def days_range
        ws = Date::DAYS_INTO_WEEK[@options[:week_start]]
        (ws...ws+number_of_days_per_week).map{ |d| d % 7 }
      end
def days_range
        ws = Date::DAYS_INTO_WEEK[@options[:week_start]]
        (ws...ws+number_of_days_per_week).map{ |d| d % 7 }
      end
Get the range of days to show