137140 2014-09-25 22:45:03 -0700 Date.getDate() returns bad values in some time zones 2014-09-30 14:47:43 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Mac Unspecified RESOLVED DUPLICATE 137003 InRadar P2 Normal --- 1 daniel webkit-unassigned barraclough daniel ggaren mark.lam oldest_to_newest 1037412 0 daniel 2014-09-25 22:45:03 -0700 Steps to reproduce 1) Set time zone of your OS X to Sydney - Australia 2) run following code in Safari Developer console a) //Date '2014-10-05' is the first Sunday in October. It is date when DST is changing in Australia. var d = new Date(2014, 9, 5, 0, 0, 0, 0); // 2014-10-05 00:00:00 d.toString(); b) new Date(2014, 9, 5, 0, 0, 0, 0).getDate(); 3) see result in console Expexcted result: 2a) Sun Oct 05 2014 00:00:00 GMT+1000 (EST) 2b) 5 Actual result: 2a) Sat Oct 04 2014 23:00:00 GMT+1000 (EST) 2b) 4 Additional info: - APPLE BUG ID #13201479 - http://www.timeanddate.com/time/aboutdst.html - http://stackoverflow.com/questions/14839244/why-is-safari-confused-about-date-getday-for-dst-start-in-sydney-aus-time-zon - It is also reproducible with New Zealand time zone with different date. Affected date is date of DST change. Used software Safari 7.1, Safari 8.0 1038112 1 ap 2014-09-29 16:45:45 -0700 Same as bug 137003? 1038155 2 daniel 2014-09-29 22:46:55 -0700 (In reply to comment #1) > Same as bug 137003? Yes, it looks as the same problem for New Zealand time zone. 1) Set time zone of your OS X to Wellington - New Zealand 2) run following code in Safari Developer console a) var d = new Date(2014, 8, 28, 0, 0, 0, 0); d.toString(); b) new Date(2014, 8, 28, 0, 0, 0, 0).getDate(); 3) see result in console Expexcted result: 2a) Sun Sep 28 2014 00:00:00 GMT+1200 (NZST) 2b) 28 Actual result: 2a) Sat Sep 27 2014 23:00:00 GMT+1200 (NZST) 2b) 27 1038357 3 ap 2014-09-30 14:47:43 -0700 Thank you for confirming, duping to the older bug. *** This bug has been marked as a duplicate of bug 137003 ***