title: Default setting today date for datetimepicker
body: <p>Im using bootstrap3 date time picker. 
  Js code</p>
  
  <pre><code>$(function () {
              $('#datetimepicker4').datetimepicker({
  
                  sideBySide: true
              });
          });
  </code></pre>
  
  <p>View:</p>
  
  <pre><code>&lt;div class="container"&gt;
      &lt;div class="row"&gt;
          &lt;div class='col-sm-4'&gt;
        &lt;%= label_tag :start_time, 'Start time' %&gt;
        &lt;div class="input-group date" id="datetimepicker4"&gt;
          &lt;%= text_field_tag :start_time, nil, class: 'form-control', data: { date_format: 'YYYY/MM/DD hh:mm A'} %&gt;
          &lt;span class="input-group-addon"&gt;&lt;span class="glyphicon glyphicon-calendar"&gt;&lt;/span&gt;&lt;/span&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>All is good, but it is empty by default. Can instead of this defaultly put today date and time?</p>