title: how to convert my TIMESTAMP to UTC timestamp in magento
body: <p>i found many articals on this but none of give proper soluation </p>
  
  <p>my current system timezone is = <code>'asia/Kolkata'</code> </p>
  
  <p>my current magento timezone is <code>'asia/shanghai'</code>   </p>
  
  <p>this give me de correct <code>UTC</code> time here system time is <code>'2013-06-26 15:34:00'</code></p>
  
  <pre><code>   $timezone = date_default_timezone_get();
     date_default_timezone_set($timezone);
  
     $now = Mage::getModel('core/date')-&gt;timestamp(time());
     $current_date= date('Y-m-d H:i:s');
  </code></pre>
  
  <p>so here $current_date = <code>'2013-06-26 18:04:30'</code> </p>
  
  <p>but i have another mytimestamp..... ex :- $time = <code>'2013-06-26 15:34:00'</code>;</p>
  
  <pre><code>   $scheduletime = '2013-06-26 15:19:00';
     $dateTimestamp = Mage::getModel('core/date')-&gt;timestamp(strtotime($scheduletime));
     $schedule_time = date('Y-m-d H:i:s',strtotime($scheduletime));
  </code></pre>
  
  <p>so here $schedule_time = <code>'2013-06-26 23:34:00'</code> </p>
  
  <p>so actually what i want is to get difference between this two time and it should be : 0</p>