title: How to convert a carbon into string, to take the date only?
body: <p>i have an collection like this</p>
  
  <pre><code>0 =&gt; array:4 [
    "so" =&gt; "SO-1"
    "product_name" =&gt; "EXTREME FORTE - BP"
    "created_at" =&gt; Carbon @1527481346 {#628
      date: 2018-05-28 04:22:26.0 UTC (+00:00)
    }
    "id" =&gt; "5b0b84027475aa1508002623"
  ]
  </code></pre>
  
  <p>how to take the "2018-05-28" only?
  can somebody help me to fix this problem? thank's anyway</p>