<!--
{
  "availability" : [
    "iOS: 14.5.0 -",
    "iPadOS: 14.5.0 -",
    "macCatalyst: 14.5.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "StoreKit",
  "identifier" : "/documentation/StoreKit/SKAdImpression/timestamp",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "StoreKit"
    ],
    "preciseIdentifier" : "c:objc(cs)SKAdImpression(py)timestamp"
  },
  "title" : "timestamp"
}
-->

# timestamp

A number that represents the UNIX time, in milliseconds, of the ad impression.

```
var timestamp: NSNumber { get set }
```

## Discussion

Ad networks generate the timestamp, represented as UNIX time in milliseconds, at the time you begin to serve the ad to users.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)