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    <p>I dont think there is any built-in function for this, however it would not be complicated to achieve what you want.</p> <p><a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date" rel="nofollow">https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date</a></p> <p>First, create a date with 0 elapsed milliseconds:</p> <pre><code>var d = new Date(0); </code></pre> <p>Parse your time string and set the hours of the date accordingly:</p> <pre><code>var t = timeString.match(/(\d{1,2}):(\d{2}) ([AP]M)/), h = parseInt(t[1], 10), isAm = t[3] === 'AM', isMidnight = h === 12 &amp;&amp; isAm, isNoon = h === 12 &amp;&amp; !isAm; d.setUTCHours(isMidnight? 0 : h + (isAm || isNoon? 0 : 12), parseInt(t[2], 10)); </code></pre> <p>Use the <code>getTime</code> function to get the milliseconds:</p> <pre><code>console.log(d.getTime()); //10800000 </code></pre> <p>Here's a re-usable function:</p> <pre><code>function getTimeMilliseconds(timeString) { var t = timeString.match(/(\d{1,2}):(\d{2}) ([AP]M)/), h = parseInt(t[1], 10), isAm = t[3] === 'AM', isMidnight = h === 12 &amp;&amp; isAm, isNoon = h === 12 &amp;&amp; !isAm; return new Date(0).setUTCHours(isMidnight? 0 : h + (isAm || isNoon? 0 : 12), parseInt(t[2], 10)); } getTimeMilliseconds('3:00 AM'); </code></pre> <p><em>Note that you don't really need the <code>Date</code> object to achieve this, but I use it because it does the math for you, however you could always do <code>hours * 3600000 + minutes * 60000</code>.</em></p> <pre><code>function getTimeMilliseconds(timeString) { var t = timeString.match(/(\d{1,2}):(\d{2}) ([AP]M)/), h = parseInt(t[1], 10), isAm = t[3] === 'AM', isMidnight = h === 12 &amp;&amp; isAm, isNoon = h === 12 &amp;&amp; !isAm; return (isMidnight? 0 : h + (isAm || isNoon? 0 : 12)) * 3600000 + parseInt(t[2], 10) * 60000; } </code></pre>
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    1. POHow do I convert human readable hours into milliseconds using javascript?
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    1. POHow do I convert human readable hours into milliseconds using javascript?
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    1. CODoesn't work for `12:00 PM` (which should be 12 hours, but will be counted as 24.)
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    2. COHere's a fiddle demonstrating that: http://jsfiddle.net/qs3XZ/
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    3. CO@ColinDeClue, Thanks for the feedback, I fixed it.
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