ensure all timestamps from the message DB go through a zone

lib/postal/message_db/click.rb

@@ -6,7 +6,7 @@ module Postal
         @url = link['url']
         @ip_address = attributes['ip_address']
         @user_agent = attributes['user_agent']
-        @timestamp = Time.at(attributes['timestamp'])
+        @timestamp = Time.zone.at(attributes['timestamp'])
       end
 
       attr_reader :ip_address

lib/postal/message_db/delivery.rb

@@ -26,7 +26,7 @@ module Postal
       end
 
       def timestamp
-        @timestamp ||= @attributes['timestamp'] ? Time.at(@attributes['timestamp']) : nil
+        @timestamp ||= @attributes['timestamp'] ? Time.zone.at(@attributes['timestamp']) : nil
       end
 
       def update_statistics

lib/postal/message_db/load.rb

@@ -5,7 +5,7 @@ module Postal
       def initialize(attributes)
         @ip_address = attributes['ip_address']
         @user_agent = attributes['user_agent']
-        @timestamp = Time.at(attributes['timestamp'])
+        @timestamp = Time.zone.at(attributes['timestamp'])
       end
 
       attr_reader :ip_address

lib/postal/message_db/message.rb

@@ -97,21 +97,21 @@ module Postal
       # Return the timestamp for this message
       #
       def timestamp
-        @timestamp ||= @attributes['timestamp'] ? Time.at(@attributes['timestamp']) : nil
+        @timestamp ||= @attributes['timestamp'] ? Time.zone.at(@attributes['timestamp']) : nil
       end
 
       #
       # Return the time that the last delivery was attempted
       #
       def last_delivery_attempt
-        @last_delivery_attempt ||= @attributes['last_delivery_attempt'] ? Time.at(@attributes['last_delivery_attempt']) : nil
+        @last_delivery_attempt ||= @attributes['last_delivery_attempt'] ? Time.zone.at(@attributes['last_delivery_attempt']) : nil
       end
 
       #
       # Return the hold expiry for this message
       #
       def hold_expiry
-        @hold_expiry ||= @attributes['hold_expiry'] ? Time.at(@attributes['hold_expiry']) : nil
+        @hold_expiry ||= @attributes['hold_expiry'] ? Time.zone.at(@attributes['hold_expiry']) : nil
       end
 
       #

lib/postal/message_db/statistics.rb

@@ -45,7 +45,7 @@ module Postal
           end
         end
         @database.select("stats_#{type}", :where => {:time => items.keys.map(&:to_i)}, :fields => [:time] | counters).each do |data|
-          time = Time.at(data.delete('time'))
+          time = Time.zone.at(data.delete('time'))
           data.each do |key, value|
             items[time][key.to_sym] = value
           end

lib/postal/message_db/webhooks.rb

@@ -40,7 +40,7 @@ module Postal
         end
 
         def timestamp
-          Time.at(@attributes['timestamp'])
+          Time.zone.at(@attributes['timestamp'])
         end
 
         def event