Video_Post::get_iso_duration()

	public function get_iso_duration(){
		$seconds = $this->duration;
		$iso_format = 'PT';

		if ( $seconds > 3600 ) {
			$hours = floor( $seconds / 3600 );
			$iso_format .= $hours . 'H';
			$seconds = $seconds - ( $hours * 3600 );
		}

		if ( $seconds > 60 ) {
			$minutes = floor( $seconds / 60 );
			$iso_format .= $minutes . 'M';
			$seconds = $seconds - ( $minutes * 60 );
		}

		if ( $seconds > 0 ) {
			$iso_format .= $seconds . 'S';
		}

		return $iso_format;
	}