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lang-js
date.setMinutes(date.getMinutes() + ...)will fail crossing over Daylight Saving boundaries. For example (assuming '2014-03-09' is a Daylight Saving boundary):var d = new Date('2014-03-09 01:59:00'), f = new Date(d.getTime()); d.setMinutes(d.getMinutes() + 30);dis now 30 minutes earlier, not later, thanf.fandd, you'll see one says "GMT-0500" the other says "GMT-0400" (or whatever your time zone is). Also, if you call.getTime()on bothfandd, you'll see thatfis larger thand(i.e. later).01:89would become02:29, which doesn't exist on the day you "spring forward". Chrome decides that should be01:29, FF decides on03:29. On the night when you "fall back", both browsers skip the "fall back" hour and jump ahead by 90 minutes, to02:29. Here are some JSFiddle demos: "spring forward" / "fall back"