bug#6897: date -d '1991-04-14 +1 day' fails

[李嘉鹏]

Hi,
I used some script(At the end of the letter) to get a series of date. but the 
script always fails at the date 1991-04-14. so I tested the single command
    date -d '1991-04-14 +1 day'
It would also fail with a error message
    date: invalid date `1991-04-14 +1 day'
displayed.
 
Here's some infomation about my platform:
address@hidden:~> env
MKLROOT=/home/jpli/software/intel/Compiler/11.1/072/mkl
LESSKEY=/etc/lesskey.bin
NNTPSERVER=news
INFODIR=/usr/local/info:/usr/share/info:/usr/info
MANPATH=/home/jpli/software/ncview-1.93g/man:/home/jpli/software/intel/Compiler/11.1/072/man/en_US:/home/jpli/software/intel/Compiler/11.1/072/mkl/man/en_US:/home/jpli/software/intel/Compiler/11.1/072/man/en_US:/home/jpli/software/intel/Compiler/11.1/072/mkl/man/en_US:/software/pgi/linux86-64/7.1/mpi/mpich/man:/software/pgi/linux86-64/7.1/man:/usr/lib64/mpi/gcc/openmpi/share/man:/usr/local/man:/usr/local/share/man:/usr/share/man
HOSTNAME=databank
XKEYSYMDB=/usr/share/X11/XKeysymDB
INTEL_LICENSE_FILE=/home/jpli/software/intel/Compiler/11.1/072/licenses:/opt/intel/licenses:/home/jpli/intel/licenses:/home/jpli/software/intel/Compiler/11.1/072/licenses:/opt/intel/licenses:/home/jpli/intel/licenses
NCARG_INCLUDE=/software/ncarg-pgi/include
HOST=databank
TERM=xterm
SHELL=/bin/bash
PROFILEREAD=true
HISTSIZE=1000
SSH_CLIENT=172.16.102.36 54010 22
LIBRARY_PATH=/home/jpli/software/intel/Compiler/11.1/072/lib/intel64:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t:/home/jpli/software/intel/Compiler/11.1/072/lib/intel64:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t
FPATH=/home/jpli/software/intel/Compiler/11.1/072/mkl/include:/home/jpli/software/intel/Compiler/11.1/072/mkl/include
MORE=-sl
QTDIR=/usr/lib/qt3
SSH_TTY=/dev/pts/2
JRE_HOME=/usr/lib64/jvm/jre
USER=jpli
LS_COLORS=no=00:fi=00:di=01;34:ln=00;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=41;33;01:ex=00;32:*.cmd=00;32:*.exe=01;32:*.com=01;32:*.bat=01;32:*.btm=01;32:*.dll=01;32:*.tar=00;31:*.tbz=00;31:*.tgz=00;31:*.rpm=00;31:*.deb=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:*.lzma=00;31:*.zip=00;31:*.zoo=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:*.tb2=00;31:*.tz2=00;31:*.tbz2=00;31:*.avi=01;35:*.bmp=01;35:*.fli=01;35:*.gif=01;35:*.jpg=01;35:*.jpeg=01;35:*.mng=01;35:*.mov=01;35:*.mpg=01;35:*.pcx=01;35:*.pbm=01;35:*.pgm=01;35:*.png=01;35:*.ppm=01;35:*.tga=01;35:*.tif=01;35:*.xbm=01;35:*.xpm=01;35:*.dl=01;35:*.gl=01;35:*.wmv=01;35:*.aiff=00;32:*.au=00;32:*.mid=00;32:*.mp3=00;32:*.ogg=00;32:*.voc=00;32:*.wav=00;32:
LD_LIBRARY_PATH=/home/jpli/software/intel/impi/3.2.0.011/lib64:/home/jpli/software/intel/Compiler/11.1/072/lib/intel64:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t:/home/jpli/software/intel/Compiler/11.1/072/lib/intel64:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t:/usr/lib64/mpi/gcc/openmpi/lib64
XNLSPATH=/usr/share/X11/nls
NCARG_BIN=/software/ncarg-pgi/bin
ENV=/etc/bash.bashrc
CPATH=/home/jpli/software/intel/Compiler/11.1/072/mkl/include:/home/jpli/software/intel/Compiler/11.1/072/mkl/include
HOSTTYPE=x86_64
GASCRP=/software/grads/lib
FROM_HEADER=
PAGER=less
CSHEDIT=emacs
XDG_CONFIG_DIRS=/etc/xdg
NLSPATH=/home/jpli/software/intel/Compiler/11.1/072/lib/intel64/locale/%l_%t/%N:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t/locale/%l_%t/%N:/home/jpli/software/intel/Compiler/11.1/072/idb/intel64/locale/%l_%t/%N:/home/jpli/software/intel/Compiler/11.1/072/lib/intel64/locale/%l_%t/%N:/home/jpli/software/intel/Compiler/11.1/072/mkl/lib/em64t/locale/%l_%t/%N:/home/jpli/software/intel/Compiler/11.1/072/idb/intel64/locale/%l_%t/%N
PGI=/software/pgi
MINICOM=-c on
MAIL=/var/mail/jpli
PATH=/home/jpli/bin:/software/matlab/R2009b/bin/:/software/R/bin:/software/grads/bin:/home/jpli/software/netcdf-intel/bin:/software/ncarg-pgi/bin:/home/jpli/software/intel/impi/3.2.0.011/bin64:/home/jpli/software/intel/Compiler/11.1/072/bin/intel64:/home/jpli/software/intel/Compiler/11.1/072/bin/intel64:/software/pgi/linux86-64/7.1-6/bin:/software/pgi/linux86-64/7.1/mpi/mpich/bin:/usr/lib64/mpi/gcc/openmpi/bin:/home/jpli/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib64/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin:/usr/lib/qt3/bin:/home/jpli/software/ncview-1.93g/bin:.:/data4/jpli/rsm/libs_single/etc
CPU=x86_64
JAVA_BINDIR=/usr/lib64/jvm/jre/bin
INPUTRC=/home/jpli/.inputrc
PWD=/home/jpli
NCARG_ROOT=/software/ncarg-pgi
JAVA_HOME=/usr/lib64/jvm/jre
NCARG=/software/ncarg-pgi
LANG=en_US.UTF-8
PYTHONSTARTUP=/etc/pythonstart
PGRSH=ssh
NCARG_LIB=/software/ncarg-pgi/lib
QT_SYSTEM_DIR=/usr/share/desktop-data
SHLVL=1
HOME=/home/jpli
LESS_ADVANCED_PREPROCESSOR=no
OSTYPE=linux
LS_OPTIONS=-N --color=tty -T 0
WINDOWMANAGER=/usr/bin/kde
NETCDF=/home/jpli/software/netcdf-intel
address@hidden,UTF-8,ISO-8859-15,CP1252
LESS=-M -I
MACHTYPE=x86_64-suse-linux
LOGNAME=jpli
CVS_RSH=ssh
GADDIR=/software/grads/dat
XDG_DATA_DIRS=/usr/share:/etc/opt/kde3/share:/opt/gnome/share:/opt/kde3/share
SSH_CONNECTION=172.16.102.36 54010 192.168.0.101 22
LESSOPEN=lessopen.sh %s
INFOPATH=/usr/local/info:/usr/share/info:/usr/info
DISPLAY=localhost:12.0
INCLUDE=/home/jpli/software/intel/Compiler/11.1/072/mkl/include:/home/jpli/software/intel/Compiler/11.1/072/mkl/include
XAUTHLOCALHOSTNAME=databank
LESSCLOSE=lessclose.sh %s %s
G_BROKEN_FILENAMES=1
I_MPI_ROOT=/home/jpli/software/intel/impi/3.2.0.011
JAVA_ROOT=/usr/lib64/jvm/jre
COLORTERM=1
mc=() {  . /usr/share/mc/bin/mc-wrapper.sh
}
OLDPWD=/home/jpli/coreutils-8.5/man
_=/usr/bin/env
address@hidden:~> uname -a
Linux databank 2.6.27.7-9-default #1 SMP 2008-12-04 18:10:04 +0100 x86_64 
x86_64 x86_64 GNU/Linux
address@hidden:~> date --version
date (GNU coreutils) 6.12
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by David MacKenzie.
address@hidden:~> lsb_release -a
LSB Version: 
core-2.0-noarch:core-3.2-noarch:core-2.0-x86_64:core-3.2-x86_64:desktop-3.2-amd64:desktop-3.2-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.2-amd64:graphics-3.2-noarch
Distributor ID: SUSE LINUX
Description: openSUSE 11.1 (x86_64)
Release: 11.1
Codename: n/a

I've tried other machines with a different operating system(RHEL), and the 
core-utils versions at these systems differ(5.97, 5.2.1), The newest version of 
gnu core-utils was downloaded and compiled on the SUSE machine I use.
Whatever means I try, the same problem appear. So I assumed this to be a bug.

I'm from china by the way, and the time zone I am in and to which the systems 
were set is GMT8(or CST, China Standard Time).
 
Would you please check over the problem.
 I've not looked at any "Known Bugs" list because I didn't find one. If the 
problem happens to appear on the list.Would you please send me one.

The Script:
#!/bin/bash
st_year="1991"
st_month="04"
st_day="15"
ed_year="1991"
ed_month="09"
ed_day="01"
ed_date=$ed_year$ed_month$ed_day
year=$st_year
month=$st_month
day=$st_day
while true
do
    cur_date="$year$month$day"
    echo $cur_date
    if [ "$cur_date" = "$ed_date" ]
    then
        break
    fi
    nex_date=$(date +%Y%m%d -d "$year-$month-$day +1 day")
    year=$(echo $nex_date | cut -c1-4)
    month=$(echo $nex_date | cut -c5-6)
    day=$(echo $nex_date | cut -c7-8)
done
--

Jiapeng Li(address@hidden)
 
Dpeartment of Atmospheric Sciences
Nanjing University
Hankou Road 22
Nanjing, Jiangsu, China



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