I have tried many ways, but I still can't convert the timestamp to date (year month day..), now I have this problem，

problem appear Value of type 'Int' has no member 'seconds'

let date = Date(timeIntervalSince1970: timestamp.seconds)

Here is the complete code

func getDatas(){
        let firestoreDB = Firestore.firestore()
        
        firestoreDB.collection("Post").order(by: "date", descending: true).addSnapshotListener { snapshot, error in
            if error != nil {
                print(error?.localizedDescription ?? "Error while getting data from server!" )
            }else{
                if snapshot?.isEmpty != true && snapshot != nil {
                    self.postArray.removeAll(keepingCapacity: false)
                    for document in snapshot!.documents{
                        if let imageURL = document.get("imageUrl") as? String{
                            if let caption = document.get("caption") as? String{
                                if let email = document.get("email") as? String{
                                    if let timestamp = document.get("timestamp") as? Int{
                                        let date = Date(timeIntervalSince1970: timestamp.seconds)
                                        let post = Post(email: email, caption: caption, imageUrl: imageURL, timestamp: timestamp)
                                    self.postArray.append(post)
                                        
                                    }
                                }
                            }
                        }
                    }
                    self.tableView.reloadData()
                }
            }
        }

CodePudding user response：

You have converted something from a network response into an Int. You have then called <int>.seconds. The error message is telling you that there is no such thing as .seconds on an Int.

The timestamp that the Date class is expecting is simply a Double. You can use either the keyboard "Double" or "TimeInterval". Instead of casting as an Int, just do this:

if let timestamp = document.get("timestamp") as? TimeInterval {
    let date = Date(timeIntervalSince1970: timestamp)

CodePudding user response：

Timestamp is just an int (number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z)). So doesn't have a seconds property. Have you tried: let date = Date(timeIntervalSince1970: timestamp) ???