How to get local time in another time zone

问题

Using pure javascript (no jquery nor plugins), how do I convert one local time to another timezone?

For situation:

I am doing a countdown timer and I've set the end date as a javascript variable. I want to convert that variable to a local time depending on the client location/time zone.

var maintenanceEndDate = new Date("11/10/2015 00:00"); //This is the initial time,  based on the administrator's location
var maintenanceEndDateOffset = ????  //The above time converted to local time

and THEN I would want to convert both to UTC.

Any ideas?

回答1:

var now = new Date();

This will give you the client date and time.

now.getTimezoneOffset()

Will give you the offset between that timezone and UTC.

回答2:

You could specify your maintenance end time in UTC and let the local browser handle the time conversion for you:

var maintenanceEndDate = new Date("2015-11-10T00:00:00Z");
document.write('Local time: ' + maintenanceEndDate.toString() + '<br>')
document.write('UTC time: ' + maintenanceEndDate.toISOString())

回答3:

I suggest you to dive into the momentjs library which does exactly what you need: http://momentjs.com/ and http://momentjs.com/timezone/

来源：https://stackoverflow.com/questions/33607894/how-to-get-local-time-in-another-time-zone