Those are both supposed to return false. isDSTShifted() tells you whether the datetime you entered was shifted by the library because it doesn't exist in daylig

Those are both supposed to return false. isDSTShifted() tells you whether the datetime you entered was shifted by the library because it doesn't exist in daylight savings time. For example, in pseudocode, if you try to "add 1 day" to "2:30AM the day before DST begins", it'll be shifted because there is no 2:30AM on the resulting date. The clock skips from 1:59AM to 3AM that day. Here's a fiddle showing isDSTShifted() working with the US DST start (I don't know what date to use for your location): http://jsfiddle.net/d9tz0tv1/ http://jsfiddle.net/d9tz0tv1/ I think you're looking for isDST()?