mongoose-fake-timers.js

var mongoose = require('mongoose');
var sinon = require('sinon');
mongoose.connect('mongodb://localhost/test');

var kittySchema = new mongoose.Schema({
  name: String,
});

var Kitten = mongoose.model('Kitten', kittySchema);

let newTime = Date.now() + 36000; // May 31st 2016
let fakeClock = sinon.useFakeTimers(newTime);

function start () {
  Kitten.create({name: 'test'}).then(() => {
    console.log('created');
    return Kitten.find().exec();
  });
}

start();