title: Force date and day name to appear in X axis
body: <p>I need to make both the day name and the date appear in the X-axis. So far, rrdtool seems to decide whether to put the date (only the day of the month though, eg: 17, 18 etc) or the day name depending on the size of the rendered image. As seen in the below images.</p>
  
  <p>How do I make rrdtool do something like this:</p>
  
  <pre><code>First line:  Tuesday
  Second line: 14/07/2015
  </code></pre>
  
  <p>Or even:</p>
  
  <pre><code>First line:  Tuesday  
  Second line: 14th July 2015
  </code></pre>
  
  <p>For each day within the week?</p>
  
  <p><img src="https://i.stack.imgur.com/PalgA.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/eBvDI.png" alt="enter image description here"></p>