self.days.each do |day|
      if day == self.begin_date.to_date # sprint begin date, set to committed hours
        hours_cache = self.committed_task_hours
      elsif day == Time.zone.now.to_date # today, set to total hours
        hours_cache = self.total_task_hours
      else
        hours_cache = self.committed_task_hours
        day_exists_in_hours_log = !(hours_log.find {|h| h[:day] == day}).nil?

        if day_exists_in_hours_log
        hours_log.each do |log|
          if log[:day] > day
            hours_cache += log[:hours]
          end
        end
        else
          hours_cache = nil if day > Time.zone.now.to_date
        end
      end

      burndown_data.push({:day => day.to_datetime.utc.to_time, :hours => hours_cache})
    end

    burndown_data