---
title: kAudioOutputUnitProperty_StartTime
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiooutputunitproperty_starttime
---

# kAudioOutputUnitProperty_StartTime

A write-only AudioOutputUnitStartAtTimeParams data structure valid on the audio unit global scope. When this property is set on an output unit, it will cause the next Start request (but no subsequent Starts) to use the AudioDeviceStartAtTime function, using the specified timestamp, passing false for inRequestedStartTimeIsInput.

## Declaration

```swift
var kAudioOutputUnitProperty_StartTime: AudioUnitPropertyID { get }
```

## See Also

### Properties

- [kAudioOutputUnitProperty_ChannelMap](audiotoolbox/kaudiooutputunitproperty_channelmap.md)
- [kAudioOutputUnitProperty_CurrentDevice](audiotoolbox/kaudiooutputunitproperty_currentdevice.md)
- [kAudioOutputUnitProperty_EnableIO](audiotoolbox/kaudiooutputunitproperty_enableio.md)
- [kAudioOutputUnitProperty_HasIO](audiotoolbox/kaudiooutputunitproperty_hasio.md)
- [kAudioOutputUnitProperty_SetInputCallback](audiotoolbox/kaudiooutputunitproperty_setinputcallback.md)
- [kAudioOutputUnitProperty_StartTimestampsAtZero](audiotoolbox/kaudiooutputunitproperty_starttimestampsatzero.md)
- [kAudioOutputUnitProperty_IsRunning](audiotoolbox/kaudiooutputunitproperty_isrunning.md)