code: public function unschedule_specific_event( $timestamp = '' ) {
  		if ( empty( $timestamp ) ) {
  			$timestamp = wp_next_scheduled( $this->args[ 'name' ], $this->args[ 'args' ] );
  		}
  		wp_unschedule_event( $timestamp, $this->args[ 'name' ], $this->args[ 'args' ] );
  	}
docs: UnSchedule the event
  
  @since    1.0.0
  
  @param number $timestamp The timestamp to remove
  
  @return void