let timestamp = FirebaseServerValue.timestamp() let newData = ["sender":     "John", "timestamp": timestamp]
ref.childByAppendingPath("messages").childByAppendingPath(ref.authData.uid).setValue(newData)

handle = ref.observeEventType(.ChildChanged, withBlock: { (snapshot) in

    let text = snapshot.value["message"] as! String

    let sender = snapshot.value["sender"] as! String

    let timestamp = snapshot.value["timestamp"] as! NSTimeInterval

    let date = NSDate(timeIntervalSince1970: timestamp/1000)

    // TESTING DATE
    let dateFormatter = NSDateFormatter()

    dateFormatter.AMSymbol = "AM"

    dateFormatter.PMSymbol = "PM"

    dateFormatter.dateFormat = "hh:mm, MM'/'dd'/'YY"

    let dateString = dateFormatter.stringFromDate(date)

    print(dateString)

03:37, 02/14/16

02:35, 02/14/16