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Diffstat (limited to 'examples/functions/jdate.bash')
| -rw-r--r-- | examples/functions/jdate.bash | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/examples/functions/jdate.bash b/examples/functions/jdate.bash new file mode 100644 index 0000000..9488ed9 --- /dev/null +++ b/examples/functions/jdate.bash @@ -0,0 +1,78 @@ +#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 |