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.NET Development
.NET Framework 3.5
SystemEvents Class
SystemEvents Events
 TimeChanged Event
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This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
SystemEvents..::.TimeChanged Event

Occurs when the user changes the time on the system clock.

Namespace:  Microsoft.Win32
Assembly:  System (in System.dll)
 Syntax
Visual Basic (Declaration) 
Public Shared Event TimeChanged As EventHandler
Visual Basic (Usage) 
Dim handler As EventHandler

AddHandler SystemEvents.TimeChanged, handler
C# 
public static event EventHandler TimeChanged
Visual C++ 
public:
static  event EventHandler^ TimeChanged {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}
JScript 
JScript does not support events.
 Exceptions
ExceptionCondition
InvalidOperationException

System event notifications are not supported under the current context. Server processes, for example, might not support global system event notifications.

ExternalException

The attempt to create a system events window thread did not succeed.
 Remarks
NoteNote:

This event is only raised if the message pump is running. In a Windows service, unless a hidden form is used or the message pump has been started manually, this event will not be raised. For a code example that shows how to handle system events by using a hidden form in a Windows service, see the SystemEvents class.

Caution noteCaution:

Because this is a static event, you must detach your event handlers when your application is disposed, or memory leaks will result.
 Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
 Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
 See Also

Reference

SystemEvents Class
SystemEvents Members
Microsoft.Win32 Namespace
Now
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Undocumented edge cases      Steve Campbell ... Noelle Mallory - MSFT   |   Edit   |   Show History

It is unclear from the docs whether this event is triggered for DST switchover (daylight savings time). I tested and it is.

Also not clear whether it occurs for console apps (do they have a message pump?). I tested that too, and it appears to work.

[Noelle Mallory - MSFT] Please post questions to the MSDN Forums at http://forums.microsoft.com/msdn. You will likely get a quicker response through the forum than through the Community Content.

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Three Times Event raised      vivekWaghmare   |   Edit   |   Show History

I Tried to run this on console app, it runs fine, only issue i found is that it fires three times. I changed System Time Zone, and by code got three calls. below is the code.

classProgram

{

staticvoid Main(string[] args)

{

Microsoft.Win32.

SystemEvents.TimeChanged += newEventHandler(SystemEvents_TimeChanged);

Console.ReadLine();

}

staticvoid SystemEvents_TimeChanged(object sender, EventArgs e)

{

Console.WriteLine("Time Zone Changed");

}

}

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