[serendipity_event_google_sitemap] notice for gmstrftime() and warning for isdraft

[bauigel]

I get a lot of notices, when I save a static page and the plugin tries to update the sitemap.

Function gmstrftime() is deprecated in ./plugins/serendipity_event_google_sitemap/serendipity_event_google_sitemap.php on line 171

$str_lastmod = gmstrftime('%Y-%m-%dT%H:%M:%SZ', $lastmod); // 'Z' does mean UTC in W3C Date/Time

ChatGPT told me, that I could use this line:

$str_lastmod = (new DateTime('@' . $lastmod))->setTimezone(new DateTimeZone('UTC'))->format('Y-m-d\TH:i:s\Z');

The second thing is warning for isdraft in line 725

Warning: Undefined array key "isdraft" in ./plugins/serendipity_event_google_sitemap/serendipity_event_google_sitemap.php on line 725.

There has to be an isset added:

725 if (isset($eventData['isdraft']) && serendipity_db_bool($eventData['isdraft']) === false && $do_pingback && $cur_url) {