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copied!<p>Not with the built-in <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date" rel="noreferrer"><code>Date</code> object</a>, as they're only aware of <strong><em>Local</em></strong> (as defined by the user's browser and/or OS settings) and <strong>UTC</strong>. You can see this from the many cloned methods the class has (e.g., <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date/getHours" rel="noreferrer"><code>getHours</code></a> / <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date/getUTCHours" rel="noreferrer"><code>getUTCHours</code></a>).</p> <p><a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date/getTimezoneOffset" rel="noreferrer"><code>getTimezoneOffset</code></a> is the only timezone info you really have, but it's <em>local</em> as well and will probably only give you <code>+0</code> again (or +6 in my case):</p> <pre><code>var date = new Date("2012-01-17T12:55:00.000+01:00"); console.log(date.getTimezoneOffset() / 60.0); </code></pre> <p>You can try <a href="https://github.com/mde/timezone-js" rel="noreferrer">timezone-js</a> (or <a href="https://github.com/mde/timezone-js/network" rel="noreferrer">one of its forks</a>), but you'll need to know the <a href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones" rel="noreferrer">Olson timezone name</a> not just the GMT/UTC offset:</p> <pre><code>var date = new new timezoneJS.Date('2012-01-17T12:55:00.000+01:00', 'Europe/Brussels'); alert(date.getTimezoneOffset() / 60.0); // +1 </code></pre>

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