title: obtain current day using chrono
body: <p>C++11 provide a function to return current time. However, I cannot find there is a function to return current day. And I use boost to do so. </p>
  
  <pre><code>boost::gregorian::date TODAY = boost::gregorian::day_clock::local_day();
  </code></pre>
  
  <p>Is there any way to achieve the same result using chrono? </p>
  
  <p>EDIT: What I want is to use time_point to represent current day. That means the hour,minute and second are zero 2013-07-31 00:00:00</p>