I'm using latest version of Lightroom CC 2015 and was re-doing some panorama stitching directly in Lightroom. I noticed that photos of the stack were moving around when sorted by date. Quite annoying. The fix seems to re-set the 5 hour time zone difference between Uruguay and Alaska.
Please add your vote and opinion to this topic in the official Adobe feedback forum: Lightroom CC: mind adjusted photo capture time when creating panoramas (and possibly hdrs too)
That thread has a workaround also.