delphi incday 运行显示错误！！求解？
本帖最后由 YYB 于 2013-3-16 22:47 编辑unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
btn1: TButton;
procedure btn1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.btn1Click(Sender: TObject);
var
myDate : TDateTime;
begin
// Set up our date just before the end of the year 2000
myDate := EncodeDate(2000, 12, 30);
ShowMessage('myDate = '+DateToStr(myDate));
// Add 10 days to this date
myDate := IncDay(myDate, 10);
ShowMessage('myDate + 10 days = '+DateToStr(myDate));
end;
end.
软件提示：[Error] Unit1.pas(35): Undeclared identifier: 'IncDay'
什么原因啊？好纠结啊？弄不懂，网上也查不到。
我在网上下载了一本DELPHI函数参考大全，为什么有些函数不能用啊，也是出现上述的问题？？谢谢了
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