old_contents: var _merge = require('lodash.merge'),
      path = require('path'),
      lowdb  = require('lowdb')
  
  module.exports = new function() {
  
    var db = lowdb(path.resolve(__dirname) + '/data.json')
  
    var collectionKey = 'data'
    db(collectionKey)
  
    this.add = function(data) {
      var entry = _merge({}, data, {
          timestamp: new Date().getTime()
        }
      )
      db.object[collectionKey].push(entry)
      db.save()
    }
  
  }
new_contents: var _merge = require('lodash.merge'),
      path = require('path'),
      lowdb  = require('lowdb')
  
  module.exports = new function() {
  
    var db = lowdb(path.resolve(__dirname) + '/data.json')
  
    var collectionKey = 'data'
    db(collectionKey)
  
    this.add = function(data) {
      var entry = _merge({}, data, {
          timestamp: new Date().toISOString()
        }
      )
      db.object[collectionKey].push(entry)
      db.save()
    }
  
  }
subject: Change saved time format