115942 - Time zone doesn't update correctly

Status: VERIFIED DUPLICATE of bug 127246

(Core :: JavaScript Engine, defect)

Description

[Andy Lyttle]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.6+)
Gecko/20011218
BuildID:    2001121803

Apparently the current time zone is read at launch time and cached.  If the time
zone changes while Mozilla is running, the cached value is now wrong.

Reproducible: Always
Steps to Reproduce:
1. Type "javascript:new Date();" into the address bar.  The time and time zone
should match the system settings.
2. Change the system time zone in the Control Panel
3. Click in the address bar and press Enter to get the time again

Actual Results:  The time zone does not change.  The time adjusts so it's
correct for the old time zone (in other words, Mozilla does have the correct
time in GMT).

Expected Results:  You should see the new time zone, with the correct local time.

This is similar to, but not the same as, bug 115911 on Mac OS.

Comment 1

[Phil Schwartau]

Reassigning to Patrick as with bug 115911. Note, I had already changed
the OS on bug 115911to "All", and added my findings on WinNT and Linux.
So at this point I think this bug is now a duplicate of the other. 

Andy, Patrick: what do you think? 

Comment 2

[Andy Lyttle]

Yeah, I didn't see that until after I submitted this.  I'm getting different
results between Mac OS and Windows.

On Mac OS, if I change the time zone, new Date() shows the correct local time
but the incorrect time zone (so, GMT is wrong).

On Windows, if I change the time zone, new Date() shows the incorrect local time
but the correct time zone (so GMT is correct).

Are these the same bug?  Are you getting different results than I?

Comment 3

[Patrick C. Beard]

I don't believe they are the same bug, so I'd recommend we file separate 
bugs for the different platforms. I'm only prepared to fix this on the Mac. 
This is highly platform dependent code.

Comment 4

[Phil Schwartau]

OK, reassigning this one to Kenton; cc'ing Patrick. If it helps,
here are my questions/findings from bug 115911:


------- Additional Comment #1 From Phil Schwartau 2001-12-18 16:34 -------
Changing OS : Mac ---> All, since I see the same problem on WinNT.
I'm not sure how to change the timezone on Linux. Anyone know?


TIMEZONE
On WinNT, if I change my timezone while Mozilla (or the JS shell) is
running , such change is not reflected in my next call to new Date().
Same is true on Mac9.1. Can't try on Linux yet (see above). 


MONTH/DAY/TIME
What if we change month/day/time while Mozilla/JS shell is running?
WinNT: the change IS reflected in my next call to new Date() !!!
Linux: the change IS reflected in my next call to new Date() !!!
Mac9.1 the change is NOT reflected


I don't know if the MONTH/DAY/TIME issue can be fixed in the same
way as the TIMEZONE problem, but I wanted to mention the discrepancy -

Comment 5

[Andy Lyttle]

Interestingly, Mac OS now behaves this way too.  Marking as a dupe of bug 127246.

*** This bug has been marked as a duplicate of 127246 ***

Comment 6

[Phil Schwartau]

Verified Duplicate -