Add timestamp in Firestore documents

Question

I\'m newbie to Firestore. Firestore docs says...

Important: Unlike \"push IDs\" in the Firebase Realtime Database, Cloud Firestore au

Answer 1

For Firestore

ref.doc(key).set({
  created: firebase.firestore.FieldValue.serverTimestamp()
})

Answer 2

Use firestore Timestamp class, firebase.firestore.Timestamp.now().

Since firebase.firestore.FieldValue.serverTimestamp() does not work with add method from firestore. Reference

Answer 3

Try this one for Swift 4 Timestamp(date: Date())

let docData: [String: Any] = [
"stringExample": "Hello world!",
"booleanExample": true,
"numberExample": 3.14159265,
"dateExample": Timestamp(Date()),
"arrayExample": [5, true, "hello"],
"nullExample": NSNull(),
"objectExample": [
    "a": 5,
    "b": [
        "nested": "foo"
    ]
]
]
db.collection("data").document("one").setData(docData) { err in
if let err = err {
    print("Error writing document: \(err)")
} else {
    print("Document successfully written!")
}
}

Answer 4

Firestone method does not work. Use Timestamp from java.sql.Timestamp and don't cast to string.. Then firestone formats it properly. For example to mark a now() use:

val timestamp = Timestamp(System.currentTimeMillis())