Posts Per Category by date range

This is possible, but there are a number of ways that the list of posts can be modified, as well as various ways that a feature like this could be implemented, so I’m not sure it’s a good candidate for integration into this particular plugin at the moment.

That being said, if you just want all categories to only show posts from the last 7 days and you’re comfortable dropping a small snippet of code into your functions.php file, we can probably come up with something.

It ended up being a little more code than I thought (mostly comments to explain how it works), but let me know if this does what you want.

– Brady

/**
 * Attach a hook during main category queries.
 *
 * Determine if the current query is the main query and if it's for a
 * category archive. If so, select all posts and attach a hook to filter
 * the SQL WHERE clause. All posts are retrieved in case there are more
 * posts in the past week than the number shown by default.
 *
 * @param object $query WP_Query object passed by reference.
 */
function constantsorrow_pre_get_posts( $query ) {
	if ( ! is_admin() && is_category() && $query->is_main_query() ) {
		// Show all posts.
		$query->set( 'posts_per_page', -1 );

		// Attach hook to filter WHERE clause.
		add_filter( 'posts_where', 'constantsorrow_limit_to_past_week' );

		// Remove the filter after it is executed.
		add_action( 'posts_selection', 'constantsorrow_remove_limit_to_past_week_filter' );
	}
}
add_action( 'pre_get_posts', 'constantsorrow_pre_get_posts' );

/**
 * Filter the SQL WHERE clause to limit the query to grabbing posts from the
 * past week.
 *
 * @param string $where SQL WHERE clause passed from the filter.
 * @return string Modified WHERE clause.
 */
function constantsorrow_limit_to_past_week( $where ) {
	// The date 7 days ago.
	// Use current_time() to calculate based on WordPress time instead of server time.
	$date = date( 'Y-m-d', ( current_time( 'timestamp' ) - 60 * 60 * 24 * 7 ) );

	// Append fragment to WHERE clause to select posts newer than the past week.
	$where .= " AND post_date>='" . $date . "'";

	return $where;
}

/**
 * Remove the filter limiting posts to the past week.
 *
 * Remove the filter after it runs so that it doesn't affect any other
 * queries that might be performed on the same page (eg. Recent Posts
 * widget).
 */
function constantsorrow_remove_limit_to_past_week_filter() {
	remove_filter( 'posts_where', 'constantsorrow_limit_to_past_week' );
}