FW: Fingerprinting timezones

[Kelly Grizzle]

There is a javascript library that does this reasonably well for a subset of 
timezones - https://bitbucket.org/pellepim/jstimezonedetect/wiki/Home.  It has 
part of the tz database inside the javascript.  This is very useful if you want 
to determine the timezone from the client only.  As was suggested, you can also 
calculate UTC offsets at various dates and send these to a server to let the 
server calculate the time zone.

--Kelly