<!--
{
  "availability" : [
    "DriverKit: 27.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "VideoDriverKit",
  "identifier" : "/documentation/VideoDriverKit/IOUserVideoClockDevice/UpdateCurrentZeroTimestamp",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "VideoDriverKit"
    ],
    "preciseIdentifier" : "c:@S@IOUserVideoClockDevice@F@UpdateCurrentZeroTimestamp#k#k#"
  },
  "title" : "UpdateCurrentZeroTimestamp"
}
-->

# UpdateCurrentZeroTimestamp

Update the current timestamp value.

```
void UpdateCurrentZeroTimestamp(uint64_t in_sample_time, uint64_t in_host_time);
```

## Parameters

`in_sample_time`

uint64_t the most current sample time being tracked by the hardware device.

`in_host_time`

uint64_t the most current host time being tracked by the hardware device.

## Discussion

Updating the current timestamp should use the time passed in the hardware interrupt.

---

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)