title: Drupal 8 contextual filter for date
body: <p>does anybody know how to implement the view with contextual filter on date/time value? I have a content type <em>Event</em> with date field within it and need to somehow filter items within specific month. Not sure if it can even be done without special programming and if so, whether via that contextual filter (like node/) or maybe via exposed filter with list of months so user can filter items by himself??</p>
  
  <p>Thanks
  TC</p>