Convert timestamp from Firebase to readable date

If your line 10. shows compile-time error as Error: "Binary operator '/' cannot be applied to operands of type 'String' and 'Int'",

then your line 11. `print(orderDate)` would never be executed so prints correctly does not make sense.

How have you get the output? Please show actual code you get this.

["-LQYspEghK3KE27MlFNE": 1541421618601,

“-LQsYbhf-vl-NnRLTHhK”: 1541768379422,

“-LQYDWAKlzTrlTtO1Qiz”: 1541410526186,

“-LQsILjpNqKwLl9XBcQm”: 1541764115618]

And if it repesents something taken from `value?["Date"]`, the type would be `[String: Int]`, not `[Int: String]`.

In

self.orderDateHistoryArray += Array(orderDate.values).map{ Date(timeIntervalSince1970: TimeInterval($0/1000))} // This fails. Error: "Binary operator '/' cannot be applied to operands of type 'String' and 'Int'"

orderDate.values are String

Hence $0 is String as well

What are those Strings exactly ?

You should either:

- change the type of values in orderDate

- change $0 into Int($0)

I´m sorry for being unclear. The print statement is printong correctly when line 10 is commented out. And you where right. There was a typo error when you said: " And if it repesents something taken from `value?["Date"]`, the type would be `[String: Int]`, not `[Int: String]`."

So, I have made progress. Now the dates prints:

2018-11-09 11:48:35 +0000,

2018-11-05 09:35:26 +0000,

2018-11-09 12:59:39 +0000,

2018-11-05 12:40:18 +0000

This is correct with the current setup i guess, but I would like to have another format on the timeStamp.

Ideally: DD.MM.YY.

This is my best attempt so far:

(the error on line 17 is: "Cannot convert value of type '[Date]' to expected argument type 'Date'"

var orderDateHistoryArray = [Any]()

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
       
        let cell = tableView.dequeueReusableCell(withIdentifier: "OrderHistoryCell") as! OrderHistoryTableViewCell
       
        cell.orderHistoryDateLabel.text = "\(orderDateHistoryArray[indexPath.row])"
       
        return cell
  }    

func getOrderDates() {
 
        let uid = Auth.auth().currentUser!.uid
        let orderDateHistoryRef = Database.database().reference().child("users/\(uid)/Orders/")
       
        orderDateHistoryRef.observeSingleEvent(of: .value, with: { (snapshot) in
      
            let value = snapshot.value as? NSDictionary
            if  let orderDate = value?["Date"] as? [String:Int] {
             
                let dates = orderDate.values.map {Date(timeIntervalSince1970: TimeInterval ($0/1000)) }
                let formatter = DateFormatter()
                formatter.calendar = Calendar(identifier: .iso8601)
                formatter.locale = Locale(identifier: "en_US_POSIX")
                formatter.timeZone = TimeZone(secondsFromGMT: 0)
                formatter.dateFormat = "h:mma, MMMM d, yyyy"
                let readable = formatter.string(from: dates) //Error: Cannot convert value of type '[Date]' to expected argument type 'Date'
                self.orderDateHistoryArray = dates 
   
                print(dates)
            }
            self.tableView.reloadData()
            // ...
        }) { (error) in
            print(error.localizedDescription)
        }
    }
}

Seems you are very near to what you want.

As the error message is clearly showing, your updated line 17. is a code to convert a single `Date` to `String`.

Not to convert `[Date]`.

You can use `map` as in your line 11.

        let readableDates = dates.map {formatter.string(from: $0)}
        self.orderDateHistoryArray = readableDates