Notification: timestamp property

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is available in Web Workers.

The timestamp read-only property of the Notification interface returns a number, as specified in the timestamp option of the Notification() constructor.

The notification's timestamp can represent the time, in milliseconds since 00:00:00 UTC on 1 January 1970, of the event for which the notification was created, or it can be an arbitrary timestamp that you want associated with the notification. For example, a timestamp for an upcoming meeting could be set in the future, whereas a timestamp for a missed message could be set in the past.


A number representing a timestamp, given as Unix time in milliseconds.


The following snippet fires a notification; a simple options object is created, then the notification is fired using the Notification() constructor.

const dts = Math.floor(;

const options = {
  body: "Your code submission has received 3 new review comments.",
  timestamp: dts,

const n = new Notification("New review activity", options);

console.log(n.timestamp); // Logs the timestamp


Notifications API Standard
# dom-notification-timestamp

Browser compatibility

BCD tables only load in the browser

See also