<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -",
    "watchOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "Dispatch",
  "identifier" : "/documentation/Dispatch/dispatch_time_t",
  "metadataVersion" : "0.1.0",
  "role" : "Type Alias",
  "symbol" : {
    "kind" : "Type Alias",
    "modules" : [
      "Dispatch"
    ],
    "preciseIdentifier" : "c:@T@dispatch_time_t"
  },
  "title" : "dispatch_time_t"
}
-->

# dispatch_time_t

An abstract representation of time.

```
typealias dispatch_time_t = UInt64
```

## Topics

### Well-Defined Times

[`DISPATCH_TIME_NOW`](/documentation/Dispatch/DISPATCH_TIME_NOW)

[`DISPATCH_TIME_FOREVER`](/documentation/Dispatch/DISPATCH_TIME_FOREVER)

### Time Multiplier Constants

[`USEC_PER_SEC`](/documentation/Dispatch/USEC_PER_SEC)

[`NSEC_PER_SEC`](/documentation/Dispatch/NSEC_PER_SEC)

[`NSEC_PER_MSEC`](/documentation/Dispatch/NSEC_PER_MSEC)

[`NSEC_PER_USEC`](/documentation/Dispatch/NSEC_PER_USEC)


---

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)