Problems with SiteMap after recent updates

V 1.5.2.1

1. site map (http://www.iliatorlin.com/sitemap_index.xml) is no longer viewable in browser (<?xml-stylesheet type=”text/xsl” href=”//www.iliatorlin.com/main-sitemap.xsl”?> is not resolving to anything 🙁
2. after resubmitting sitemap to Google I can see following indexing error:

Errors
Invalid date
An invalid date was found. Please fix the date or formatting before resubmitting.
3
Parent tag: sitemap
Tag: lastmod
1
Mar 13, 2014
Parent tag: sitemap
Tag: lastmod
1
Mar 13, 2014
Parent tag: sitemap
Tag: lastmod
1
Mar 13, 2014

Is it only me having such issues? If yes any ideas what am I doing wrong (Everything worked without problems before update). If no – is it bug? is it going to be fixed?

Regards

https://wordpress.org/plugins/wordpress-seo/