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: jpli@databank:~> 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 G_FILENAME_ENCODING=@locale,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 jpli@databank:~> 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 jpli@databank:~> date --version date (GNU coreutils) 6.12 Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later 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. jpli@databank:~> 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(lijpbasin@126.com) Dpeartment of Atmospheric Sciences Nanjing University Hankou Road 22 Nanjing, Jiangsu, China 您想拥有和网易免费邮箱一样强大的软件吗？