Project Structure

• Datecomp.dpr
• DateF.pas
• DateF.dfm

program DateComp;

uses
  Forms,
  DateF in 'DateF.pas' {DateForm};

{$R *.RES}

begin
  Application.CreateForm(TDateForm, DateForm);
  Application.Run;
end.

unit DateF;

interface

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

type
  TDateForm = class(TForm)
    LabelDate: TLabel;
    BtnIncrease: TButton;
    BtnDecrease: TButton;
    BtnAdd10: TButton;
    BtnSubtract10: TButton;
    EditMonth: TEdit;
    EditDay: TEdit;
    EditYear: TEdit;
    ButtonRead: TButton;
    ButtonWrite: TButton;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Date1: TDate;
    procedure BtnIncreaseClick(Sender: TObject);
    procedure BtnDecreaseClick(Sender: TObject);
    procedure BtnAdd10Click(Sender: TObject);
    procedure BtnSubtract10Click(Sender: TObject);
    procedure ButtonReadClick(Sender: TObject);
    procedure ButtonWriteClick(Sender: TObject);
    procedure Date1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  DateForm: TDateForm;

implementation

{$R *.DFM}

procedure TDateForm.BtnIncreaseClick(Sender: TObject);
begin
  Date1.Increase;
end;

procedure TDateForm.BtnDecreaseClick(Sender: TObject);
begin
  Date1.Decrease;
end;

procedure TDateForm.BtnAdd10Click(Sender: TObject);
begin
  Date1.Increase (10);
end;

procedure TDateForm.BtnSubtract10Click(Sender: TObject);
begin
  Date1.Decrease (10);
end;

procedure TDateForm.ButtonReadClick(Sender: TObject);
begin
  EditYear.Text := IntToStr (Date1.Year);
  EditMonth.Text := IntToStr (Date1.Month);
  EditDay.Text := IntToStr (Date1.Day);
end;

procedure TDateForm.ButtonWriteClick(Sender: TObject);
begin
  Date1.SetValue (StrToInt (EditYear.Text),
    StrToInt (EditMonth.Text),
    StrToInt (EditDay.Text));
end;

procedure TDateForm.Date1Change(Sender: TObject);
begin
  LabelDate.Caption := Date1.Text;
end;

end.

object DateForm: TDateForm
  Left = 207
  Top = 114
  Width = 355
  Height = 243
  ActiveControl = BtnIncrease
  Caption = 'Dates'
  Color = clBtnFace
  Font.Charset = ANSI_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = True
  OnCreate = Date1Change
  PixelsPerInch = 96
  TextHeight = 13
  object LabelDate: TLabel
    Left = 0
    Top = 16
    Width = 313
    Height = 32
    Alignment = taCenter
    AutoSize = False
    Caption = 'date'
    Font.Charset = ANSI_CHARSET
    Font.Color = clBlack
    Font.Height = -27
    Font.Name = 'Arial'
    Font.Style = [fsBold]
    ParentFont = False
  end
  object Label1: TLabel
    Left = 169
    Top = 124
    Width = 30
    Height = 13
    Caption = 'Month'
  end
  object Label2: TLabel
    Left = 168
    Top = 156
    Width = 19
    Height = 13
    Caption = 'Day'
  end
  object Label3: TLabel
    Left = 169
    Top = 188
    Width = 22
    Height = 13
    Caption = 'Year'
  end
  object BtnIncrease: TButton
    Left = 8
    Top = 56
    Width = 73
    Height = 33
    Caption = '&Increase'
    TabOrder = 0
    OnClick = BtnIncreaseClick
  end
  object BtnDecrease: TButton
    Left = 168
    Top = 56
    Width = 81
    Height = 33
    Caption = '&Decrease'
    TabOrder = 1
    OnClick = BtnDecreaseClick
  end
  object BtnAdd10: TButton
    Left = 88
    Top = 56
    Width = 73
    Height = 33
    Caption = '&Add 10'
    TabOrder = 2
    OnClick = BtnAdd10Click
  end
  object BtnSubtract10: TButton
    Left = 256
    Top = 56
    Width = 81
    Height = 33
    Caption = '&Subtract 10'
    TabOrder = 3
    OnClick = BtnSubtract10Click
  end
  object EditMonth: TEdit
    Left = 208
    Top = 120
    Width = 121
    Height = 21
    TabOrder = 4
  end
  object EditDay: TEdit
    Left = 208
    Top = 152
    Width = 121
    Height = 21
    TabOrder = 5
  end
  object EditYear: TEdit
    Left = 208
    Top = 184
    Width = 121
    Height = 21
    TabOrder = 6
  end
  object ButtonRead: TButton
    Left = 40
    Top = 128
    Width = 75
    Height = 25
    Caption = '&Read'
    TabOrder = 7
    OnClick = ButtonReadClick
  end
  object ButtonWrite: TButton
    Left = 40
    Top = 168
    Width = 75
    Height = 25
    Caption = '&Write'
    TabOrder = 8
    OnClick = ButtonWriteClick
  end
  object Date1: TDate
    Day = 16
    Month = 10
    Year = 2001
    OnChange = Date1Change
    Left = 16
    Top = 8
  end
end