Update a Firestore document Timestamp

Update a Firestore document Timestamp

Explore further

For detailed documentation that includes this code sample, see the following:

• Add and update data
• Add data to Cloud Firestore

Code sample

C#

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

DocumentReference cityRef = db.Collection("cities").Document("new-city-id");
await cityRef.UpdateAsync("Timestamp", Timestamp.GetCurrentTimestamp());

Go

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"log"

	"cloud.google.com/go/firestore"
)

func updateDocServerTimestamp(ctx context.Context, client *firestore.Client) error {
	// ...

	_, err := client.Collection("objects").Doc("some-id").Set(ctx, map[string]interface{}{
		"timestamp": firestore.ServerTimestamp,
	}, firestore.MergeAll)
	if err != nil {
		// Handle any errors in an appropriate way, such as returning them.
		log.Printf("An error has occurred: %s", err)
	}

	return err
}

Java

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

DocumentReference docRef = db.collection("objects").document("some-id");
// Update the timestamp field with the value from the server
ApiFuture<WriteResult> writeResult = docRef.update("timestamp", FieldValue.serverTimestamp());
System.out.println("Update time : " + writeResult.get());

Node.js

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

// Create a document reference
const docRef = db.collection('objects').doc('some-id');

// Update the timestamp field with the value from the server
const res = await docRef.update({
  timestamp: FieldValue.serverTimestamp()
});

PHP

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

$docRef = $db->collection('samples/php/objects')->document('some-id');
$docRef->update([
    ['path' => 'timestamp', 'value' => FieldValue::serverTimestamp()]
]);

Python

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

city_ref = db.collection("objects").document("some-id")
city_ref.update({"timestamp": firestore.SERVER_TIMESTAMP})

Ruby

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

city_ref = firestore.doc "#{collection_path}/new-city-id"
city_ref.update({ timestamp: firestore.field_server_time })

What's next

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