# externalReferenceTime

> Reference time of the external clock the VideoPlayer uses to correct its drift.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.Video](/engine/6000.3/script-reference/unityengine/video.md)
* **Assembly:** UnityEngine.VideoModule

```csharp
public double externalReferenceTime { get; set; }
```

### Remarks

Only relevant when [VideoPlayer.timeReference](/engine/6000.3/script-reference/unityengine/video/videoplayer/timereference.md) is set to [VideoTimeReference.ExternalTime](/engine/6000.3/script-reference/unityengine/video/videotimereference/externaltime.md).