title: What is equivalent GAE cron expression for following
body: <pre><code>I have spring cron equation.
  I need equivalent GAE cron for those.
  GAE cron doc seems bit complex.
  cron="0 0 7 * * MON-FRI"
  cron="0 30 9 * * "SUN"
  </code></pre>
  
  <p>I need equivalent GAE cron for those</p>