Calculate timezone difference in jquery

Question

I have two timezone js string variable.

var User_Timezone = new Date(); // current user system timezone
var User_Timezone= String(User_Timezone);

//User_Timezone has value = "Fri Feb 21 2014 04:29:49 GMT-07:00 (US Mountain Standard Time)";

var Admin_Timezone = "(GMT-06:00)-Central Time (US & Canada)"; //always same

I want to calculate time difference(in minutes) between Admin Timezone & Client Timezone.

Like:

var TimezoneDifference = Admin_Timezone - User_Timezone; // difference in minutes

How should I do this in jQuery?

Client timezone varies when any client access my page from different timezone but admin timezone is always same.

I need only difference between admin and client timezone.

Answer 1

Since your server is always in GMT-6, or 360 minutes behind GMT, you can use getTimezoneOffset() to get the client zone and subtract the latter from 360 to get the difference in minutes.

i.e.

var diff = 360 - (new Date().getTimezoneOffset());

Note: Change 360 if you relocate your server to another timezone.