title: Facebook Insights reliable way of getting the last update?
body: <p>Today is 23 gen 2012. I'm querying Facebook Insights with FQL using PHP SDK. The metrics show different delay in insights updates:</p>
  
  <ul>
  <li><code>page_friends_of_fans metric</code>: <strong>available for 20</strong> gen 2012 and before, not available for 21 gen 2012</li>
  <li><code>page_fans</code>:  <strong>available for 21</strong> gen 2012 and before, not for 22 gen 2012</li>
  </ul>
  
  <p><em>First date of availability for both is then: 20 gen 2012.</em> Pattern could be today minus 3 days. <strong>Since i have to specify end_date parameter, is there any reliable way of getting the last available date?</strong></p>