title: log json with date and time format with winston node logger
body: <p>I am trying to log json with winston that includes a timestamp, I have the following configuration:</p>
  
  <pre><code>'use strict';
  
  import * as winston from 'winston';
  
  const LOG = !!process.env.LOG;
  
  export const { error, info, debug } = winston.createLogger({
    transports: [new winston.transports.Console()],
    silent: process.env.NODE_ENV === 'test' &amp;&amp; !LOG,
    format: winston.format.combine(
      winston.format.timestamp({
        format: 'YYYY-MM-DD HH:mm:ss'
      }),
      winston.format.colorize({ all: true }),
      winston.format.simple()
    )
  });
  </code></pre>
  
  <p>But it is logging messages like this:</p>
  
  <pre><code>info: connecting /closebanner {"timestamp":"2018-08-22 22:09:35"}
  </code></pre>
  
  <p>Only the timestamp is in json format and not the message.</p>