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POChanging date and time between timezones
 

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  1. POChanging date and time between timezones
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    <p>I have been trying to convert between timezones a given date and time. <br/>Code speaks more than words, so here it is:</p> <pre><code>/** * Returns the date and time in the new timezone. * * @param string $datetime: * the date and time to change between timezones * @param string $input_tz: * the input timezone * @param string $output_tz: * the output timezone * @return string The new date and time */ public function changeDateTime($datetime, $input_tz, $output_tz) { if($input_tz == $output_tz) return $datetime; /* * We calculate the hour and minute offset from GMT */ date_default_timezone_set($output_tz); $out_dst = date('I', $datetime) ? 1 : 0; $out_hour_offset = intval(substr(date('O', $datetime), 1, 3)) + $out_dst; $out_minute_offset = intval(substr(date('O', $datetime)), - 2); date_default_timezone_set($input_tz); $in_dst = date('I', $datetime) ? 1 : 0; $in_hour_offset = intval(substr(date('O', $datetime), 1, 3)) + $in_dst; $in_minute_offset = intval(substr(date('O', $datetime)), - 2); /* * We subtract hour and minute offsets to come up with total difference */ $hour_offset = $out_hour_offset - $in_hour_offset; $minute_offset = $out_minute_offset - $in_minute_offset; /* * Now we must take care of changing the day/month/year if necessary, as * well as the hour/minute for $datetime, and return that value. */ $date = new DateTime($datetime); if($hour_offset &gt; 0) { $date-&gt;add(date_interval_create_from_date_string($hour_offset . ' hours')); if($minute_offset &gt; 0) $date-&gt;add(date_interval_create_from_date_string($minute_offset . ' minutes')); } else if($hour_offset &lt; 0) { $date-&gt;sub(date_interval_create_from_date_string($hour_offset . ' hours')); if($minute_offset &gt; 0) $date-&gt;sub(date_interval_create_from_date_string($minute_offset . ' minutes')); } return $date-&gt;format('Y-m-d H:i:s'); } </code></pre> <p>However, it does not seem to work well. This is the code I am running to test whether it works or not:</p> <pre><code>$newdatetime = $gato-&gt;changeDateTime("2012-08-10 11:33:33", 'Europe/London', 'Europe/Madrid'); echo $newdatetime; </code></pre> <p>And this is my expected output: 2012-08-10 12:33:33<br /> But this is my actual output: 2012-08-10 11:33:33, which means there is no change in time.</p>
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    1. USJose Salvatierra
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      1. VTUpMod
    1. COFrom where I see it, there is a 1 hour change
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      1. USasprin
    2. COHmm then you probably need some glasses ^^
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      1. USJose Salvatierra
    3. COWhy make this so complicated? Just store date/time as UTC. That will not change wherever you are on this planet. Then change the UTC to the appropriate time zone.
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      1. USEd Heal
 

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