---
title: systemTimeZoneDidChange
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/notificationcenter/messageidentifier/systemtimezonedidchange
---

# systemTimeZoneDidChange

An identifier for a message about a change in the system time zone.

## Declaration

```swift
static var systemTimeZoneDidChange: NotificationCenter.BaseMessageIdentifier<TimeZone.SystemTimeZoneDidChangeMessage> { get }
```

## Discussion

Discussion Use this identifier with NotificationCenter’s addObserver(of:for:using:) or messages(of:for:bufferSize:) methods to observe messages of type TimeZone.SystemTimeZoneDidChangeMessage.

## See Also

### Identifying calendar, date, and time zone messages

- [calendarDayChanged](foundation/notificationcenter/messageidentifier/calendardaychanged.md)
- [systemClockDidChange](foundation/notificationcenter/messageidentifier/systemclockdidchange.md)