title: VueJs - el-date-picker : How to set format default value new Date()
body: <p>I use el-date-picker to set form date with default value is new date. But when it save the value of date is yyyy-MM-dd.</p>
  
  <p>how to set :default-value with new Date() and format new Date is yyyy-MM-dd?</p>
  
  <p>here my code</p>
  
  <pre><code>&lt;el-date-picker v-model="value1" type="date" placeholder="Pick a day"
     format="dd-MM-yyyy" value-format="yyyy-MM-dd" :default-value="defaultDate"&gt;
  &lt;/el-date-picker&gt;
  
  return {
      defaultDate: new Date('2018-06-22')
    };
  </code></pre>
  
  <p>here my fiddle: <a href="https://jsfiddle.net/dede402/8fkmt2wv/11/" rel="nofollow noreferrer">https://jsfiddle.net/dede402/8fkmt2wv/11/</a></p>