title: Plotting filled region between two dates in Gnuplot
body: <p>On the x-axis, I have time as a date %Y-%m-%d. On the y axis I have integers. </p>
  
  <p>Basically, I have a date range for each data point, usually given by a target date and a two week window on either side. I the plot the data point relative to that target window using vertical lines for the low and high ends of the window. </p>
  
  <p>I would like to shade the region between the low and high end.</p>
  
  <p>I tried adding " with filledcurves x1='2000-01-01'" </p>
  
  <p>Thanks</p>