get_the_date( string $format = '', int|WP_Post $post = null )

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

	if ( ! $post ) {
		return false;
	}

	if ( '' == $d ) {
		$the_date = mysql2date( get_option( 'date_format' ), $post->post_date );
	} else {
		$the_date = mysql2date( $d, $post->post_date );
	}

	/**
	 * Filters the date a post was published.
	 *
	 * @since WP-3.0.0
	 *
	 * @param string      $the_date The formatted date.
	 * @param string      $d        PHP date format. Defaults to 'date_format' option
	 *                              if not specified.
	 * @param int|WP_Post $post     The post object or ID.
	 */
	return apply_filters( 'get_the_date', $the_date, $d, $post );
}