CWnd::OnTimeChange
The framework calls this member function after the system time is changed.
afx_msg void OnTimeChange( );
Remarks
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.
Requirements
Header: afxwin.h