title: How do I calculate % of task's completion given start date, end date, and TODAY()
body: <p>I have a gant with start date, end date, and % complete columns. By manually entering a number in the % column the bar representing the task gets shaded. What I want to do is instead of representing % completed, I want to show how much time is left before the end date from today.</p>
  
  <pre><code>      Start        End       % Time remaining from TODAY()
  i.e. 12/01/2014   03/15/2015   (End date has not yet occurred)
       12/29/2014   12/29/2014   (Task was started and finished this day)
  </code></pre>