npm install mongoose-types

var mongoose = require("mongoose");
var db = mongoose.createConnection("mongodb://localhost/sampledb");
var mongooseTypes = require("mongoose-types");
mongooseTypes.loadTypes(mongoose);

var mongoose = require("mongoose");
var db = mongoose.createConnection("mongodb://localhost/sampledb");
var mongooseTypes = require("mongoose-types");
// Only load the email type
mongooseTypes.loadTypes(mongoose, "email");

var Email = mongoose.SchemaTypes.Email;
var UserSchema = new Schema({
  email: {
      work: Email
    , home: Email
  }
});

var Url = mongoose.SchemaTypes.Url;
var VisitSchema = new Schema({
    url: Url
  , referer: Url
});

var mongoose = require("mongoose");
var db = mongoose.createConnection("mongodb://localhost/sampledb");
var mongooseTypes = require("mongoose-types")
  , useTimestamps = mongooseTypes.useTimestamps;
var UserSchema = new Schema({
    username: String
});
UserSchema.plugin(useTimestamps);
mongoose.model('User', UserSchema);
var User = db.model('User', UserSchema);

var user = new User({username: 'Prince'});
user.save(function (err) {
  console.log(user.createdAt); // Should be approximately now
  console.log(user.createdAt === user.updatedAt); // true

  // Wait 1 second and then update the user
  setTimeout( function () {
    user.username = 'Symbol';
    user.save( function (err) {
      console.log(user.updatedAt); // Should be approximately createdAt + 1 second
      console.log(user.createdAt < user.updatedAt); // true
    });
  }, 1000);
});

make test