#!/bin/sh

day="$1"
format="$2"
num="$3"

test -z "${num}" && num=1
test -z "${day}" && day=$(date)
test -z "${format}" && format="%a, %b %-d"

IFS=
while read line; do
    echo "$num|$(date +$format -d $day)|$line"
    num=$((num+1)) 
    day="$day +1 week"
done