How to convert the Firebase ServerValue.timestamp() to date or to millisecond using swift 4

Question

Here, I want to convert the timestamp to millisecond but was unable to convert. Please help.

Answer 1

Finally, I found the answer

Step 1: Add the Object Mapper Pod dependency

Step 2: Create a FirebaseDateTransform class with type TransformType and override the function transformFromJSON(...)

//  Created by Bipin on 9/26/18.
//  Copyright © 2018 profyl.org. All rights reserved.
//

import Foundation
import ObjectMapper
import Firebase

enum FirebaseDate {
    case date(Date)
    case serverTimestamp

    var date: Date {
        switch self {
        case .date(let date):
            return date
        case .serverTimestamp:
            return Date()
        }
    }
}

class FirebaseDateTransform: TransformType {
    public typealias Object = FirebaseDate
    public typealias JSON = Any

    open func transformFromJSON(_ value: Any?) -> FirebaseDate? {
        switch value {
        case is [AnyHashable: Any]?:
            return .serverTimestamp
        default:
            return nil
        }
    }

    open func transformToJSON(_ value: FirebaseDate?) -> Any? {
        switch value {
        case .serverTimestamp?:
            return ServerValue.timestamp()
        default:
            return nil
        }
    }


    open func getFirebaseTimestamp()->String{

        return String(transformFromJSON(ServerValue.timestamp())!.date.toMillis())

    }
}

Step 3: Extension to convert date to millisecond.

extension Date {
    func toMillis() -> Int64! {
        return Int64(self.timeIntervalSince1970 * 1000)
    }
}