599802 - Firefox 4 returns wrong time using new Date()

Status: RESOLVED DUPLICATE of bug 591845

(Core :: JavaScript Engine, defect)

Description

[Jaroslav Benc]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6) Gecko/20100101 Firefox/4.0b6

if you call new Date() FF3 and FF4 have different results where FF4 is not correct

Reproducible: Always

Steps to Reproduce:
try document.write(new Date()); in FF3 and FF4
Actual Results:  
FF4 - Sun Sep 26 2010 18:44:09 GMT-1100 (New Zealand Standard Time)
FF3 - Mon Sep 27 2010 18:44:46 GMT+1300 (New Zealand Daylight Time) 

Expected Results:  
FF4 - Mon Sep 27 2010 18:44:09 GMT+1300 (New Zealand Daylight Time)
FF3 - Mon Sep 27 2010 18:44:46 GMT+1300 (New Zealand Daylight Time)

Comment 1

[Jaroslav Benc]

Attachment: Run this example in FF4 and FF3 and see different results

Comment 2

[Mike Shaver (:shaver -- probably not reading bugmail closely)]

paul loves it when the antipodes undergo a daylight-time transition.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Possibly a regression from bug 591845?

Comment 4

[Brian Hackett [Laid off!]]

I can reproduce this on Vista x64 using 4.0b6 but not the latest nightly.  I think that the fix for bug 591845 did not get in until after 4.0b6 was released.

Comment 5

[Boris Zbarsky [:bzbarsky]]

Ah, hmm.  Does the "Target Milestone" on checked-in bugs in JS-land not correspond to the release the bug was fixed for?