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#From: damatex@CAM.ORG (Mario Boudreault)
#Newsgroups: comp.unix.shell
#Subject: JULIAN DATE CONVERSION SUB
#Date: 4 Aug 1995 10:23:28 -0400
#Message-ID: <3vtah0$jb3@ocean.CAM.ORG>

#For those using shells and who want to convert dates to a julian number
#here is a shell script (wihtout validation) that can be used as a base
#program for your shell scripts.

#Special thanks to Ed Ferguson@ti.com who sent me the algorithm to compute
#that date.

#
# MODIFIED BY CHET RAMEY TO CONVERT TO bash v2 SYNTAX
#

# cnvdate - Conversion de dates en julienne et vice et versa...
#
# Par : Mario Boudreault       Damatex Inc   Montreal, Canada
# Date: 2 Aout 1995
# Rev.:  2 Aout 1995
#
# Usage:
#          cvdate [-j] YYYMMDD		pour convertir en nbre de jours
#          cvdate -d {julian number}	pour convertir en AAAAMMJJ
#

jul_date()
{
	#
	# Separe ANNEE, MOIS et JOUR...
	#
	YEAR=`echo $DATE | awk ' { print substr($0,1,4) } '`
	MONTH=`echo $DATE | awk ' { print substr($0,5,2) } '`
	DAY=`echo $DATE | awk ' { print substr($0,7,2) } '`
	#
	# Execute la formule magique...
	#
	A=$(( $DAY - 32075 + 1461 * ( $YEAR + 4800 - ( 14 - $MONTH ) / 12 ) \
        	/ 4 + 367 * ( $MONTH - 2 + ( 14 - $MONTH ) / 12 * 12 ) / 12 - \
		3 * ( ( $YEAR + 4900 - ( 14 - $MONTH ) / 12 ) / 100 ) / 4 ))
	echo $A
}

day_date()
{
	TEMP1=$(( $DATE + 68569 ))
	TEMP2=$(( 4 * $TEMP1 / 146097 ))
	TEMP1=$(( $TEMP1 - ( 146097 * $TEMP2 + 3 ) / 4 ))
	Y=$(( 4000 * ( $TEMP1 + 1 ) / 1461001 ))
	TEMP1=$(( $TEMP1 - 1461 * $Y / 4 + 31 ))
	M=$(( 80 * $TEMP1 / 2447 ))
	D=$(( $TEMP1 - 2447 * $M / 80 ))
	TEMP1=$(( $M / 11 ))
	M=$(( $M + 2 - 12 * $TEMP1 ))
	Y=$(( 100 * ( $TEMP2 - 49 ) + $Y + $TEMP1 ))
	M=`echo $M | awk ' { M=$0 ; if ( length($0) == 1 ) M="0"$0 } END { print M } '`
	D=`echo $D | awk ' { D=$0 ; if ( length($0) == 1 ) D="0"$0 } END { print D } '`
	echo $Y$M$D
}

# main()

if [ $# -eq 1 ]; then
	DATE=$1
	jul_date
elif [ "$1" = '-j' ]; then
	DATE=$2
	jul_date
elif [ "$1" = '-d' ]; then
	DATE=$2
	day_date
fi
#
# Termine
#
exit 0

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