Check post_date in pre_get_posts

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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