fix reminder.calctime

[http://dummy.us.eu.org/robert (Robert)]

if expr "$TIME" : '20[0-9][0-9]'>/dev/null; then
                if date -d "$TIME" +%Y%m%d >/dev/null 2>&1; then
                        DATE=`date -d "$TIME" +%Y%m%d`
                        SDATE=`date -d "$TIME" +%Y/%m/%d`
                fi