Selisih Tanggal

catatan :
buat fungsi tanggal sebagai berikut :
function SelisihTanggal(TglOld,TglNew: TDate): Integer;
begin
  Result:= Trunc(TglNew - TglOld);
end;
letakkan source code ini pada even onclik tombol hitung
  Edit1.Text:= IntToStr(SelisihTanggal(DateTimePicker1.Date, DateTimePicker2.Date));
letakkan source code ini pada even form create
DateTimePicker2.Date:= Now;

source code selengkapnya:
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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    DateTimePicker1: TDateTimePicker;
    DateTimePicker2: TDateTimePicker;
    Edit1: TEdit;
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function SelisihTanggal(TglOld,TglNew: TDate): Integer;
begin
  Result:= Trunc(TglNew - TglOld);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Edit1.Text:= IntToStr(SelisihTanggal(DateTimePicker1.Date, DateTimePicker2.Date));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  DateTimePicker2.Date:= Now;
end;

end.