afx_msg void OnTimeChange( );
Remarks
The framework calls this member function after the system time is changed.
Have any application that changes the system time 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 Windows function with its hwnd parameter set to HWND_BROADCAST.
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See Also ::SendMessage, WM_TIMECHANGE