title: Understanding nvd3 x-axis date format
body: <p>how is the date (x xAxis) formatted as  "1025409600000"? I have been studying their documentation but can not figure how this works, it would make my life easier if someone would help me to understand how to change this to a 'normal' date format, like MMDDYYYY</p>
  
  <p>This is the chart:
  <a href="http://nvd3.org/ghpages/stackedArea.html">http://nvd3.org/ghpages/stackedArea.html</a></p>
  
  <p>Documentation:
  <a href="https://github.com/mbostock/d3/wiki/Time-Formatting">https://github.com/mbostock/d3/wiki/Time-Formatting</a></p>
  
  <p>Thanks</p>