title: How to send sms/email on scheduled time in iOS
body: <p>I want to build an app in swift to send sms or email on scheduled date and time and the data need to be stored in database. I know we need to use MFMessageComposeViewController or MFMailComposeViewController for sending sms/email but how to send only on scheduled date?</p>
  
  <p><em>For example: I want to schedule a sms for birthday wish of my friend on his birth date and let the app send the message on that specific date or time.</em> </p>
  
  <p>Can somebody share any tutorials related to this type of questions?</p>