78 lines
2 KiB
Bash
78 lines
2 KiB
Bash
#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
|