MongoDB Data: JSON object 

{"_id":{"$oid":"59cd182054cbe615617b83b0"},"address":{"building":"1007","coord":[-73.856077,40.848447],"street":"Morris Park Ave","zipcode":"10462"},"borough":"Bronx","cuisine":"Bakery","grades":[{"date":{"$date":"2014-03-03T00:00:00.000Z"},"grade":"A","score":2},{"date":{"$date":"2013-09-11T00:00:00.000Z"},"grade":"A","score":6},{"date":{"$date":"2013-01-24T00:00:00.000Z"},"grade":"A","score":10},{"date":{"$date":"2011-11-23T00:00:00.000Z"},"grade":"A","score":9},{"date":{"$date":"2011-03-10T00:00:00.000Z"},"grade":"B","score":14}],"name":"Morris Park Bake Shop","restaurant_id":"30075445"}

CIS will parse and show date in UTC format
date = 2011-11-23T00:00:00.000Z

It will prevent if we want to do any numerical operation