title: PHP inserting date format into input's "placeholder"
body: <p>Within my PHP code I have a form in which one of its' input boxed should be inserted as date format. I would like to instruct the user to assign the date in a particular format. That instruction is given via HTML5's "placeholder".
  I did this:</p>
  
  <pre><code>&lt;input id="exam_date" name="exam_date" type="datetime" placeholder="&lt;?php echo now('d-m-y H:i:s'); ?&gt;"&gt;
  </code></pre>
  
  <p>But instead of present date format I get: </p>
  
  <pre><code>"now('d-m-y H:i:s')"
  </code></pre>
  
  <p>I wanted to show real date / time of inserting the time !
  How can I use "placeholder" to show present date time?</p>