<?php
/*
Template Name: Kurse
*/
get_header();

// gets all posts next 30 days ans last 7 days
function kurse_where($where = '')
{
    $where .= " AND post_date >= '".date('Y-m-d', strtotime('-7 days'))."'
            AND post_date <= '".date('Y-m-d', strtotime('+30 days'))."' ";
    return $where;
}
add_filter('posts_where', 'kurse_where');

// parameter: only catagorie "Kurse" and normal order: past top, future down
query_posts("category_name=Kurse&order=asc");

// here the normal code like index.php to list the posts