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How to detect if the system time has been changed

Title: How to detect if the system time has been changed type TForm1 = class(TForm) private procedure WMTimeChange(var Msg: TMessage); message WM_TIMECHANGE; end; var Form1: TForm1; implementation {$R *.DFM} procedure TForm1.WMTimeChange(var Msg: TMessage); begin inherited; ShowMessage('Date/Time has changed!'); // Datum/Zeit wurde ge?ndert! end;