Bash script - Week of Year

function weekof()
{
    local week=$1 year=$2
    local week_num_of_Mon_1 week_day_of_Mon_1
    local first_Mon
    local date_fmt="+%a %b %d %Y"
    local mon sun

    week_num_of_Mon_1=$(date -d $year-01-01 +%W)
    week_day_of_Mon_1=$(date -d $year-01-01 +%u)

    if ((week_num_of_Mon_1)); then
        first_Mon=$year-01-01
    else
        first_Mon=$year-01-$((01 + (7 - week_day_of_Mon_1 + 1) ))
    fi

    mon=$(date -d "$first_Mon +$((week - 1)) week" "$date_fmt")
    sun=$(date -d "$first_Mon +$((week - 1)) week + 6 day" "$date_fmt")
    # echo "\"$mon\" - \"$sun\""
    echo -e "\n\nFor week no: ${week}"
    echo -e "\t""\"$mon\" - \"$sun\""
    echo -e "\n\n"
}
weekof $1 $2
#
# Run as  bash sed_dt_test.bsh 32 2013
#