title: Best way to find date nearest to target in a list of dates?
body: <p>I have a list of Date objects, and a target Date. I want to find the date in the list that's nearest to the target date, but only dates that are before the target date.</p>
  
  <p>Example:
  2008-10-1
  2008-10-2
  2008-10-4</p>
  
  <p>With a target date of 2008-10-3, I want to get 2008-10-2</p>
  
  <p>What is the best way to do it?</p>