<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -",
    "watchOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreFoundation",
  "identifier" : "/documentation/CoreFoundation/CFTimeZoneCopyAbbreviation(_:_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Function",
  "symbol" : {
    "kind" : "Function",
    "modules" : [
      "Core Foundation"
    ],
    "preciseIdentifier" : "c:@F@CFTimeZoneCopyAbbreviation"
  },
  "title" : "CFTimeZoneCopyAbbreviation(_:_:)"
}
-->

# CFTimeZoneCopyAbbreviation(_:_:)

Returns the abbreviation of a time zone at a specified date.

```
func CFTimeZoneCopyAbbreviation(_ tz: CFTimeZone!, _ at: CFAbsoluteTime) -> CFString!
```

## Parameters

`tz`

The time zone to use.

`at`

The absolute time at which to obtain the abbreviation.

## Return Value

A string containing the time zone abbreviation of `at`. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029).

## Discussion

Note that the abbreviation may be different at different dates. For example, during daylight savings time the US/Eastern time zone has an abbreviation of “EDT.” At other times, its abbreviation is “EST.”

---

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)