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Получить время с сервера точного времени.

nit frmMainU;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ScktComp, StdCtrls;
 
type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    ClientSocket1: TClientSocket;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ClientSocket1Disconnect(Sender: TObject;
      Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
function ntohl(const value: cardinal): cardinal;
asm
  mov edx, eax
  mov ecx, eax
  shl ecx, 16
  and eax, $0000ff00
  or eax, ecx
  mov ecx, edx
  shl eax, 8
  and ecx, $00ff0000
  shr edx, 16
  or ecx, edx
  shr ecx, 8
  or eax, ecx
end;
 
function TimeZoneBias: Double;
var
  ATimeZone: TTimeZoneInformation;
begin
  if (GetTimeZoneInformation(ATimeZone) = TIME_ZONE_ID_DAYLIGHT) then
  begin
    result := ATimeZone.Bias + ATimeZone.DaylightBias;
  end
  else
  begin
    result := ATimeZone.Bias + ATimeZone.StandardBias;
  end;
  Result := Result / 1440;
end;
 
function SecsToTime(ASecs: Cardinal): TDateTime;
const
  SECS_PER_DAY = 24 * 60 * 60;
  UNIX_OFFSET = 25569;
begin
  Result := ntohl(ASecs) / SECS_PER_DAY + encodedate(1900, 1, 1) - TimeZoneBias;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Clear;
  memo1.Lines.Add('Connecting to ' + ClientSocket1.Host + '...');
  ClientSocket1.Open;
end;
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  ClientSocket1.Host := 'time-A.timefreq.bldrdoc.gov';
  ClientSocket1.Port := 37;
end;
 
procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket);
var
  buf: Cardinal;
begin
  Socket.ReceiveBuf(buf, sizeof(buf));
  memo1.Lines.Add(#13#10 + '-----------------------');
  memo1.Lines.Add(formatdatetime('dd.mm.yyyy hh:nn:ss', SecsToTime(buf)));
  memo1.Lines.Add('-----------------------'#13#10);
end;
 
procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  memo1.Lines.Add('Connect');
end;
 
procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  memo1.Lines.Add('Disonnect');
end;