title: Set the default timezone in symfony
body: <p>i want to know how can i set timezone for an entire project?  </p>
  
  <p>i'm using symfony 1.4 with doctrine and i have a problem with datetime saving.<br>
  whenever i save a record, it's time is not correct and i know that's because of timezone.   </p>
  
  <p>i know i can use <code>date_default_timezone_set()</code> function to set default timezone, but i have to do it in every single action that i'm using date and it's not right.  </p>
  
  <p>is there an easier way to do it? i think doctrine should have something to set it automatically but i don't know how.</p>