unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, Calendar, ExtCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    DateTimePicker2: TDateTimePicker;
    DateTimePicker1: TDateTimePicker;
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
    procedure DateTimePicker2Change(Sender: TObject);
    procedure DateTimePicker1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
    self.DateTimePicker1.Date:=Now;
    self.DateTimePicker2.Time:=Now;
end;

procedure TForm1.DateTimePicker2Change(Sender: TObject);
var
    MyTime:TSystemTime;
begin
    DateTimeToSystemTime(self.DateTimePicker2.Time,MyTime);
    Timer1.Enabled:=false;
    SetLocalTime(MyTime);
    Timer1.Enabled:=true;
end;

procedure TForm1.DateTimePicker1Change(Sender: TObject);
var
    MyDate:TSystemTime;
begin
    DateTimeToSystemTime(self.DateTimePicker1.Time,MyDate);
    Timer1.Enabled:=false;
    SetLocalTime(MyDate);
    Timer1.Enabled:=true;
end;

end.