title: R - Date format check
body: <p>I am trying to check whether a given date is in dd/mm/yyyy format or not in <code>R</code> language and also whether it is a valid date or not at the same time. I want  output in TRUE or FALSE format, e.g.</p>
  
  <p><strong>Input</strong>:</p>
  
  <pre><code>date&lt;- c('12/05/2016','35/11/2067','12/52/1000')
  </code></pre>
  
  <p><strong>Output</strong>:</p>
  
  <pre><code>TRUE FALSE FALSE
  </code></pre>