從TimeServer獲取TIme

Question

我想從NIST時間服務器獲取時間。我怎樣才能做到這一點。我可以用任何語言，但我更喜歡PHP

Answer 1

<?php 
/* Query a time server 
    (C) 1999-09-29, Ralf D. Kloth (QRQ.software) <ralf at qrq.de> */ 
$timeserver = "ntp1.sf-bay.org"; 
$timercvd = query_time_server($timeserver,37); 
if (!$timercvd[1]) { # if no error from query_time_server 
    $timevalue = bin2hex ($timercvd[0]); 
    $timevalue = abs (HexDec('7fffffff') - HexDec($timevalue) - HexDec('7fffffff')) ; 
    $tmestamp = $timevalue - 2208988800; # convert to UNIX epoch time stamp 
    $datum = date("Y-m-d (D) H:i:s",$tmestamp - date("Z",$tmestamp)); /* incl time zone offset */ 
    $doy = (date("z",$tmestamp)+1); 

    echo "Time check from time server ",$timeserver," : [<font color=\"red\">",$timevalue,"</font>]"; 
    echo " (seconds since 1900-01-01 00:00.00).<br>\n"; 
    echo "The current date and universal time is ",$datum," UTC. "; 
    echo "It is day ",$doy," of this year.<br>\n"; 
    echo "The unix epoch time stamp is $tmestamp.<br>\n"; 
} #if (!$timercvd) 
else { 
    echo "Unfortunately, the time server $timeserver could not be reached at this time. "; 
    echo "$timercvd[1] $timercvd[2].<br>\n"; 
} # else 
?> 

source

Answer 2

完整的答案與真正的代碼（混合的代碼匹配的誕生和kloth）：

function query_time_server ($ntpserver, $socket) { 
/* Query a time server 
    (C) 1999-09-29, Ralf D. Kloth (QRQ.software) <ralf at qrq.de> */ 

    // parameters: server, socket, error code, error text, timeout 
    $fp = fsockopen($ntpserver,$socket,$err,$errstr,3); 

    if ($fp) { 
     fputs($fp,"\n"); 
     $timevalue = fread($fp,49); 
     fclose($fp); 
    } else { 
     $timevalue = " "; 
    } 

    $ret = array(); 
    $ret[] = $timevalue; 
    $ret[] = $err;  # error code 
    $ret[] = $errstr; # error text 
    return($ret); 
} 
$got_time = false; 
$servers = array(

    'ntp.pads.ufrj.br', 
    'ntp2.pads.ufrj.br', 
    'ntp3.pads.ufrj.br', 
    'time.nist.gov', 
    'ntp.on.br', 
    'ntp2.on.br' 
); 


try { 
    foreach ($servers as $ntpserver) { 
     echo "</br>".$ntpserver."</br>"; 

      $fp = @fsockopen($ntpserver, 37, $errno, $errstr, 2); 
     if (!$fp) { 
      // offline or connection refused, try next 
      echo $ntpserver." is offline or connection refused, try next.</br>"; 
      //continue; 
     } else { 

      $data = ''; 
      while (!feof($fp)) { 
       $data .= fgets($fp, 4); 
      } 
      fclose($fp); 

      if (strlen($data) == 4) { 
       $got_time = true; 
       $time1900 = hexdec(bin2hex($data)); 
       $timestamp = $time1900 - 2208988800; // Time server is based on 1900 while Unix is based on 1970 

       //break; 
      } else { 
       $timestamp = "NO RESULT"; 
      } 
      echo $ntpserver." port 37 is ONLINE connection accepted, with result: ".$timestamp."</br>"; 

     } 



     //$ntpserver = "ntp.pads.ufrj.br"; 

     $timercvd = query_time_server($ntpserver,13); 
     //if ($timercvd[1] > "") { echo "urubu patata";} 

     if (!$timercvd[1]) { // if no error from query_time_server 
      $timevalue = $timercvd[0]; 
      echo "Time check from time server ".$ntpserver." on port 13 : <font color='red'>".$timevalue."</font></br>"; 
      //echo "Time check from time server ".$ntpserver." : [<font color=\"red\">".$timevalue."</font>].<br>\n"; 
     } else { 
      echo "Unfortunately, the time server $ntpserver could not be reached at this time on port 13. </br>"; 
      echo "$timercvd[1] $timercvd[2].<br>\n"; 
     } //*/ 
    } 
} catch (Exception $e) { 
    echo "Exceção pega2: ", $e->getMessage(), "\n"; 
} ?>