title: In web/cloud applications, how can I have an automated task (based on date/time)?
body: <p>My web site stores invoices.</p>
  
  <p>I would like to process them every night at midnight.</p>
  
  <p>I would also like to send out notices nightly at midnight.</p>
  
  <p>But the web is stateless.</p>
  
  <p>I do not have my own server.</p>
  
  <p>Is there a way?</p>