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#ident	"@(#)sadmin:admin/menu/syssetup/datetime	2.5"
#menu# set the date, time, time zone and daylight savings time
#help# 
#help#	Datetime tells the computer the date, time, time zone and whether
#help#	you observe Daylight Savings Time (DST).  It is normally run once
#help#	when the machine is first set up.  If you observe DST, the
#help#	computer will automatically start to observe it in the spring and
#help#	return to Standard Time in the fall.
#help#	Any logins and processes running when the time zone changes, and
#help#	all their child processes, will continue to see the old time zone.
#help#	The cron will be restarted with the new time and time zone if it was
#help#	already running.

flags="-qq -k$$"
trap 'exit 0' 1 2 15

timechanged=

if [ -r /etc/TIMEZONE ]
then
	. /etc/TIMEZONE
fi

echo '
Current time and time zone is: '`date | sed '	s/^...........//
						s/:[0-9][0-9] / /
						s/.....$//'`

if checkyn ${flags} -H'
	This procedure allows you to have all times reported in your local
	time zone and allows you to say whether or not to observe Daylight
	Savings Time.  If you observe DST, the computer will automatically
	start to observe it in the spring and return to Standard Time in the
	fall.
	Any logins and processes running when the time zone changes, and
	all their child processes, will continue to see the old time zone.
	The cron will be restarted with the new time and time zone if it was
	already running.' \
	-f 'Change the time zone?'
then
	echo '
	Available time zones are...
	1.  Greenwich (GMT)
	2.  Atlantic  (AST & ADT)
	3.  Eastern   (EST & EDT)
	4.  Central   (CST & CDT)
	5.  Mountain  (MST & MDT)
	6.  Pacific   (PST & PDT)
	7.  Yukon     (YST & YDT)
	8.  Alaska    (AST & ADT)
	9.  Bering    (BST & BDT)
	10. Hawaii    (HST)
	11. Europe    (MET)'

	# check for valid response
	zonenum=`checklist ${flags} -ef 'Enter zone number:' 1 2 3 4 5 6 7 8 9 10 11`

	case "${zonenum}" in
	'1')	tz="GMT0"	;;
	'2')	tz="AST4"	;;
	'3')	tz="EST5"	;;
	'4')	tz="CST6"	;;
	'5')	tz="MST7"	;;
	'6')	tz="PST8"	;;
	'7')	tz="YST8"	;;
	'8')	tz="AST10"	;;
	'9')	tz="BST11"	;;
	'10')	tz="HST10"	;;
	'11')	tz="MET-1"	;;
	esac

	dst=
	case "${tz}" in
	GMT0 | HST10 )
		;;
	* )
		echo
		if checkyn ${flags} -H'
	If you observe DST, the computer will automatically start to observe it
	in the spring and return to Standard Time in the fall.' \
		-f 'Does your time zone use Daylight Savings Time during the year?'
		then
			dst=`expr "${tz}" : '\(.\)'`DT
		fi
	esac

	TZ=${tz}${dst}

	echo "# established `date`
	TZ=${TZ}
	export TZ" >/etc/TIMEZONE  ||
	{
		admerr `basename $0` 'Time zone has not been changed.  Cannot write /etc/TIMEZONE.'
		exit 1
	}
	export TZ
	echo 'Time zone now changed.
Note:  Any logins and processes running when the time zone changes, and
all their child processes, will continue to see the old time zone.
The cron will be restarted at the end of this procedure.'
	timechanged=yes
fi

eval `date +'day=%a. dmon=%m dday=%d dyr=%y dhr=%H dmin=%M'`
echo "Current date and time:  ${day} ${dmon}/${dday}/${dyr} ${dhr}:${dmin}"
if checkyn ${flags} -H'
	This procedure allows you to set the date and time that the computer
	reports.
	The cron will be restarted with the new time and time zone if it was
	already running.' \
	-f 'Change the date and time?'
then
	while true
	do
		while	echo "Month	default ${dmon}	(1-12): \c"
		do
			read month
			case "${month}" in
			'' )
				month=${dmon}
				break
				;;
			q )
				exit 0
				;;
			[0-9] | [0-9][0-9] )
				if [ "${month}" -ge 1  -a  "${month}" -le 12 ]
				then
					break
				fi
				;;
			[Jj][Aa][Nn]* )	month=1
					break;;
			[Ff][Ee][Bb]* )	month=2
					break;;
			[Mm][Aa][Rr]* )	month=3
					break;;
			[Aa][Pp][Rr]* )	month=4
					break;;
			[Mm][Aa][Yy]* )	month=5
					break;;
			[Jj][Uu][Nn]* )	month=6
					break;;
			[Jj][Uu][Ll]* )	month=7
					break;;
			[Aa][Uu][Gg]* )	month=8
					break;;
			[Ss][Ee][Pp]* )	month=9
					break;;
			[Oo][Cc][Tt]* )	month=10
					break;;
			[Nn][Ee][Vv]* )	month=11
					break;;
			[Dd][Ee][Cc]* )	month=12
					break;;
			esac
			echo '	Invalid month:  use 1 through 12'
		done
		while	echo "Day	default ${dday}	(1-31): \c"
		do
			read day
			case ${day} in
			'' )
				day=${dday}
				break
				;;
			q )
				exit 0
				;;
			[0-9] | [0-9][0-9] )
				if [ "${day}" -ge 1  -a  "${day}" -le 31 ]
				then
					break
				fi
			esac
			echo '	Invalid day:  use 1 through 31'
		done
		while	echo "Year	default ${dyr}	(70-99):\c"
		do
			read year
			case ${year} in
			'' )
				year=${dyr}
				break
				;;
			q )
				exit 0
				;;
			[0-9][0-9] )
				if [ "${year}" -ge 70  -a  "${year}" -le 99 ]
				then
					break
				fi
			esac
			echo '	Invalid year:  use 70 through 99'
		done
		while	echo "Hour	default ${dhr}	(0-23): \c"
		do
			read hour
			case ${hour} in
			'' )
				hour=${dhr}
				break
				;;
			q )
				exit 0
				;;
			[0-9] | [0-2][0-9] )
				if [ "${hour}" -ge 0  -a  "${hour}" -le 23 ]
				then
					break
				fi
				;;
			[0-9][aApP][mM] | 0[0-9][aApP][mM] | 1[0-1][aApP][mM] )
				case ${hour} in
				*[aA][mM] )
					hour=`expr "${hour}" : '\([0-9]*\)'`
					;;
				* )
					hour=`expr "${hour}" : '\([0-9]*\)' + 12`
				esac
				break
				;;
			noon )
				hour=12
				break
				;;
			midnight )
				hour=0
				break
			esac
			echo '	Invalid hour:  use 0 through 23'
		done
		while	echo "Minute	default ${dmin}	(0-59): \c"
		do
			read minute
			case ${minute} in
			'' )
				minute=${dmin}
				break
				;;
			q )
				exit 0
				;;
			[0-9] | [0-9][0-9] )
				if [ "${minute}" -ge 0  -a  "${minute}" -le 59 ]
				then
					break
				fi
			esac
			echo '	Invalid minute:  use 0 through 59'
		done
		eval `echo "month=${month} day=${day} 
			hour=${hour} minute=${minute} year=${year} "  |
			sed '	s/=\([0-9]\) /=0\1 /g
				s/=00*\([0-9][0-9]\) /=\1 /g'`
		if  checkyn ${flags} -f "Date and time will be set to:  ${month}/${day}/${year} ${hour}:${minute}.  OK?"
		then
			date ${month}${day}${hour}${minute}${year}  || {
				admerr `basename $0` 'Unable to set date.'
				exit 1
			}
			echo 'The date and time are now changed.'
			timechanged=yes
			break
		fi
		echo 'The date and time have not changed.'
		checkyn ${flags} -f 'Try again?'  ||  break
	done
fi
if [ ${timechanged} ]
then
	pid=`ps -e  |  sed -n '/ cron$/s/^ *\([0-9]\{1,\}\) .*/\1/p'`
	if [ "${pid}" ]  &&  kill ${pid}
	then
		sleep 2
		/etc/cron  ||  {
			admerr $0 'Cannot restart cron.'
			exit 1
		}
		echo 'The cron has been restarted to pick up the new time and/or time zone.'
	fi
fi

# Update kernel with local time for DOS programs
if [ -x /etc/setlocal ]
then
	/etc/setlocal
fi
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