UIDatePicker in UIPopover

Now since you have tagged iPhone It can clearly be assumed that you are trying to use UIPopoverController in iPhone But UIPopoverController is available only for iPad. So it is resulting in a crash since iPhone doesn't recognize that controller.

Try with below code. It will work fine:

Objective-C

- (IBAction)showDatePicker:(UIButton *)sender {
    UIDatePicker *datePicker = [[UIDatePicker alloc]init];//Date picker
    datePicker.frame = CGRectMake(0, 0, 320, 216);
    datePicker.datePickerMode = UIDatePickerModeDateAndTime;
    [datePicker setMinuteInterval:5];
    [datePicker addTarget:self action:@selector(dateChanged:) forControlEvents:UIControlEventValueChanged];//need to implement this method in same class


    UIView *popoverView = [[UIView alloc] init];   //view
    popoverView.backgroundColor = [UIColor clearColor];
    [popoverView addSubview:datePicker];
    // here you can add tool bar with done and cancel buttons if required

    UIViewController *popoverViewController = [[UIViewController alloc] init];
    popoverViewController.view = datePicker;
    popoverViewController.view.frame = CGRectMake(0, 0, 320, 216);
    popoverViewController.modalPresentationStyle = UIModalPresentationPopover;
    popoverViewController.preferredContentSize = CGSizeMake(320, 216);
    popoverViewController.popoverPresentationController.sourceView = sender; // source button
    popoverViewController.popoverPresentationController.sourceRect = sender.bounds; // source button bounds
    //popoverViewController.popoverPresentationController.delegate = self;
    [self presentViewController:popoverViewController animated:YES completion:nil];
}
- (void)dateChanged:(UIDatePicker *)datePicker {
    NSLog(@"DATE :: %@", datePicker.date);
}

Swift 4.2

 @IBAction func showDatePicker(_ sender: UIButton) {
    let datePicker = UIDatePicker()//Date picker
    let datePickerSize = CGSize(width: 320, height: 216) //Date picker size
    datePicker.frame = CGRect(x: 0, y: 0, width: datePickerSize.width, height: datePickerSize.height)
    datePicker.datePickerMode = .dateAndTime
    datePicker.minuteInterval = 5
    datePicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)

    let popoverView = UIView()
    popoverView.backgroundColor = UIColor.clear
    popoverView.addSubview(datePicker)
    // here you can add tool bar with done and cancel buttons if required

    let popoverViewController = UIViewController()
    popoverViewController.view = popoverView
    popoverViewController.view.frame = CGRect(x: 0, y: 0, width: datePickerSize.width, height: datePickerSize.height)
    popoverViewController.modalPresentationStyle = .popover
    popoverViewController.preferredContentSize = datePickerSize
    popoverViewController.popoverPresentationController?.sourceView = sender // source button
    popoverViewController.popoverPresentationController?.sourceRect = sender.bounds // source button bounds
    popoverViewController.popoverPresentationController?.delegate = self // to handle popover delegate methods 
    self.present(popoverViewController, animated: true, completion: nil)

    }
    @objc func dateChanged(_ datePicker: UIDatePicker) {
        print("DATE :: \(datePicker.date)")
    }

Same code will work iPhone also if you implement below delegate respective in view controller

extension YourViewController : UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        // Force popover style
        return UIModalPresentationStyle.none
    }
}