov 16th)
    * +6GMT || 2:00PM (Nov 16th)
    * +7GMT || 3:00PM (Nov 16th)
    * +8GMT || 4:00PM (Nov 16th)
    * +9GMT || 5:00PM (Nov 16th)
    * +10GMT || 6:00PM (Nov 16th)
    * +11GMT || 7:00PM (Nov 16th)
    * +12GMT || 8:00PM (Nov 16th)
*Note DayLight Savings: For those South of the Equator - your GMT time will be an hour ahead. So if your GMT Zone is listed 6 on here, then it will be released and hour ahead or 7 in this example.