title: Cron Job to trigger AWS Lambda not working as expected
body: <p>I want to trigger my AWS lambda function on 15th of every month but my function is triggering after every 30 minutes. My function in Serverless.yml is </p>
  
  <pre><code>monthlyTbAlert:
      warmup: true
      handler: handlers/monthly-tbalert/index.monthlyTbAlert
      timeout: 60
      events:
        - schedule: cron(0 0 10 15 1/1 ? *)
          enabled: true
  </code></pre>