Firebase: Store server timestamp when document created

Question

when I use this code :

firestore().collection("item").add({...item, created: firebase.database.ServerValue.TIMESTAMP})

It creates entry {".sv" : "timestamp"} <-- actual word "timestamp"

Answer 1

It looks like you're creating a document in Firestore, but trying to get a timestamp from the Realtime Database, which is a different Firebase Product.

Here's how to use Firestore's timestamp (Updated on Feb 2019):

firestore().collection("item")
 .add({...item, created: firebase.firestore.Timestamp.fromDate(new Date()) })

Answer 2

At the time of writing this, the accepted solution does not work. The expression firebase.firestore.FieldValue.serverTimestamp() is no longer valid. The Timestamp is now direcly inside firestore.

Thus, to get the current server time in seconds you can write

require('firebase-admin').firestore.Timestamp.now()._seconds

Answer 3

This solution worked for me (on March 2020):

Firestore.instance.collection("item").add({...other items, 'created': FieldValue.serverTimestamp()});

The result in Cloud Firestore is:

Cloud Firestore Result

Answer 4

I use the official suggestion as here below:

updateDoc(doc.ref, {
timestamp: serverTimestamp()
});