1868577 - Using new Date of an invalid date results in a new date of 30 nov 1999

Status: RESOLVED DUPLICATE of bug 1866811

(Core :: JavaScript Engine, defect)

Description

[oostmeijer]

Attachment: firefox result.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.15

Steps to reproduce:

When using the following code in javascript on a website:

var newDate = new Date('0000-00-00');

See screenshot where I've executed the code above on https://developer.mozilla.org in Firefox and Safari

Actual results:

The result is that newDate will have a date of 30 nov 1999.

Where the result in safari / chrome would give an Invalid Date.

Expected results:

I would expect to have an Invalid date which can be checked with isNaN(newDate)