get_the_time( string $d = '', int|WP_Post $post = null )

function get_the_time( $d = '', $post = null ) {
	$post = get_post($post);

	if ( ! $post ) {
		return false;
	}

	if ( '' == $d )
		$the_time = get_post_time(get_option('time_format'), false, $post, true);
	else
		$the_time = get_post_time($d, false, $post, true);

	/**
	 * Filters the time a post was written.
	 *
	 * @since WP-1.5.0
	 *
	 * @param string      $the_time The formatted time.
	 * @param string      $d        Format to use for retrieving the time the post was written.
	 *                              Accepts 'G', 'U', or php date format value specified
	 *                              in 'time_format' option. Default empty.
	 * @param int|WP_Post $post     WP_Post object or ID.
	 */
	return apply_filters( 'get_the_time', $the_time, $d, $post );
}