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    <p>By using the <a href="http://www.w3schools.com/jsref/jsref_obj_date.asp" rel="noreferrer">Date</a> object and its milliseconds value, differences can be calculated:</p> <pre class="lang-javascript prettyprint-override"><code>var a = new Date(); // Current date now. var b = new Date(2010, 0, 1, 0, 0, 0, 0); // Start of 2010. var d = (b-a); // Difference in milliseconds. </code></pre> <p>You can get the number of seconds (as a integer/whole number) by dividing the milliseconds by 1000 to convert it to seconds then converting the result to an integer (this removes the fractional part representing the milliseconds):</p> <pre class="lang-javascript prettyprint-override"><code>var seconds = parseInt((b-a)/1000); </code></pre> <p>You could then get whole <code>minutes</code> by dividing <code>seconds</code> by 60 and converting it to an integer, then <code>hours</code> by dividing <code>minutes</code> by 60 and converting it to an integer, then longer time units in the same way. From this, a function to get the maximum whole amount of a time unit in the value of a lower unit and the remainder lower unit can be created:</p> <pre class="lang-javascript prettyprint-override"><code>function get_whole_values(base_value, time_fractions) { time_data = [base_value]; for (i = 0; i &lt; time_fractions.length; i++) { time_data.push(parseInt(time_data[i]/time_fractions[i])); time_data[i] = time_data[i] % time_fractions[i]; }; return time_data; }; // Input parameters below: base value of 72000 milliseconds, time fractions are // 1000 (amount of milliseconds in a second) and 60 (amount of seconds in a minute). console.log(get_whole_values(72000, [1000, 60])); // -&gt; [0,12,1] # 0 whole milliseconds, 12 whole seconds, 1 whole minute. </code></pre> <p>If you're wondering what the input parameters provided above for the second <a href="http://www.w3schools.com/jsref/jsref_obj_date.asp" rel="noreferrer">Date object</a> are, see their names below:</p> <pre class="lang-javascript prettyprint-override"><code>new Date(&lt;year&gt;, &lt;month&gt;, &lt;day&gt;, &lt;hours&gt;, &lt;minutes&gt;, &lt;seconds&gt;, &lt;milliseconds&gt;); </code></pre> <p>As noted in the comments of this solution, you don't necessarily need to provide all these values unless they're necessary for the date you wish to represent.</p>
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    1. COYou don't need to call the `Date` constructor with all the arguments, you can call it only with Year and Month, the other arguments are optional.
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    2. COThanks, CMS. I wanted to be sure the user understood that they can get very granular with their specification.
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    3. COI've updated the solution to communicate your point, CMS. I appreciate the heads-up.
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