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Ik heb geprobeerd van het toe te passen maar helaas zonder resultaat.
Het enigste wat ik van author en date kan vinden is in archive.php.
Kan iemand me misschien helpen?
Het bestand zit er als volgt uit:

<?php
/**
 * The template for displaying Archive page.
 *
 * @package ThemeGrill
 * @subpackage Accelerate
 * @since Accelerate 1.0
 */
?>
<?php get_header(); ?>
	<?php do_action( 'accelerate_before_body_content' ); ?>
	<div id="primary">
		<div id="content" class="clearfix">
			<?php if ( have_posts() ) : ?>
				<header class="page-header">
					<h1 class="page-title">
						<?php
							if ( is_category() ) :

								single_cat_title();
							elseif ( is_tag() ) :
								single_tag_title();
							elseif ( is_author() ) :
								/* Queue the first post, that way we know

								 * what author we're dealing with (if that is the case).
								*/

								the_post();

								printf( __( 'Author: %s', 'radiate' ), '<span class="vcard">' . get_the_author() . '</span>' );

								/* Since we called the_post() above, we need to
								 * rewind the loop back to the beginning that way
								 * we can run the loop properly, in full.
								 */
								rewind_posts();
							elseif ( is_day() ) :

								printf( __( 'Day: %s', 'radiate' ), '<span>' . get_the_date() . '</span>' );

							elseif ( is_month() ) :

								printf( __( 'Month: %s', 'radiate' ), '<span>' . get_the_date( 'F Y' ) . '</span>' );

							elseif ( is_year() ) :

								printf( __( 'Year: %s', 'radiate' ), '<span>' . get_the_date( 'Y' ) . '</span>' );

							elseif ( is_tax( 'post_format', 'post-format-aside' ) ) :

								_e( 'Asides', 'radiate' );

							elseif ( is_tax( 'post_format', 'post-format-image' ) ) :

								_e( 'Images', 'radiate');

							elseif ( is_tax( 'post_format', 'post-format-video' ) ) :

								_e( 'Videos', 'radiate' );
							elseif ( is_tax( 'post_format', 'post-format-quote' ) ) :

								_e( 'Quotes', 'radiate' );

							elseif ( is_tax( 'post_format', 'post-format-link' ) ) :

								_e( 'Links', 'radiate' );

							else :
								_e( 'Archives', 'radiate' );
							endif;

						?>
					</h1>
					<?php
						// Show an optional term description.

						$term_description = term_description();

						if ( ! empty( $term_description ) ) :

							printf( '<div class="taxonomy-description">%s</div>', $term_description );
						endif;

					?>

				</header><!-- .page-header -->

				<?php while ( have_posts() ) : the_post(); ?>

					<?php get_template_part( 'content', get_post_format() ); ?>

				<?php endwhile; ?>

				<?php get_template_part( 'navigation', 'archive' ); ?>

			<?php else : ?>

				<?php get_template_part( 'no-results', 'archive' ); ?>				

			<?php endif; ?>

		</div><!-- #content -->

	</div><!-- #primary -->

	<?php accelerate_sidebar_select(); ?>

	<?php do_action( 'accelerate_after_body_content' ); ?>

<?php get_footer(); ?>