Same as jDateTime::Date method
but this one works as a helper and returns Gregorian Date
in case someone doesn't like to pass all those false arguments
to Date method.
e.g. $obj->gDate("Y-m-d") //Outputs: 2011-05-05
$obj->date("Y-m-d", false, false, false); //Outputs: 2011-05-05
Both return the exact same result.