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I want to change the order of a feed using pre_get_posts filter. But I want to exclude dates older than today. I see how one could do that if the date were in a meta key, but the date is in post_date. How can I check post_date to only show posts later than today? The site shows future post dates.

is_feed) { $query->set('order','ASC'); } return $query; } add_filter('pre_get_posts','feedFilter'); ?>
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2 Answers 2

You can't really check post_date in pre_get_posts, because, well, the action fires before (pre_...) the posts have actually been fetched (...get_posts). :)

But, you can use $query->set() to add date parameters to the query. This is taken from an example in the WP_Query() Codex entry:

<?php
function wpse54142_filter_pre_get_posts( $query ) {
    if ( is_feed() ) {
        $today = getdate();
        $query->set( 'year', $today['year'] );
        $query->set( 'monthnum', $today['mon'] );
        $query->set( 'day', $today['mday'] );
    }
    return $query;
}
add_filter( 'pre_get_posts', 'wpse54142_filter_pre_get_posts' );
?>
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correct me if I'm wrong, but this only shows posts on that day, not into the future from that day. –  Milo Jun 4 '12 at 14:04
    
From the OP: "But I want to exclude dates older than today.". Why would an RSS feed ever need to show future posts? –  Chip Bennett Jun 4 '12 at 14:08
    
I don't know, but also from the OP: "The site shows future post dates" –  Milo Jun 4 '12 at 14:09

Here's an example using a posts_where filter:

function wpa54142_feed_filter( $query ) {
    if ( $query->is_feed ) {
        $query->set( 'order', 'ASC' );
        add_filter( 'posts_where', 'wpa54142_filter_where' );
    }
    return $query;
}
add_filter( 'pre_get_posts', 'wpa54142_feed_filter' );

function wpa54142_filter_where( $where = '' ) {
    $today = date( 'Y-m-d' );
    $where .= " AND post_date >= '$today'";
    return $where;
}
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