title: Cronos cron Service Working Cron Job Demo net core 5
body: <p>I'm using the Cronos ServiceWorkerCronJobDemo ( <a href="https://github.com/dotnet-labs/ServiceWorkerCronJob" rel="nofollow noreferrer">https://github.com/dotnet-labs/ServiceWorkerCronJob</a> )</p>
  <p>In a Dot Net Core 5 application</p>
  <p>As it stands it works as expected.
  But as soon as I start to change the cron expression to what I need &quot;0 0 1 * *&quot; or @monthly
  I need it to be schedule to run on the first of the month.</p>
  <p>I get an invalid value for the interval error.</p>
  <p>Does anyone have a solution?</p>
  <p><a href="https://i.stack.imgur.com/rL19c.png" rel="nofollow noreferrer">screen dump of error</a>
  <a href="https://i.stack.imgur.com/QZZQR.png" rel="nofollow noreferrer">screen dump of settings</a></p>