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copied!<p>If you can accept lightweight code, i.e. without using the jQuery countdown timer, the following might help you:</p> <pre><code><!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="http://localhost/web/JavaScript/jQuery/jquery"></script> <script type="text/javascript"> var countUpSeconds = 0; var interval = null; function displayTime() { $("#timeContainer").text(format(Math.floor(countUpSeconds/60))+":"+format(countUpSeconds%60)); } function playStop() { if(interval) {interval=window.clearInterval(interval);} else {interval = window.setInterval(countUp, 1000);} } function countUp() { ++countUpSeconds; if(countUpSeconds >= 3600) {/* do something when countup is reached*/} displayTime(); } function format(s) {return s<10 ? "0"+s : s;} $(function() { displayTime(); $("#playStop").on("click", function () { playStop(); } ); $("#addMin").on("click", function () { countUpSeconds += 60; displayTime(); } ); $("#subMin").on("click", function () { countUpSeconds = Math.max(0, countUpSeconds-60); displayTime(); } ); $("#addSec").on("click", function () { countUpSeconds += 1; displayTime(); } ); $("#subSec").on("click", function () { countUpSeconds = Math.max(0, countUpSeconds-1); displayTime(); } ); }); </script> </head> <body> <div id="timeContainer"></div> <button id="playStop">Play/Stop</button> <button id="addMin">+1 minute</button> <button id="subMin">-1 minute</button> <button id="addSec">+1 second</button> <button id="subSec">-1 second</button> </body> </html> </code></pre>

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