iOS Swift - Get the Current Local Time and Date Timestamp

Question

I\'m trying to make an attendance app and I am really confused about date and time in iOS and Firebase.

I use date as Key, this is the structure of my Firebase datab

Answer 1

The simple way to create Current TimeStamp. like below,

func generateCurrentTimeStamp () -> String {
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy_MM_dd_hh_mm_ss"
    return (formatter.string(from: Date()) as NSString) as String
}