1528592 - Date Object not working in Firefox developer console as expected

Status: RESOLVED DUPLICATE of bug 1073533

(DevTools :: Console, defect)

Description

[Venkateswara Tolla]

Attachment: Screenshot from 2019-02-17 11-50-56.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

new Date(2019, 11,1); execute in Developer console

Actual results:

Date 2019-11-30T18:30:00.000Z

Expected results:

Date 2019-11-01T18:30:00.000Z

Comment 1

[Paul_B]

Hi reporter,

Thank you for taking the time to add this report.
I was able to observe a similar discrepancy, namely in the input date and the expected result, as the months got incremented by 1. I'll attach a screenshot. This behavior was noticed across all the latest Firefox versions and OS-es (Windows 10, Mac OSX and Linux 18.04).
I'm going to add this to DevTools: Console component for a more advised opinion.

Comment 2

[Paul_B]

Attachment: New Date.PNG

Comment 3

[Nicolas Chevobbe [:nchevobbe]]

Thanks for filing this bug. It looks like Bug 1073533, so I'm setting it as duplicate.
I'll try to prioritize this so it gets fixed soon.