Every major patch (not hotfixes), start/end of bonus event, new season, etc. has always been 10 A.M. PST, since Blizzard is in California, USA. If you look back at the previous events, S1 had the Exp & Gold event end at 10 A.M. PST, S2 November event also ended at 10 A.M. PST, Midwinter Blight also ended at 10 A.M. PST, and logging into the game (as of right now) confirms, this one also ended at 10 A.M. PST
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