Yesterday、Today、Tomorrow

interface

uses
　 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　 Dialogs;

type
　 TForm1 = class(TForm)
　　　 procedure FormCreate(Sender: TObject);
　 end;

var
　 Form1: TForm1;

implementation

{$R *.dfm}

uses DateUtils;

procedure TForm1.FormCreate(Sender: TObject);
var
　 t1,t2,t3: TDateTime;
begin
　 t1 := Yesterday;
　 t2 := Today;　　　　 //同 SysUtils.Date;
　 t3 := Tomorrow;

　 ShowMessageFmt('%s, %s, %s', [DateToStr(t1), DateToStr(t2), DateToStr(t3)]);
　 {2009-5-20, 2009-5-21, 2009-5-22}
end;