public static function convertToHuman( $timestamp, $format )
	{
		$human = "";
		if( $format == "date" )
			$human = date( "d.m.Y", (int) $timestamp );
		else if( $format == "monthdate" )
			$human = date( "m.Y", (int) $timestamp );
		else if( $format == "time" )
			$human = date( "H:i:s", (int) $timestamp );
		else if( $format == "datetime" )
			$human = date( "d.m.Y - H:i:s", (int) $timestamp );
		else if( $format == "duration" )
		{
			$hours	= str_pad( floor( $timestamp / 3600 ), 2, 0, STR_PAD_LEFT );
			$timestamp -= $hours * 3600;
			$mins	= str_pad( floor( $timestamp / 60 ), 2, 0, STR_PAD_LEFT );
			$timestamp -= $mins * 60;
			$secs	= str_pad( $timestamp, 2, 0, STR_PAD_LEFT );
			$human	= $hours.":".$mins.":".$secs;
		}
		else if( $format )
			$human = date( $format, (int)$timestamp );
		if( $human )
			return $human;
	}