Set the timezone within an around filter

set_time_zone.rb

around_filter :set_time_zone
                                                                                 
private
                                                                                 
def set_time_zone
  old_time_zone = Time.zone
  Time.zone = browser_timezone if browser_timezone.present?
  yield
ensure
  Time.zone = old_time_zone
end
                                                                                 
def browser_timezone
  cookies["browser.timezone"]
end