# when

> Content position at which the seek takes effect. Null applies the seek immediately.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.Audio](/engine/6000.7/script-reference/unityengine/audio.md)
* **Assembly:** UnityEngine.AudioModule

```csharp
public DiscreteTime? when { get; }
```

### Remarks

An [AudioClip](/engine/6000.7/script-reference/unityengine/audioclip.md) generator applies seeks in send order, and drops a seek with a warning when playback has already passed its position by the time that seek becomes the next one due. A custom generator defines its own seek handling. For the full scheduling rules, refer to [SeekMessage](/engine/6000.7/script-reference/unityengine/audio/seekmessage.md).