#!/bin/sh
printf 'Content-Type: text/plain\n\n'
TD=`printf '%s\n' "$QUERY_STRING" | sed -En 's/^.*d=([^&]*).*$/\1/p' | sed 's/%20/ /g; s/+/ /g'`
if [ -z "$TD" ]
then
    printf 'Today is %s (reload to update)\n' `date '+%Y-%j'`
else
    OD=`date -d "$TD" '+%Y-%j' 2>/dev/null`
    if [ -n "$OD" ]
    then
        printf '%s, as an ordinal date, is %s\n' "$TD" "$OD"
    else
        printf '%s is not a valid date\n' "$TD"
    fi
fi