WordPress at a glance
filter is not described

get_comment_date filter-hook . WP 1.5.0

Filters the returned comment date.

Usage

add_filter( 'get_comment_date', 'filter_function_name_5540', 10, 3 );
function filter_function_name_5540( $date, $d, $comment ){
	// filter...

	return $date;
}
$date(string/int)
Formatted date string or Unix timestamp.
$d(string)
The format of the date.
$comment(WP_Comment)
The comment object.

Where the hook is called

get_comment_date()
wp-includes/comment-template.php 554
return apply_filters( 'get_comment_date', $date, $d, $comment );

Where the hook is used (in WP core)

Does not used.