Return an object with an update data, that is pass in to a public static function

Question

How can I return an object with an update data, that is pass in to a public static function?

GetDate.dayName(MyDate.setDate(1984,3))
//MyDate with new info (year, month) will be pass into GetDate.dayName


package hwang.time
{

public class MyDate
{
    public static var getYear:Number;
    public static var getMonth:Number;

    public static function setDate(year:Number, month:Number = 1):Object
    {
        getYear = year;
        getMonth = month
        verify()
        return null
    }

    private static function verify():void
    {
        //something
    }
}
}

Answer 1

public static function setDate(year:Number, month:Number = 1):MyDate

    {
        getYear = year;
        getMonth = month
        verify()

        verify()

        return new MyDate
    }

Here's what I come up with.Thanks for helping anyway :)