138427 2014-11-05 08:58:02 -0800 Incorrect timezone information used for British Standard time for 1970 2016-07-18 21:09:43 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 1 bzbarsky webkit-unassigned ggaren mark.lam msaboff oldest_to_newest 1046481 0 bzbarsky 2014-11-05 08:58:02 -0800 Consider this expression: (new Date(0)).toLocaleString() When run in the UK timezone, JavaScriptCore returns: "January 1, 1970 at 1:00:00 AM GMT+1" which is correct: at the time BST was GMT+1 due to he British Standard Time experiment; see http://en.wikipedia.org/wiki/British_Summer_Time#Periods_of_deviation However this expression: +(new Date(1970, 0, 1)) returns 0 in JavaScriptCore, whereas the correct value is -3600000, because the provided date/time is in local time, which was one hour ahead of GMT in 1970.