Silver Challenge: Dark Mode (another way)

iOS Programming: The Big Nerd Ranch Guide (6th Edi 5. View Controller
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// my add for the Silver Challenge
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated);
let date = getCurrentTime()
let hour: Int = Int(date)!
if (hour >= 19 || hour <= 7) {
view.backgroundColor = UIColor.black
}
}

// my add for the Silver Challenge
func getCurrentTime() -> String {
let date = Date()
let formatter = DateFormatter()
formatter.dateFormat = "HH"
let time = formatter.string(from: date)
return time
}