Hi users,
at all who want to manipulate the UNIX-Date backwards or forwards.
Move the attachment to idate.sc and give x permissions to the file.
The script idate.sc works from 01.01.1900 since 31.12.2099.

On commandline insert "idate.sc dd.mm.yyyy" and you get the days since 01.01.1900.

or "idate.sc 38179" and you get the date 12.07.2004

!!!!!!!!!!! remember : the dateformat is day.month. year !!!!!!!!!!!!!!!!!
!!!!!!!!!!! ist halt aus Deutschland !!!!!!!!!!!!!!!!!

Use this Example :
############# Example 1 : 100 days backwards from today
################################################## #####
EXAMPLE=100
AKT_DATE=`date '+%d.%m.%Y'`
echo "AKT_DATE from today => "$AKT_DATE
INF_DATE=`idate.sc $AKT_DATE`
echo "Days since 01.01.1900 => "$INF_DATE
NEW_DATE=`expr $INF_DATE - $EXAMPLE`
NEW_DATE=`idate.sc $NEW_DATE`
echo "NEW_DATE "$EXAMPLE" days backwards from today => "$NEW_DATE
echo "."
echo "-------------------------------------------------"
echo "."
############# Example 2 : 100 days forwards from today
################################################## #####
EXAMPLE=100
AKT_DATE=`date '+%d.%m.%Y'`
echo "AKT_DATE from today => "$AKT_DATE
INF_DATE=`idate.sc $AKT_DATE`
echo "Days since 01.01.1900 => "$INF_DATE
NEW_DATE=`expr $INF_DATE + $EXAMPLE`
NEW_DATE=`idate.sc $NEW_DATE`
echo "NEW_DATE "$EXAMPLE" days forwards from today => "$NEW_DATE