Pascal (Lazarus/Delphi)

Get Current Date/Time from NIST Time Server

See more Socket/SSL/TLS Examples

Demonstrates using Chilkat Socket to connect to an NIST time server and (using the old Time Protocol (RFC 868)), will read the current GMT time.

Note: This is not necessarily the very best means for getting the current date/time. The most commonly used time protocol is the Network Time Protocol (RFC-1305).

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.CkDateTime,
  Chilkat.Socket;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  maxWaitMs: Integer;
  useTls: Boolean;
  bigEndian: Boolean;
  dt: TCkDateTime;
  bLocalTime: Boolean;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  socket := TSocket.Create;

  //  Connect to an NIST time server and read the current date/time
  maxWaitMs := 4000;
  useTls := False;
  success := socket.Connect('time-c.nist.gov',37,useTls,maxWaitMs);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  The time server will send a big-endian 32-bit integer representing
  //  the number of seconds since since 00:00 (midnight) 1 January 1900 GMT.
  //  The ReceiveInt32 method will receive a 4-byte integer, but returns
  //  True or False to indicate success.  If successful, the integer
  //  is obtained via the ReceivedInt property.
  bigEndian := True;
  success := socket.ReceiveInt32(bigEndian);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  dt := TCkDateTime.Create;
  dt.SetFromNtpTime(socket.ReceivedInt);

  //  Show the current local date/time
  bLocalTime := True;
  WriteLn('Current local date/time: ' + dt.GetAsRfc822(bLocalTime));

  maxWaitMs := 10;
  socket.Close(maxWaitMs);


  socket.Free;
  dt.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.