覆盖PrepareDisplayValue方法即可完成此任务

unit Unit4;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, cxGraphics, cxControls, cxLookAndFeels, cxLookAndFeelPainters,

  cxContainer, cxEdit, cxTextEdit, cxMaskEdit, cxSpinEdit, cxTimeEdit, StdCtrls;

type

  TMycxTimeEdit = class(TcxTimeEdit)

  protected

    procedure PrepareDisplayValue(const AEditValue: TcxEditValue; var DisplayValue: TcxEditValue; AEditFocused: Boolean); override;

  end;

  TcxTimeEdit = class(TMycxTimeEdit);

  TForm4 = class(TForm)

    cxTimeEdit1: TcxTimeEdit;

    Edit1: TEdit;

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form4: TForm4;

implementation

{$R *.dfm}

{ TMycxTimeEdit }

procedure TMycxTimeEdit.PrepareDisplayValue(const AEditValue: TcxEditValue;

  var DisplayValue: TcxEditValue; AEditFocused: Boolean);

begin

  inherited;

  if not AEditFocused then

    DisplayValue := DisplayValue + ' CET';

end;

end.