Getter and Setter of a variable with different type Swift

I want selectedDate setter of type Date and getter to be of type String.

 var selectedDate: Any? {
    get {
        //will return String
        return DateTimeUtils.sharedInstance.formatFancyDate(date: self.selectedDate as! Date)
    }
    set(newValue) {
        //will Set Date
        self.selectedDate =  DateTimeUtils.sharedInstance.dateFromStr(dateStr:newValue as! String)
    }
}

Though i know work around but still wanna do it with setter and Getter in swift.

Thanks in Advance!!