There's a webservice that you can invoke. See -

http://www.xmethods.net/ve2/ViewListing.po?key=uuid:6F25C11C-7087-73ED-20B8-71AF6DC69E42

And you can use SOAP:Lite to query the web service with minimal effort.
ammudi@gmail.com>
To: beginners-cgi@perl.org
Sent: Monday, May 25, 2009 7:42:12 AM
Subject: Auto detect timezone

Hello,

I need to detect the timezone based on Date, City(State/ZIP), Country(USA
for now) as part of my application.

Any idea about a perl module which does the above?

Thanks,
Rajesh