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POCalculate time equivalent respective to a users time zone and a fixed time in PHP
 

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  1. POCalculate time equivalent respective to a users time zone and a fixed time in PHP
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    <p>Below is some text I am working on that tells users what time an online sale begins respective to their local time zone. The online sale always begins at 9am Pacific Time, <em>but not every day</em>.</p> <blockquote> <p>Our online sale begins at <strong>9am PDT</strong>. Your local time, based on your time zone setting, is <strong>September 11, 2012 - 12:02 am HST</strong>, which is UTC <strong>-10</strong> or <strong>3</strong> hours <strong>behind PDT</strong>. The sale will begin at <strong>XXam</strong> on local time.</p> </blockquote> <p>In the example above, the users time zone is Pacific/Honolulu and is stored in the db, and also set in a session called user_tz when they sign in.</p> <p>I have most of the variables calculated. I'm stuck on this part (The sale will begin at <strong>XXam</strong> on local time.) ...which is how to determine the local time equivalent of 9am Pacific Time, and whether the local time equivalent will be the <em>same day</em> or the <em>next day</em> depending on how far ahead of Pacific Time they are. For example, Melbourne Australia, the sale would begin, the next day, September 12 at 2:00am since Melbourne is 17 hours ahead of Pacific Time.</p> <p>"XX" should be 6:00 am in the example above.</p> <p>PHP Version 5.3.14</p> <pre><code>&lt;?php // gets the users time zone offset in seconds from UTC // shown above as -10 $user_tz_offset = getTimeZoneOffset($_SESSION['user_tz']); // gets the dst code of the timezone ...example: pdt or pst // shown above as HST $dateTime = new DateTime(); $dateTime-&gt;setTimeZone(new DateTimeZone($_SESSION['user_tz'])); $user_tz_dst = $dateTime-&gt;format('T'); // gets the difference in hours from Pacific time to the users time zone // shown above as 3 $hours_diff = abs(($user_tz_offset - TZ_OFFSET)/3600); // gets the users local time // shown above as September 11, 2012 - 12:02 am HST $user_time_now = date("F j, Y \- g:i a", (time()+$user_tz_offset)); // add a plus sign to time zones that are not negative if( !strstr( $user_tz_offset, "-" )) { $add_plus_sign = '+'; } // determine whether we should say "ahead of" or "behind" respective to Pacific time // TZ_OFFSET is a constant defined in config if( $user_tz_offset &lt; TZ_OFFSET) { $behind_or_ahead = 'behind'; } else { $behind_or_ahead = 'ahead of'; } ?&gt; </code></pre>
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    1. COTake a look here [http://stackoverflow.com/questions/4299183/](http://stackoverflow.com/questions/4299183/how-do-you-handle-timezone-difference-calculation-in-php)
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      1. POCalculate time equivalent respective to a users time zone and a fixed time in PHP
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    2. COWhy not just say "The sale begins in X hours time"? It'll be much less confusing to your users.
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      1. POCalculate time equivalent respective to a users time zone and a fixed time in PHP
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