How to check if DST (Daylight Saving Time) is in effect, and if so, the offset?

Question

This is a bit of my JS code for which this is needed:

var secDiff = Math.abs(Math.round((utc_date-this.premiere_date)/1000));
this.years = this.calculateUnit         


        

Answer 1

Is there an issue using the Date.toString().indexOf('Daylight Time') > -1

"" + new Date()

Sat Jan 01 100050 00:00:00 GMT-0500 (Eastern Standard Time)

"" + new Date(...)

Sun May 01 100033 00:00:00 GMT-0400 (Eastern Daylight Time)

This seems compatible with all browsers.