PHP

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).

Chilkat2 PHP

<?php

use Chilkat2\DateTime;
use Chilkat2\Socket;

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

$socket = new Socket();

// Connect to an NIST time server and read the current date/time
$maxWaitMs = 4000;
$useTls = false;
try {
    $socket->Connect('time-c.nist.gov', 37, $useTls, $maxWaitMs);

    // 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;
    $socket->ReceiveInt32($bigEndian);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$dt = new DateTime();
$dt->SetFromNtpTime($socket->ReceivedInt);

// Show the current local date/time
$bLocalTime = true;
echo 'Current local date/time: ', $dt->GetAsRfc822($bLocalTime), "\n";

$maxWaitMs = 10;
$socket->Close($maxWaitMs);