title: Carbon initial date value
body: <p>Maybe I'm not seeing the forest because of the trees but here's what I am facing:</p>
  
  <pre><code>$week_start = new Carbon();
  $week_start-&gt;setISODate($year,$week);  //2016 , 21
  
  $init = $week_start; //I am assigning the datetime created to $init variable (1)
  
  $min_sqldate = $week_start-&gt;toDateString(); //string of date
  $max_sqldate = $week_start-&gt;addDays(6)-&gt;toDateString(); //string of date adding 6 days
  </code></pre>
  
  <p>At this point <code>$init</code> variable already has a value of <code>$max_sqldate</code>. (2)</p>
  
  <p>How is this possible? How should I keep my initial variable so I can use it later on ?</p>
  
  <p>Value of <code>$init</code> in case (1): </p>
  
  <pre><code> Carbon {#328 ▼
        +"date": "2016-05-23 16:58:36.000000"
        +"timezone_type": 3
        +"timezone": "Europe/Helsinki"
      }
  </code></pre>
  
  <p>Value of <code>$init</code> in case (2): </p>
  
  <pre><code> Carbon {#328 ▼
        +"date": "2016-05-29 17:00:34.000000"
        +"timezone_type": 3
        +"timezone": "Europe/Helsinki"
   }
  </code></pre>