Converts dates to your local timezone
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.
It uses the jsTimezoneDetect JavaScript script (for getting the local timezone),
and the Moment.js and Moment-Timezone JavaScript libraries (for converting the dates).
Also note: 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).
And, if you reopen Firefox e.g. stackexchange.com, then session restore uses the timestamps for the tooltips from cache, so the script uses these cached values (refreshing the page (F5) fixes the issue).