This script applies to StackExchange sites stackoverflow.com, stackexchange.com, superuser.com, etc.
The timezone that the StackExchange sites use is UTC i.e. +0000 (source)
So, this script converts the dates to your local timezone, in both:
2015-12-14 14:11:13Z, and in
Dec 14 at 14:11.
It also recalculates them whenever the page changes.
jsTimezoneDetect does not do geo-location, nor does it care very much about historical time zones.
e.g. it may get "Europe/Berlin" when the user is in fact in "Europe/Stockholm" (they are both identical in modern time).
answered 1 min agowill become
answered 2 min ago, and so on.
Related post I made in stackapps.com
Here's a script to convert dates to local timezone in Stack Exchange sites