old_contents: const path = require('path');
  const interpreter = path.resolve(process.env.HOME, 'n/versions/node/7.8.0/bin/node');
  
  module.exports = {
    /**
     * Application configuration section
     * http://pm2.keymetrics.io/docs/usage/application-declaration/
     */
    apps : [
  
      // First application
      {
        name      : "numbers",
        script    : "app.js",
        interpreter: interpreter,
        env: {
          NODE_ENV: "development",
          PORT: 4001,
          DEBUG: "numbers"
        },
        env_production : {
          NODE_ENV: "production",
          PORT: 4001
        }
      }
    ]
  }
  
new_contents: const path = require('path');
  const interpreter = path.resolve(process.env.HOME, 'n/versions/node/7.8.0/bin/node');
  
  module.exports = {
    /**
     * Application configuration section
     * http://pm2.keymetrics.io/docs/usage/application-declaration/
     */
    apps : [
  
      // First application
      {
        name      : "numbers",
        script    : "app.js",
        log_date_format: "YYYY-MM-DD HH:mm Z",
        interpreter: interpreter,
        env: {
          NODE_ENV: "development",
          PORT: 4001,
          DEBUG: "numbers"
        },
        env_production : {
          NODE_ENV: "production",
          PORT: 4001
        }
      }
    ]
  }
  
subject: add log timestampl