Sitemap Syntax Help Please

[Budget101]

Currently the sitemap pulls "updated dates" for the CMS from the cms_node field.

I'd like to remove the current line from the sitemap:

$content .= "\n\t" . '<lastmod>' . gmdate(DATE_W3C, $sitemap['lastmod']) . '</lastmod>';

and replace it with code that forces the <lastmod> date to be the CURRENT Date (as of the moment of sitemap generation)

Would this one work?

$content .= "\n\t" . '<lastmod>' .Y-m-d\TH:i:s+00:00. '</lastmod>';

Could someone help me out with the correct syntax please??