Looking back at the clarification of what the OP wanted to do, I've got
this to recommend;

If your users are talking to your server via the internet and not via a VPN
connection, instead of relying on what time zone your users browser is
giving you, look at what IP they're calling in from and do an IP to
geographical look up to find out where they are.  From there you'd be able
to catalog a 'best time of contact' based on what the Geolocation service
gives you.

Doing a quick google search on "ip to geo" I found these two:
http://www.iplocation.net/ and http://www.geoiptool.com/

By the looks of it, for a modest yearly fee, you'd be able to download a
database of IPs to locations and you'd be able to get time zone information
right from there.
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