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# CLKLaunchedTimelineEntryDateKey

A key that indicates the date when the system launched the complication.

```
let CLKLaunchedTimelineEntryDateKey: String
```

## Discussion

The value of this key is an <doc://com.apple.documentation/documentation/Foundation/NSDate> object. When the user taps your complication, ClockKit includes this key in the dictionary that it passes to the extension delegate’s <doc://com.apple.documentation/documentation/WatchKit/WKExtensionDelegate/handleUserActivity(_:)> method.

---

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