title: How can I convert a date string into another format using MapStruct?
body: <p>I am using MapStruct to map values from a source to a target class. Both classes shall have a date property but with different dateformats.
  How can I convert the dateformat whilst mapping the properties using MapStruct?</p>
  
  <p>Date format from source class: 2018-05-18T18:43:33.623+0200</p>
  
  <p>Date format of target class: 2018-05-18</p>