title: running a task on particular datetime?
body: <p>I am wondering how to write a proper code for runnning a job on particular date on Firebase.</p>
  <p>For cron-type job, I know these situation should be realized as follows:</p>
  <pre class="lang-js prettyprint-override"><code>exports.scheduledFunctionCrontab = functions.pubsub.schedule('5 11 * * *')
    .timeZone('America/New_York') // Users can choose timezone - default is America/Los_Angeles
    .onRun((context) =&gt; {
    console.log('This will be run every day at 11:05 AM Eastern!');
    return null;
  });
  </code></pre>
  <p>but this for &quot;repeated&quot; job and not for &quot;one-time&quot; job.</p>
  <p>Is there any way to run particular job on a particular date using Firebase?</p>
  <p>Thanks!</p>