let difference = calendar.dateComponents([.day, .hour, .minute], from: start, to: end!)

let start = Date()
    let formatter = DateFormatter()
    formatter.dateFormat = "MM/dd/yy hh:mm a"
    let end = formatter.date(from: dateString)

    let calendar = Calendar.current
    let difference = calendar.dateComponents([.day, .hour, .minute], from: start, to: end!)