Show the day in the heading on Genesis archives, even if an archive has no posts

functions.php

<?php
remove_action( 'genesis_archive_title_descriptions', 'genesis_do_archive_headings_headline', 10, 3 );
add_action( 'genesis_archive_title_descriptions', 'custom_do_archive_headings_headline', 10, 3 );
/**
 * Adapts archive title to display a date even for days in custom post types that have no posts.
 *
 * @param string $heading    Optional. Archive heading, default is empty string.
 * @param string $intro_text Optional. Archive intro text, default is empty string.
 * @param string $context    Optional. Archive context, default is empty string.
 */
function custom_do_archive_headings_headline( $heading = '', $intro_text = '', $context = '' ) {
	if ( is_day() ) {
		$date      = sprintf(
			"%s-%s-%s",
			get_query_var( 'year' ),
			get_query_var( 'monthnum' ),
			get_query_var( 'day' )
		);
		$date_text = strtotime( $date );
		$heading   = __( 'Archives for ', 'genesis' ) . date( get_option( 'date_format' ), $date_text );
	}

	if ( $context && $heading ) {
		printf( '<h1 %s>%s</h1>', genesis_attr( 'archive-title' ), esc_html( wp_strip_all_tags( $heading ) ) );
	}
}