title: how to change rails datetime_field defaults?
body: <p>Me and my co-workers were testing my web app. And, in the form in my computer/local/dev and server/production it shows the date format <code>dd/mm/yyyy 00:00</code> and for my coworkers <code>mm/dd/yyyy 00:00 am/pm</code> with the same local chrome settings and computer settings.  </p>
  
  <ul>
  <li>why is this? </li>
  <li>and how can I change this for all users? if possible.</li>
  </ul>
  
  <p>piece of code:</p>
  
  <pre><code>&lt;div class="mini_jumbotron"&gt;
                  &lt;div class="mini_text"&gt;Inicio&lt;%= image_tag("calendar.png", :class =&gt; "calendar")%&gt;
                    &lt;/div&gt; &lt;br&gt;
                  &lt;/div&gt;
                &lt;%= f.datetime_field :Inicio %&gt;
  </code></pre>