title: core-plot and NSDate (iPhone)
body: <p>I wish to plot a line graph where the x-axis is defined as a number of days between two dates and the y-axis is a value that varies on each of the days.</p>
  
  <p>I can plot the y values as an NSNumber but I have no idea how to set the ranges and the markup on the x-axis. I have looked at the date example in the "examples" directory of the core-plot distribution but have found it a little confusing.</p>
  
  <p>Does anyone know of a tutorial, or code sample, which might asist me in this regard?</p>
  
  <p>Thank you in advance.</p>