title: How to filter between two dates with the Date Filter in API Platform
body: <p>im using API Platform together with Symfony 4 and im trying to use the date filter as described here: <a href="https://api-platform.com/docs/core/filters/" rel="nofollow noreferrer">https://api-platform.com/docs/core/filters/</a></p>
  
  <p>when i use the filter like this ....something?_page=1&amp;lieferdat[after]=2018-12-01&amp;lieferdat[before]=2018-12-30</p>
  
  <p>the hydra response shows that the brackets are url encoded and i think its not working properly as i get all results instead of the filtered ones.
  In my Entity i added the DateFilter as any other filter which seems to be correct.</p>
  
  <p>Hydra Response:
   "something?lieferdat%5Bafter%5D=2018-12-01&amp;lieferdat%5Bbefore%5D=2018-12-30&amp;_page=1"</p>
  
  <p>Can anybody explain if i can use brackets in my requests or better: 
  Can anybody provide a working Date Filter implementation for Api Platform which demonstrates how to filter between two dates?</p>
  
  <p>Thanks in advice,
  Best regards</p>