---
name: "up.Response.prototype.lastModified"
area: "API"
kind: "Property"
parent: "up.Response class"
url: "https://unpoly.com/api/up.Response.prototype.lastModified"
---
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# up.Response.prototype.lastModified

The last modification time of the response's underlying content.

This is extracted from the [`Last-Modified`](https://unpoly.com/api/Last-Modified.md) header sent by the server.

---

## Value {#value}

### lastModified {#lastModified}

Type: Date | undefined