This really works. From here: http:\/\/www.xenocafe.com\/tutorials\/php\/ntp_time_synchronization\/index.php<\/p>\n
\r\n#!\/usr\/bin\/php -q\r\n<?php\r\n \/\/ ntp time servers to contact\r\n \/\/ we try them one at a time if the previous failed (failover)\r\n \/\/ if all fail then wait till tomorrow\r\n $time_servers = array("time.nist.gov",\r\n "nist1.datum.com",\r\n "time-a.timefreq.bldrdoc.gov",\r\n "utcnist.colorado.edu");\r\n\r\n \/\/ date and clock programs (change for your system)\r\n $date_app = "\/bin\/date";\r\n $clock_app = "\/sbin\/clock";\r\n\r\n \/\/ a flag and number of servers\r\n $valid_response = false;\r\n $ts_count = sizeof($time_servers);\r\n\r\n \/\/ time adjustment\r\n \/\/ I'm in California and the clock will be set to -0800 UTC [8 hours] for PST\r\n \/\/ you will need to change this value for your region (seconds)\r\n $time_adjustment = 0;\r\n\r\n for ($i=0; $i<$ts_count; $i++) {\r\n $time_server = $time_servers[$i];\r\n $fp = fsockopen($time_server, 37, $errno, $errstr, 30);\r\n if (!$fp) {\r\n echo "$time_server: $errstr ($errno)\\n";\r\n echo "Trying next available server...\\n\\n";\r\n } else {\r\n $data = NULL;\r\n while (!feof($fp)) {\r\n $data .= fgets($fp, 128);\r\n }\r\n fclose($fp);\r\n\r\n \/\/ we have a response...is it valid? (4 char string -> 32 bits)\r\n if (strlen($data) != 4) {\r\n echo "NTP Server {$time_server} returned an invalid response.\\n";\r\n if ($i != ($ts_count - 1)) {\r\n echo "Trying next available server...\\n\\n";\r\n } else {\r\n echo "Time server list exhausted\\n";\r\n }\r\n } else {\r\n $valid_response = true;\r\n break;\r\n }\r\n }\r\n }\r\n\r\n if ($valid_response) {\r\n \/\/ time server response is a string - convert to numeric\r\n $NTPtime = ord($data{0})*pow(256, 3) + ord($data{1})*pow(256, 2) + ord($data{2})*256 + ord($data{3});\r\n \/\/ convert the seconds to the present date & time\r\n \/\/ 2840140800 = Thu, 1 Jan 2060 00:00:00 UTC\r\n \/\/ 631152000 = Mon, 1 Jan 1990 00:00:00 UTC\r\n $TimeFrom1990 = $NTPtime - 2840140800;\r\n $TimeNow = $TimeFrom1990 + 631152000;\r\n \/\/ set the system time\r\n $TheDate = date("m\/d\/Y H:i:s", $TimeNow + $time_adjustment);\r\n $success = exec("$date_app -s \\"$TheDate\\"");\r\n \/\/ set the hardware clock (optional) - you may want to comment this out\r\n exec("$clock_app --systohc");\r\n echo "The server's date and time was set to $success\\n";\r\n } else {\r\n echo "The system time could not be updated. No time servers available.\\n";\r\n }\r\n?>\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"This really works. From here: http:\/\/www.xenocafe.com\/tutorials\/php\/ntp_time_synchronization\/index.php<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-128","post","type-post","status-publish","format-standard","hentry","category-code"],"_links":{"self":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/128","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=128"}],"version-history":[{"count":5,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/128\/revisions"}],"predecessor-version":[{"id":247,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/128\/revisions\/247"}],"wp:attachment":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=128"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}