title: C++11 how to print out high resolution clock time_point
body: <p>How do I print out a time_point when the time_point is obtained from high_resolution_clock?</p>
  
  <pre><code>timestamp = std::chrono::high_resolution_clock::now();
  std::time_t now = std::chrono::system_clock::to_time_t(timestamp);
  std::cout &lt;&lt; std::ctime(&amp;now) &lt;&lt; std::endl;
  </code></pre>
  
  <p>I get the following error message when compiling:</p>
  
  <pre><code>error: no viable conversion from 'time_point&lt;class std::__1::chrono::steady_clock, duration&lt;[...], ratio&lt;[...], 1000000000&gt;&gt;&gt;' to 'const time_point&lt;class std::__1::chrono::system_clock, duration&lt;[...], ratio&lt;[...], 1000000&gt;&gt;&gt;'
          time_t tt = std::chrono::system_clock::to_time_t(timestamp);
  </code></pre>