Bug 808777

Summary:	Almost all of the Non-geographic timezones in system-config-date result in incorrect time
Product:	[Fedora] Fedora	Reporter:	James <fedorabugmail>
Component:	tzdata	Assignee:	Petr Machata <pmachata>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	16	CC:	mnewsome, nphilipp, pmachata
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2012-04-02 18:57:08 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description James 2012-03-31 18:19:04 UTC

When using Non-geographic timezones in system-config-date, the resulting time is always off by 2 times the number timezones away from GMT. For instance, selecting GMT-5 should give Eastern Standard Time but instead gives Pakistan Standard Time, which is UTC+5.


system-config-date package version is 1.9.67


Steps to Reproduce:
Set timezone according to geographic location
Update clock using ntpdate
Observe correct time is set

Set timezone using GMT-5 for Eastern Standard Time.
Update clock using ntpdate
Observe time is off by +10 hours.

Comment 1 Nils Philippsen 2012-04-02 09:34:18 UTC

It seems that the non-geographic time zones are named counterintuitively.

This is what I got when setting the time zone to "GMT-2" and "GMT+5" which right now correspond to Central European Summer Time (DST) and Eastern Standard Time, respectively:

nils@gibraltar:~> date -R
Mon, 02 Apr 2012 11:13:05 +0200
nils@gibraltar:~> date
Mon Apr  2 11:13:09 GMT-2 2012

nils@gibraltar:~> date -R
Mon, 02 Apr 2012 04:14:01 -0500
nils@gibraltar:~> date
Mon Apr  2 04:14:02 GMT+5 2012

The names of the time zones are defined in tzdata, changing component accordingly.

Comment 2 Petr Machata 2012-04-02 18:57:08 UTC

Yes they are.  It's silly, I don't know what rationale there is for this, but apparently POSIX mandates this.

*** This bug has been marked as a duplicate of bug 224442 ***