Quick support different timezone through rails config.time_zone

read timezone from rails config, and configure graphite data fetch uri with timestamp associated with set timezone, and send timezone inforation along with request to graphite server
I think your are right, looking at the 
* Graphite Api doc (http://graphite.readthedocs.org/en/latest/render_api.html#tz) and 
* ActiveSupport doc (http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html)

it should be Time.zone.tzinfo instead