Mongoose Issue

moongoose_issue.js

var path = path = require('path');
require.paths.unshift(path.join(__dirname, "../node_modules"));
require.paths.unshift(path.join(__dirname, "../vendor"));
require('noop');

var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    ObjectId = Schema.ObjectId;
    
var ObservationSchema = new Schema({            
  date_time: { type: Date, index: true }, // This works instead: Date 
});

mongoose.model('Observation', ObservationSchema);

var Observation = mongoose.model('Observation'); 
var o = new Observation({ date_time: new Date() });
o.save(global.throwop);

console.dir(o.date_time); // Woah! Why is this {}?

console.dir(o);