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    <p>The way to query a network machine for it's system time is <a href="http://msdn.microsoft.com/en-us/library/aa370612(VS.85).aspx" rel="nofollow noreferrer">NetRemoteTOD</a>.</p> <p>Here's code to do it in Delphi (a usage example is posted below).</p> <p>Since it relies on Windows API calls, it shouldn't be too different in C#.</p> <pre><code>unit TimeHandler; interface type TTimeHandler = class private FServerName : widestring; public constructor Create(servername : widestring); function RemoteSystemTime : TDateTime; procedure SetLocalSystemTime(settotime : TDateTime); end; implementation uses Windows, SysUtils, Messages; function NetRemoteTOD(ServerName :PWideChar; var buffer :pointer) : integer; stdcall; external 'netapi32.dll'; function NetApiBufferFree(buffer : Pointer) : integer; stdcall; external 'netapi32.dll'; type //See MSDN documentation on the TIME_OF_DAY_INFO structure. PTime_Of_Day_Info = ^TTime_Of_Day_Info; TTime_Of_Day_Info = record ElapsedDate : integer; Milliseconds : integer; Hours : integer; Minutes : integer; Seconds : integer; HundredthsOfSeconds : integer; TimeZone : LongInt; TimeInterval : integer; Day : integer; Month : integer; Year : integer; DayOfWeek : integer; end; constructor TTimeHandler.Create(servername: widestring); begin inherited Create; FServerName := servername; end; function TTimeHandler.RemoteSystemTime: TDateTime; var Buffer : pointer; Rek : PTime_Of_Day_Info; DateOnly, TimeOnly : TDateTime; timezone : integer; begin //if the call is successful... if 0 = NetRemoteTOD(PWideChar(FServerName),Buffer) then begin //store the time of day info in our special buffer structure Rek := PTime_Of_Day_Info(Buffer); //windows time is in GMT, so we adjust for our current time zone if Rek.TimeZone &lt;&gt; -1 then timezone := Rek.TimeZone div 60 else timezone := 0; //decode the date from integers into TDateTimes //assume zero milliseconds try DateOnly := EncodeDate(Rek.Year,Rek.Month,Rek.Day); TimeOnly := EncodeTime(Rek.Hours,Rek.Minutes,Rek.Seconds,0); except on e : exception do raise Exception.Create( 'Date retrieved from server, but it was invalid!' + #13#10 + e.Message ); end; //translate the time into a TDateTime //apply any time zone adjustment and return the result Result := DateOnly + TimeOnly - (timezone / 24); end //if call was successful else begin raise Exception.Create('Time retrieval failed from "'+FServerName+'"'); end; //free the data structure we created NetApiBufferFree(Buffer); end; procedure TTimeHandler.SetLocalSystemTime(settotime: TDateTime); var SystemTime : TSystemTime; begin DateTimeToSystemTime(settotime,SystemTime); SetLocalTime(SystemTime); //tell windows that the time changed PostMessage(HWND_BROADCAST,WM_TIMECHANGE,0,0); end; </code></pre> <p>And here is the usage example:</p> <pre><code>procedure TfrmMain.SynchLocalTimeWithServer; var tod : TTimeHandler; begin tod := TTimeHandler.Create(cboServerName.Text); try tod.SetLocalSystemTime(tod.RemoteSystemTime); finally FreeAndNil(tod); end; //try-finally end; </code></pre>
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