Source

File: wp-includes/comment-template.php

function get_comment_time( $format = '', $gmt = false, $translate = true ) {
	$comment = get_comment();

	$comment_date = $gmt ? $comment->comment_date_gmt : $comment->comment_date;

	$_format = ! empty( $format ) ? $format : get_option( 'time_format' );

	$date = mysql2date( $_format, $comment_date, $translate );

	/**
	 * Filters the returned comment time.
	 *
	 * @since 1.5.0
	 *
	 * @param string|int $date      The comment time, formatted as a date string or Unix timestamp.
	 * @param string     $format    Date format.
	 * @param bool       $gmt       Whether the GMT date is in use.
	 * @param bool       $translate Whether the time is translated.
	 * @param WP_Comment $comment   The comment object.
	 */
	return apply_filters( 'get_comment_time', $date, $format, $gmt, $translate, $comment );
}