In February government of Mongolia decided not to use DST anymore. So we need to update zone file.
Created attachment 1651 [details] no DST in Mongolia
Subject: Bug 4276 CVSROOT: /cvs/glibc Module name: libc Changes by: jakub@sourceware.org 2007-03-26 13:57:50 Modified files: . : ChangeLog timezone : africa asia australasia backward europe iso3166.tab leapseconds northamerica private.h southamerica zdump.c zic.c zone.tab Log message: [BZ #4276] * timezone/africa: Update from tzdata2007d. * timezone/asia: Likewise. * timezone/australasia: Likewise. * timezone/backward: Likewise. * timezone/europe: Likewise. * timezone/iso3166.tab: Likewise. * timezone/leapseconds: Likewise. * timezone/northamerica: Likewise. * timezone/southamerica: Likewise. * timezone/zone.tab: Likewise. * timezone/private.h: Update from tzcode2007d. * timezone/zdump.c: Likewise. * timezone/zic.c: Likewise. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/libc/ChangeLog.diff?cvsroot=glibc&r1=1.10565&r2=1.10566 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/africa.diff?cvsroot=glibc&r1=1.19&r2=1.20 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/asia.diff?cvsroot=glibc&r1=1.38&r2=1.39 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/australasia.diff?cvsroot=glibc&r1=1.31&r2=1.32 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/backward.diff?cvsroot=glibc&r1=1.17&r2=1.18 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/europe.diff?cvsroot=glibc&r1=1.37&r2=1.38 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/iso3166.tab.diff?cvsroot=glibc&r1=1.14&r2=1.15 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/leapseconds.diff?cvsroot=glibc&r1=1.12&r2=1.13 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/northamerica.diff?cvsroot=glibc&r1=1.32&r2=1.33 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/private.h.diff?cvsroot=glibc&r1=1.13&r2=1.14 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/southamerica.diff?cvsroot=glibc&r1=1.31&r2=1.32 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/zdump.c.diff?cvsroot=glibc&r1=1.16&r2=1.17 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/zic.c.diff?cvsroot=glibc&r1=1.23&r2=1.24 http://sourceware.org/cgi-bin/cvsweb.cgi/libc/timezone/zone.tab.diff?cvsroot=glibc&r1=1.26&r2=1.27
Fixed.