title: cron expression parsing into java date
body: <ul>
  <li>my database having <code>10 18 16 ? * SUN,MON,WED,FRI *</code> cron expression then how to convert into Java date.</li>
  <li>how to comparing with present day time.</li>
  <li>and one more is how to compare to cron expressions i.e. <code>10 18 16 ? * SUN,MON,WED,FRI *</code> and <code>0 30 9 30 * ?</code></li>
  <li>please explain the sample code using quartz or spring scheduling.</li>
  </ul>