如何获取系统时间，如何获取系统日期？

var
 ADate:TDateTime;
 ss:string;
 week:array[1..7]of  string;
 begin
   week[1]:='星期天';
   week[2]:='星期一';
   week[3]:='星期二';
   week[4]:='星期三';
   week[5]:='星期四';
   week[6]:='星期五';
   week[7]:='星期六';
   ADate:=strtodate(FormatDateTime('yyyy-mm-dd',now));
   ss:=FormatDateTime('yyyy"年"m"月"d"日"hh:nn:ss',now);
   Edit1.Text:='当前日期：'+ss+#0+week[DayOfWeek(ADate)];
 end;

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Button1: TButton;
    Button2: TButton;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
 Timer1.Enabled:=true;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
 Timer1.Enabled:=false;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
 var
    DateTime : TDateTime;
     Year, Month, Day, Hour, Min, Sec, MSec: Word;
  begin
   DateTime:= Now;
   DecodeDate(DateTime, Year, Month, Day);
   Label1.Caption:='Year: '+Inttostr(Year);
   Label2.Caption:='Month: '+Inttostr(Month);
   Label3.Caption:='Day: '+Inttostr(Day);
   DecodeTime(DateTime, Hour, Min, Sec, MSec);
   Label4.Caption:='Hour: '+Inttostr(Hour);
   Label5.Caption:='Min: '+Inttostr(Min);
   Label6.Caption:='Sec: '+Inttostr(Sec);
   Label7.Caption:='MSec: '+Inttostr(Msec)
end;

end.

谢谢了！

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Button1: TButton;
    Button2: TButton;
    Timer1: TTimer;
  
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);
begin
Timer1.Enabled:=true;

end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Timer1.Enabled:=false;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
    DateTime : TDateTime;
     Year, Month, Day, Hour, Min, Sec, MSec: Word;
  begin
   DateTime:= Now;
   DecodeDate(DateTime, Year, Month, Day);
   Label1.Caption:='Year: '+Inttostr(Year);
   Label2.Caption:='Month: '+Inttostr(Month);
   Label3.Caption:='Day: '+Inttostr(Day);
   DecodeTime(DateTime, Hour, Min, Sec, MSec);
   Label4.Caption:='Hour: '+Inttostr(Hour);
   Label5.Caption:='Min: '+Inttostr(Min);
   Label6.Caption:='Sec: '+Inttostr(Sec);
   Label7.Caption:='MSec: '+Inttostr(Msec);


end;

procedure TForm1.FormCreate(Sender: TObject);
begin

end;

end.