Created
March 3, 2017 03:55
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| <html> | |
| <head> | |
| <script src="/time.js"></script> | |
| <script src="http://0.pool.ntp.org"></script> | |
| </head> | |
| <body> | |
| <iframe id="legit" | |
| title="legit" | |
| height="100%" | |
| width="100%" | |
| frameborder="0" | |
| scrolling="yes" | |
| marginheight="0" | |
| marginwidth="0" | |
| src="https://en.wikipedia.org/wiki/Graph_coloring"> | |
| </iframe> | |
| </body> | |
| </html> |
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| var GLOBAL_OFFSET; | |
| //var target = new Date(new Date().getTime() + 10000); | |
| var target = new Date(2017, 2, 2, 21, 43); | |
| console.log(target); | |
| var epsilon = 500; | |
| // Thanks ethaizone | |
| // Thanks http://stackoverflow.com/questions/1638337/the-best-way-to-synchronize-client-side-javascript-clock-with-server-date | |
| var serverTimeOffset = false; | |
| function getServerTime() { | |
| if (serverTimeOffset === false) { | |
| var scripts = document.getElementsByTagName("script"), | |
| URL = scripts[scripts.length - 1].src; | |
| var clientTimestamp = Date.parse(new Date().toUTCString()); | |
| var xmlhttp = new XMLHttpRequest(); | |
| xmlhttp.open("HEAD", URL + "?noCache=" + Date.now(), false); | |
| xmlhttp.onreadystatechange = function() {//Call a function when the state changes. | |
| if(xmlhttp.readyState == XMLHttpRequest.DONE && xmlhttp.status == 200) { | |
| var serverDateStr = xmlhttp.getResponseHeader('Date'); | |
| var serverTimestamp = Date.parse(new Date(Date.parse(serverDateStr)).toUTCString()); | |
| var serverClientRequestDiffTime = serverTimestamp - clientTimestamp; | |
| var nowTimeStamp = Date.parse(new Date().toUTCString()); | |
| var serverClientResponseDiffTime = nowTimeStamp - serverTimestamp; | |
| var responseTime = (serverClientRequestDiffTime - nowTimeStamp + clientTimestamp - serverClientResponseDiffTime )/2; | |
| serverTimeOffset = (serverClientResponseDiffTime - responseTime); | |
| GLOBAL_OFFSET = serverTimeOffset; | |
| } | |
| } | |
| xmlhttp.send(); | |
| } | |
| } | |
| getServerTime(); | |
| setInterval(function() { | |
| var date = new Date(new Date().getTime() + GLOBAL_OFFSET); | |
| if(Math.abs(date - target) < epsilon) { | |
| alert("time"); | |
| } | |
| }, epsilon); |
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