public static function addDecade($ts = null, $num = 1)
	{
		return sfTime::add($ts, $num, sfTime::DECADE);
	}
public static function addDecade($ts = null, $num = 1)
	{
		return sfTime::add($ts, $num, sfTime::DECADE);
	}
public static function addDecade ( $ ts = null , $ num = 1 ) { return sfTime :: add ( $ ts , $ num , sfTime :: DECADE ) ; }
Adds the specified number of decades to the timestamp.

@param	timestamp
@param	int
@return	timestamp
Adds the specified number of decades to the timestamp .