the_weekday_date( string $before = '', string $after = '' )

function the_weekday_date($before='',$after='') {
	global $wp_locale, $currentday, $previousweekday;
	$the_weekday_date = '';
	if ( $currentday != $previousweekday ) {
		$the_weekday_date .= $before;
		$the_weekday_date .= $wp_locale->get_weekday( mysql2date( 'w', get_post()->post_date, false ) );
		$the_weekday_date .= $after;
		$previousweekday = $currentday;
	}

	/**
	 * Filters the localized date on which the post was written, for display.
	 *
	 * @since WP-0.71
	 *
	 * @param string $the_weekday_date
	 * @param string $before           The HTML to output before the date.
	 * @param string $after            The HTML to output after the date.
	 */
	$the_weekday_date = apply_filters( 'the_weekday_date', $the_weekday_date, $before, $after );
	echo $the_weekday_date;
}