ios - How to create negative Firebase timestamp in swift

Question

For an iOS app I am working on, I need to fetch messages in descending order i.e the latest message comes first, followed by second newest message etc.

From looking at other SO answers and research it seems that the best approach for my situation is to create a negative timestamp and then persist that to the database as an extra property to messages.

I will then use queryOrderedByChild('negativeTimestamp') to fetch the messages in a observeSingleEvent and then have a childAdded observer to handle messages which are sent once initial calls are made.

In the firebase documentation it says I can get the server timestamp value from this snippet of code firebase.database.ServerValue.TIMESTAMP

How do I write this for Swift 3?

Answer 1

Waitting for answers