change the date with swift

import UIKit

classViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate{

    @IBOutlet weak var Picture 1: UIButton!
    @IBOutlet weak var Pictureimage1: UIImageView!
    @IBOutlet weak var Date: UILabel!
    @IBOutlet weak var Name: UILabel!
    @IBOutlet weak var WO: UILabel!
    @IBOutlet weak var Card: UILabel!
    @IBOutlet weak var SelectDate: UITextField!
    @IBOutlet weak var text1: UITextField!
    @IBOutlet weak var text2: UITextField!
    @IBOutlet weak var text3: UITextField!
    @IBOutlet weak varbut:UIButton!
    @IBOutlet weak var sub:UILabel!

    let nowDate=NSDate()
    let dateFormat = DateFormatter()
    let inputDatePicker=UIDatePicker()

    override func viewDidLoad(){
        super.viewDidLoad()

        dateFormat.dateFormat="yyyy/MM/dd"
        self.SelectDate.text=dateFormat.string (from: nowDate as Date)
        self.SelectDate.delegate=self

        inputDatePicker.datePickerMode=UIDatePickerMode.date
        self.SelectDate.inputView=inputDatePicker

        letpickerToolBar=UIToolbar(frame:CGRect(x:0,y:self.view.frame.size.height/6,width:self.view.frame.size.width,height:40.0))
        pickerToolBar.layer.position = CGPoint (x:self.view.frame.size.width/2, y:self.view.frame.size.height-20.0)
        pickerToolBar.barStyle=.blackTranslucent
        pickerToolBar.tintColor=UIColor.white
        pickerToolBar.backgroundColor=UIColor.black

        letspaceBarBtn = UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.flexibleSpace, target:self, action:Selector(("a:"))

        let toolBarBtn = UIBarButtonItem(title: "OK", style: .done, target:self, action:Selector(("toolBarBtnPush:"))

        pickerToolBar.items=[spaceBarBtn, toolBarBtn]
        self.SelectDate.inputAccessoryView=pickerToolBar
    }

        US>func toolBarBtnPush (sender: UIBarButtonItem) {
            letpickerDate=inputDatePicker.date
            self.SelectDate.text=dateFormat.string (from:pickerDate as Date)

            self.view.endEditing(true)
        }
}