另外，进ubuntu的话，用hwclock --show看的话，也是准确的本地时间。这是为什么啊？
/etc/init.d/hwclock.sh这个文件的内容是
代码： 全选
#!/bin/sh
# hwclock.sh Set and adjust the CMOS clock, according to the UTC
# setting in /etc/default/rcS (see also rcS(5)).
#
# Version: @(#)hwclock.sh 2.00 14-Dec-1998 miquels@cistron.nl
#
# Patches:
# 2000-01-30 Henrique M. Holschuh <hmh@rcm.org.br>
# - Minor cosmetic changes in an attempt to help new
# users notice something IS changing their clocks
# during startup/shutdown.
# - Added comments to alert users of hwclock issues
# and discourage tampering without proper doc reading.
# WARNING: Please read /usr/share/doc/util-linux/README.Debian.hwclock
# or /usr/share/doc/util-linux/README.Debian.hwclock
# before changing this file. You risk serious clock
# misbehaviour otherwise.
### BEGIN INIT INFO
# Provides: hwclock
# Required-Start: mountdevsubfs
# Required-Stop: $local_fs
# Default-Start: S
# Default-Stop: 0 6
### END INIT INFO
FIRST=no # debian/rules sets this to 'yes' when creating hwclockfirst.sh
# Set this to any options you might need to give to hwclock, such
# as machine hardware clock type for Alphas.
HWCLOCKPARS="--directisa“
hwclocksh()
{
[ ! -x /sbin/hwclock ] && return 0
. /etc/default/rcS
. /lib/lsb/init-functions
verbose_log_action_msg() { [ "$VERBOSE" = no ] || log_action_msg "$@"; }
[ "$GMT" = "-u" ] && UTC="yes"
case "$UTC" in
no|"") GMT="--localtime"
UTC=""
if [ "X$FIRST" = "Xyes" ] && [ ! -r /etc/localtime ]; then
if [ -z "$TZ" ]; then
log_action_msg "System clock was not updated at this time"
return 1
fi
fi
;;
yes) GMT="--utc"
UTC="--utc"
;;
*) log_action_msg "Unknown UTC setting: \"$UTC\""; return 1 ;;
esac
case "$BADYEAR" in
no|"") BADYEAR="" ;;
yes) BADYEAR="--badyear" ;;
*) log_action_msg "unknown BADYEAR setting: \"$BADYEAR\""; return 1 ;;
esac
case "$1" in
start)
if [ -w /etc ] && [ ! -f /etc/adjtime ] && [ ! -e /etc/adjtime ]; then
echo "0.0 0 0.0" > /etc/adjtime
fi
if [ ! -w /etc/adjtime ]; then
NOADJ="--noadjfile"
else
NOADJ=""
fi
if [ "$FIRST" != yes ]; then
# Uncomment the hwclock --adjust line below if you want
# hwclock to try to correct systematic drift errors in the
# Hardware Clock.
#
# WARNING: If you uncomment this option, you must either make
# sure *nothing* changes the Hardware Clock other than
# hwclock --systohc, or you must delete /etc/adjtime
# every time someone else modifies the Hardware Clock.
#
# Common "vilains" are: ntp, MS Windows, the BIOS Setup
# program.
#
# WARNING: You must remember to invalidate (delete)
# /etc/adjtime if you ever need to set the system clock
# to a very different value and hwclock --adjust is being
# used.
#
# Please read /usr/share/doc/util-linux/README.Debian.hwclock
# before enablig hwclock --adjust.
#hwclock --adjust $GMT $BADYEAR
:
fi
if [ "$HWCLOCKACCESS" != no ]; then
log_action_msg "Setting the system clock"
# Copies Hardware Clock time to System Clock using the correct
# timezone for hardware clocks in local time, and sets kernel
# timezone. DO NOT REMOVE.
if /sbin/hwclock --hctosys $GMT $HWCLOCKPARS $BADYEAR $NOADJ; then
# Announce the local time.
verbose_log_action_msg "System Clock set to: `date $UTC`"
else
log_warning_msg "Unable to set System Clock to: `date $UTC`"
fi
else
verbose_log_action_msg "Not setting System Clock"
fi
;;
stop|restart|reload|force-reload)
#
# Updates the Hardware Clock with the System Clock time.
# This will *override* any changes made to the Hardware Clock.
#
# WARNING: If you disable this, any changes to the system
# clock will not be carried across reboots.
#
if [ "$HWCLOCKACCESS" != no ]; then
log_action_msg "Saving the system clock"
if [ "$GMT" = "-u" ]; then
GMT="--utc"
fi
if /sbin/hwclock --systohc $GMT $HWCLOCKPARS $BADYEAR; then
verbose_log_action_msg "Hardware Clock updated to `date`"
fi
else
verbose_log_action_msg "Not saving System Clock"
fi
;;
show)
if [ "$HWCLOCKACCESS" != no ]; then
/sbin/hwclock --show $GMT $HWCLOCKPARS $BADYEAR
fi
;;
*)
log_success_msg "Usage: hwclock.sh {start|stop|reload|force-reload|show}"
log_success_msg " start sets kernel (system) clock from hardware (RTC) clock"
log_success_msg " stop and reload set hardware (RTC) clock from kernel (system) clock"
return 1
;;
esac
}
hwclocksh "$@"
/etc/default/rcS里的内容是
代码： 全选
#
# /etc/default/rcS
#
# Default settings for the scripts in /etc/rcS.d/
#
# For information about these variables see the rcS(5) manual page.
#
# This file belongs to the "initscripts" package.
TMPTIME=0
SULOGIN=no
DELAYLOGIN=no
UTC=no
VERBOSE=no
FSCKFIX=n
