public static function getInstance()
 {
     if (self::$objInstance == null) {
         self::$objInstance = new NegDiaSemana();
     }
     return self::$objInstance;
 }
 public function consultarDiasSemana($arrStrFiltros)
 {
     return NegDiaSemana::getInstance()->consultar($arrStrFiltros);
 }