title: Exposed date filter in Drupal - making "month" optional
body: <p>I have a view on my site which lists a video archive and an exposed filter with a Year/Month granularity. My problem is that the filter only accepts inputs where both the Year and Month values are selected, but I really need to make it possible for users to filter by year without necessarily selecting the month and also to be able to select the year first and then refine the search with filtering by month if they want to.</p>
  
  <p>I am a Drupal beginner, so I don't know much about Drupal's infrastructure. I don't even know where views are stored. If I did, maybe I could alter the code somehow. </p>