title: Yii2: How to filter by 'date' and by 'time' from a 'datetime' db column
body: <p>In a user table I have a <code>created_at</code> column. In a User AR model that becomes a property, and in <code>\yii\grid\GridView</code> I split that property onto <code>'columns' =&gt; ['created_at:date', 'created_at:time'],</code></p>
  
  <p><strong>Question:</strong> How do I habilitate a search field for those respective given columns, I mean they aren't actual db columns, therefore not model properties. so I can't do</p>
  
  <pre><code>$query-&gt;andFilterWhere([
              'crated_at_date' =&gt; $this-&gt;crated_at_date,
              'created_at_time' =&gt; $this-&gt;created_at_time,
          ]);
  </code></pre>
  
  <p>I know the search field is related to <code>\yii\grid\Column::filterOptions</code> but more specifically I don't know how to specify the <code>andFilterWhere()</code> clause within the search model.</p>