title: Android: compare calendar dates
body: <p>In my app I´m saving when I last updated some data from my server.
  Therefore I used:</p>
  
  <pre><code>long time = Calendar.getInstance().getTimeInMillis();
  </code></pre>
  
  <p>Now I want that the data is updated twice a year at 03.03 and 08.08.
  How can I check wheater one of these two date boarders were crossed since last update?</p>