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    <p>If you can accept lightweight code, i.e. without using the jQuery countdown timer, the following might help you:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;script type="text/javascript" src="http://localhost/web/JavaScript/jQuery/jquery"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; 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 &gt;= 3600) {/* do something when countup is reached*/} displayTime(); } function format(s) {return s&lt;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(); } ); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="timeContainer"&gt;&lt;/div&gt; &lt;button id="playStop"&gt;Play/Stop&lt;/button&gt; &lt;button id="addMin"&gt;+1 minute&lt;/button&gt; &lt;button id="subMin"&gt;-1 minute&lt;/button&gt; &lt;button id="addSec"&gt;+1 second&lt;/button&gt; &lt;button id="subSec"&gt;-1 second&lt;/button&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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