Moment.js - How To Detect Daylight Savings Time And Add One Day

Question

I need to create Date Objects from strings of Date data for every hour of every day since the year 2000.

The strings look like this for every hour, in a Mont

Answer 1

To detect DST, use the .isDST() method: http://momentjs.com/docs/#/query/is-daylight-saving-time/

moment([2011, 2, 12]).isDST(); // false, March 12 2011 is not DST
moment([2011, 2, 14]).isDST(); // true, March 14 2011 is DST

Using this test, you should be able to determine how to modify your program's behavior accordingly.

Answer 2

Here's how I made a little checker:

var curDst = dtdate.isDST()
var prevDst = moment(dtdate).clone().subtract(1, "day").isDST();
var nextDst = moment(dtdate).clone().add(1, "day").isDST();
var isDstChangeDate = (curDst !== nextDst) === true || (curDst === prevDst) !== true;