218604 2020-11-05 01:00:52 -0800 [JSC] Make a bit more consistent for local time parsing 2020-11-12 01:01:20 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=161623 InRadar P2 Normal --- 1 ysuzuki ysuzuki webkit-bug-importer oldest_to_newest 1704773 0 ysuzuki 2020-11-05 01:00:52 -0800 (In reply to Joren Broekema from comment #9) > I looked a bit further. > https://en.wikipedia.org/wiki/Daylight_saving_time#History gives some > background on why this is happening for certain years. Also, I don't think > Intl is at fault, I have issues with the native Date parsing process > > > new Date('1939-12-06') > < Wed Dec 06 1939 01:00:00 GMT+0100 (CET) > > > new Date('12/06/1939') > < Wed Dec 06 1939 00:00:00 GMT+0100 (CET) > > So it parses it differently based on how you supply the date string. This is different issue from this bug. I think one format is parsed as local time, an the other is parsed UTC. 1704776 1 ysuzuki 2020-11-05 01:03:56 -0800 We should get rid of wtf/DateMath.h's local time calculation. This should be done through icu::TimeZone's cache. 1706797 2 webkit-bug-importer 2020-11-12 01:01:20 -0800 <rdar://problem/71317850>