files/en-us/web/api/notification/timestamp/index.md
{{APIRef("Web Notifications")}}{{SecureContext_Header}}{{SeeCompatTable}} {{AvailableInWorkers}}
The timestamp read-only property of the
{{domxref("Notification")}} interface returns a number, as
specified in the timestamp option of the
{{domxref("Notification.Notification","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 {{Glossary("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(Date.now());
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
{{Specifications}}
{{Compat}}