Pass date data from a Picker to another view controller in Swift - swift

Question

I want to be able to choose a time via a picker on one view and pass that data onto another view.
I am able to do this as a string but how do I pass the time data in order to do calculation.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "segue1" {
let destinationController = segue.destination as! SecondViewController
destinationController.timeLabelTextOut = timeLabel.text!
}
}
#IBAction func dayFinishTimePicker(_ sender: Any) {
let timeformat = DateFormatter()
timeformat.dateFormat = "HH:mm"
let finishTime = timeformat.string(from: dayFinishTimePicker.date)
timeLabel.text = finishTime
}

Answer 1

Pass the date itself and format it there to get the time inside viewDidLoad of the next vc
destinationController.dateSent = dayFinishTimePicker.date

Answer 2

Firstly i would declare finishTime var outside the function and make it a var:
var finishTime = Date()
In SecondViewController i would create a var fTime like that:
var fTime = Date()
Then i would write in prepare func:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "segue1" {
let destinationController = segue.destination as! SecondViewController
destinationController.fTime! = self.finishTime
destinationController.timeLabelTextOut = timeLabel.text!
}
}
And the #IBAction function goes like that:
#IBAction func dayFinishTimePicker(_ sender: Any) {
let timeformat = DateFormatter()
timeformat.dateFormat = "HH:mm"
self.finishTime = dayFinishTimePicker.date
timeLabel.text = timeformat.string(from: dayFinishTimePicker.date)
}