allow timezone parameters to work correctly with charts

app/controllers/application_controller.rb

@@ -328,6 +328,9 @@ class ApplicationController < ActionController::Base
     # use the offset to find an appropriate timezone
     def set_timezone_from_offset(offset)
       offset = offset.to_i
+      # always set to UTC if offset is 0
+      return 'UTC' if offset == 0
+
       # keep track of the currently matched time zone
       current_zone = nil
 

app/helpers/feed_helper.rb

@@ -99,9 +99,15 @@ module FeedHelper
     empty_clone.attribute_names.each { |attr| empty_clone[attr] = nil }
     return empty_clone
   end
+
+  # get the time floored to the correct number of seconds
   def get_floored_time(input_time, seconds)
-    return Time.zone.at((input_time.to_f / seconds).floor * seconds)
+    floored_seconds = (input_time.to_f / seconds).floor * seconds
+    # offset the seconds by the current time zone offset
+    offset_seconds = Time.zone.now.utc_offset
+    return Time.at(floored_seconds - offset_seconds)
   end
+
   # slice feed into timescales
   def feeds_into_timescales(feeds, params)
 

app/models/daily_feed.rb

@@ -39,9 +39,11 @@ class DailyFeed < ActiveRecord::Base
     return output
   end
 
-  # checks to see if this is a daily feed
+  # checks to see if this is a daily feed, only works for timezone UTC (offset == 0)
   def self.valid_params(params)
-    (params[:timescale] == '1440' || params[:sum] == '1440' || params[:average] == '1440' || params[:median] == '1440') ? true : false
+    daily_params = (params[:timescale] == '1440' || params[:sum] == '1440' || params[:average] == '1440' || params[:median] == '1440') ? true : false
+    return daily_params && (Time.zone.name == 'UTC')
   end
 
 end
+