---
title: knownTimeZoneIdentifiers
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/timezone/knowntimezoneidentifiers
---

# knownTimeZoneIdentifiers

Returns an array of strings listing the identifier of all the time zones known to the system.

## Declaration

```swift
static var knownTimeZoneIdentifiers: [String] { get }
```

## See Also

### Creating a Time Zone

- [init(secondsFromGMT:)](foundation/timezone/init(secondsfromgmt:).md)
- [abbreviationDictionary](foundation/timezone/abbreviationdictionary.md)