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    <p>I think, Rails/Ruby is not able to parse a date in this format:</p> <pre class="lang-js prettyprint-override"><code>$("#question_deadline").datepicker("option", "dateFormat", "DD, d MM, yy"); // full day name, day (w/o leading zero), full month name, 4-digit year </code></pre> <p>In your controller, you might want to add a line such as</p> <pre class="lang-ruby prettyprint-override"><code>def create/update ... @question.deadline = DateTime.strptime(params[:question][:deadline], '%A, %d %B, %Y') # assuming my jquery-to-ruby format-mapping is adequate ;-) if @question.save ... end </code></pre> <p>Beware, that this code easily breaks on malformed date strings.</p> <p>If you don't want to change the format to, e.g. <code>'yy-mm-dd'</code> (in Ruby-land it's <code>'%Y-%m-%d'</code>), you may want to populate the selected date to another HTML element using the <a href="http://jqueryui.com/demos/datepicker/#option-altFormat" rel="nofollow"><code>altField</code> option</a> and hide the actual datepicker input field via CSS:</p> <pre class="lang-js prettyprint-override"><code>$("#somewhere_else").datepicker( dateFormat: "%yy-%mm-%dd", altField: "#question_deadline", altFormat: "DD, d MM, yy", ... ); </code></pre> <pre class="lang-html prettyprint-override"><code>&lt;%= form_for @question do |f| %&gt; ... &lt;%= text_field_tag 'somewhere_else', @question.deadline %&gt; &lt;%= f.hidden_field :deadline %&gt; ... &lt;% end %&gt; </code></pre> <p>That'll work, at least for me :-)</p> <p>—Dominik</p>
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