RE: date minus one
- From: "Ian Cary (C)" <Ian.Cary@xxxxxxxxxxxxxxxxxxxx>
- To: <jknight@xxxxxxxxxxxxxx>, "oracle-l" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 30 Mar 2005 13:42:22 +0100
I wrote this a few years ago - I think it still works :)
I called it add_days and then executed
add_days -1=20
to get yesterday
Cheers,
Ian
MONTHS=3DJan:Feb:Mar:Apr:May:Jun:Jul:Aug:Sep:Oct:Nov:Dec
MONDAYS=3D31:28:31:30:31:30:31:31:30:31:30:31
TDAY=3D$(date +%e)
TMON=3D$(date +%m)
TYER=3D$(date +%Y)
let LEAP_YEAR=3D$TYER%4
let TOTDAYS=3DTDAY+${1:-0}
MONDAY=3D$(echo $MONDAYS|cut -d: -f$TMON)
if [ $TMON -eq 2 ] && [ $LEAP_YEAR -eq 0 ] && [ $TYER -ne 2000 ]
then
let MONDAY=3D$MONDAY+1
fi
while [ $TOTDAYS -gt $MONDAY ]
do
let TOTDAYS=3D$TOTDAYS-$MONDAY
let TMON=3D$TMON+1
if [ $TMON -eq 13 ]
then
TMON=3D1
let TYER=3D$TYER+1
fi
MONDAY=3D$(echo $MONDAYS|cut -d: -f$TMON)
if [ $TMON -eq 2 ] && [ $LEAP_YEAR -eq 2 ] && [ $TYER -ne 2000 ]
then
let MONDAY=3D$MONDAY+1
fi
done
echo $TOTDAYS $(echo $MONTHS|cut -d: -f$TMON) $TYER
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