title: cron expression for Spring scheduler - run only once a year
body: <p>My Spring service loooks like </p>
  
  <pre><code>@Scheduled( cron="0 0  7 * * SUN")
  public void doSomething() {
      // do something
  }
  </code></pre>
  
  <p>I understand you can't have the 7th value which is reserved for specifying a year. using a expression can I tell spring to just run once a year at a particular time say 25th Dec 6 am in 2020 ?</p>
  
  <p>Thanks</p>