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WM_TIMECHANGE Overview  Group

An application sends the WM_TIMECHANGE message to all top-level windows after changing the system time.


wParam = 0; // not used, must be zero 

lParam = 0; // not used, must be zero 



This message has no parameters.

Return Values

An application should return zero if it processes this message.


An application that changes the system time should send this message to all top-level windows. To send the WM_TIMECHANGE message to all top-level windows, an application can use the SendMessage function with the hwnd parameter set to HWND_TOPMOST.

See Also


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