def holiday?(arg)
      date = to_date(arg)
      holidays(start_date: date, end_date: date + 1.day, limit: 1).length > 0
    end
def holiday?(arg)
      date = to_date(arg)
      holidays(start_date: date, end_date: date + 1.day, limit: 1).length > 0
    end
def holiday? ( arg ) date = to_date ( arg ) holidays ( start_date : date , end_date : date + 1 . day , limit : 1 ) . length > 0 end
whether arg is holiday
 @param arg [#to_date, String] {Date}, {Time}, or date like String (ex. "YYYY-MM-DD")
whether arg is holiday