title: Is there any existing grok{} pattern for date format YYYY/MM/DD HH:mm:ss?
body: <p>I was checking the nginx error logs at our server and found that they start with date formatted as:</p>
  
  <pre><code>2015/08/30 05:55:20
  </code></pre>
  
  <p>i.e. <code>YYYY/MM/DD HH:mm:ss</code>. I was trying to find an existing grok date pattern which might help me in parsing this quickly but sadly could not find any such date format. Eventually, I had to write the pattern as: </p>
  
  <pre><code>%{YEAR}/%{MONTHNUM}/%{MONTHDAY}[T ]%{HOUR}:?%{MINUTE}(?::?%{SECOND})?%{ISO8601_TIMEZONE}? 
  </code></pre>
  
  <p>I am still hoping if there is a shorter pattern for the same ?</p>