Bear Bear - 7 months ago 35
Javascript Question

JavaScript - difference between Date(), new Date(), and ISODate

I've seen various versions of this question, but none of them answer my question.

I want to create an ISODate. For MongoDB. I'm using Node.js

In Node, when I do:


I get:

Mon Sep 26 2016 15:17:04 GMT-0400 (EDT) <-- This is correct.

When I do:

console.log(new Date());

I get:

2016-09-26T19:17:04.731Z <-- This is 4 hours ahead

My understanding of the way to do ISODATE is:

var isodate = new Date().toISOString()

Which yields a time 4 hours ahead of "now".

My system date is correct.
I run this one different machines, and I get the same results.

Can someone please explain why I'm getting a discrepancy in time?


The difference is that 2016-09-26T19:17:04.731Z related to GMT0 timezone and Mon Sep 26 2016 15:17:04 GMT-0400 (EDT) to your local timezone. Both are point to the same time :)

You can read more about data formats and timezones in Wiki