title: datetime calendar : select date range in a single input field
body: <p>Is there a javascript datetimepicker that can selects 2 dates in a single input field. Like:
  <img src="https://i.stack.imgur.com/11DHB.png" alt="enter image description here">
  (Screenshot taken from google-analytics)</p>
  
  <p>Currently we need to use 2 form input fields to select date range.</p>
  
  <p>Is there any free datetimepicker that provides this functionality?</p>