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Bug#552110: marked as done (tzdata: 2009o breaks DST in Bangladesh)

Your message dated Wed, 22 Jun 2011 15:44:32 +0200
with message-id <20110622134432.GA498@rivendell.home.ouaza.com>
and subject line Already fixed
has caused the Debian Bug report #552110,
regarding tzdata: 2009o breaks DST in Bangladesh
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
552110: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=552110
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: tzdata
Severity: important
Version: 2009o-1
Tags: patch
User: ubuntu-devel@lists.ubuntu.com
Usertags: origin-ubuntu ubuntu-patch karmic

Hello,

In https://launchpad.net/bugs/456322 it was reported that 2009o breaks
DST in Bangladesh:

$ zdump -v -c 2007,2015 Asia/Dhaka
Asia/Dhaka Fri Jun 19 16:59:59 2009 UTC = Fri Jun 19 22:59:59 2009 BDT isdst=0 gmtoff=21600
Asia/Dhaka Fri Jun 19 17:00:00 2009 UTC = Fri Jun 19 23:00:00 2009 BDST isdst=0 gmtoff=21600

So DST is not considered at all, and clocks are off by an hour:

$ LANG= date -u; LANG= TZ=Asia/Dhaka date
Fri Oct 23 12:30:57 UTC 2009
Fri Oct 23 18:30:57 BDST 2009

This is due to our glibc not understanding open end dates on DST
rules. This already happened when Bangladesh DST was introduced the
first time (https://launchpad.net/bugs/383444) and back then it was
discussed with upstream, who proposed to patch it to set an arbitrary
end date.

I did that for Ubuntu now by setting an arbitrary end date to Jan 1 2100
so that it works now:

$ zdump -v -c 2007,2101 Asia/Dhaka
Asia/Dhaka  Fri Jun 19 16:59:59 2009 UTC = Fri Jun 19 22:59:59 2009 BDT isdst=0 gmtoff=21600
Asia/Dhaka  Fri Jun 19 17:00:00 2009 UTC = Sat Jun 20 00:00:00 2009 BDST isdst=1 gmtoff=25200
Asia/Dhaka  Thu Dec 31 16:59:59 2099 UTC = Thu Dec 31 23:59:59 2099 BDST isdst=1 gmtoff=25200
Asia/Dhaka  Thu Dec 31 17:00:00 2099 UTC = Thu Dec 31 23:00:00 2099 BDT isdst=0 gmtoff=21600

$ LANG= date -u; LANG= TZ=Asia/Dhaka date
Fri Oct 23 12:32:53 UTC 2009
Fri Oct 23 19:32:53 BDST 2009

Thanks for considering,

Martin

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)

diff -u tzdata-2009o/debian/changelog tzdata-2009o/debian/changelog
--- tzdata-2009o/debian/changelog
+++ tzdata-2009o/debian/changelog
@@ -1,3 +1,11 @@
+tzdata (2009o-1ubuntu1) karmic; urgency=low
+
+  * Add bdst-workaround.diff: Work around glibc not being able to cope with
+    open end dates by specifying an arbitrary one far in the future. This
+    fixes time Bangladesh, which has eternal DST now. (LP: #456322)
+
+ -- Martin Pitt <martin.pitt@ubuntu.com>  Fri, 23 Oct 2009 14:00:01 +0200
+
 tzdata (2009o-1) unstable; urgency=low
 
   * New upstream release.
diff -u tzdata-2009o/debian/patches/series tzdata-2009o/debian/patches/series
--- tzdata-2009o/debian/patches/series
+++ tzdata-2009o/debian/patches/series
@@ -2,2 +2,3 @@
 java.diff -p1
+bdst-workaround.diff
 argentinas-dst-2009.diff -p1
only in patch2:
unchanged:
--- tzdata-2009o.orig/debian/patches/bdst-workaround.diff
+++ tzdata-2009o/debian/patches/bdst-workaround.diff
@@ -0,0 +1,16 @@
+# Description: Work around glibc not being able to cope with open end dates by specifying an arbitrary one far in the future.
+# Ubuntu: https://launchpad.net/bugs/456322, https://launchpad.net/bugs/383444
+Index: tzdata-2009o/asia
+===================================================================
+--- tzdata-2009o.orig/asia	2009-10-14 22:49:38.000000000 +0200
++++ tzdata-2009o/asia	2009-10-23 14:12:07.000000000 +0200
+@@ -205,7 +205,8 @@
+ 			6:30	-	BURT	1951 Sep 30
+ 			6:00	-	DACT	1971 Mar 26 # Dacca Time
+ 			6:00	-	BDT	2009 Jun 19 23:00 # Bangladesh Time
+-			6:00	1:00	BDST
++			6:00	1:00	BDST	2100 Jan 1 # arbitrary end date; unspecified end date does not work with glibc
++			6:00	-	BDT
+ 
+ # Bhutan
+ # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]

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--- End Message ---
--- Begin Message --- 
Version: 2009u-1

Given the problematic patch has been dropped, this bug must be fixed with
the new upstream release where the patch has been dropped.
-- 
Raphaël Hertzog ◈ Debian Developer

Follow my Debian News ▶ http://RaphaelHertzog.com (English)
                      ▶ http://RaphaelHertzog.fr (Français)

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