xmap-2.2.1 not return Last modification date

[malestas]

My site is indexed by the search engine a week ago. Recently established xmap-2.2.1 and XML sitemap page data from the date Last modification no. Tell me please if the cause of this in the XMAP or Last modification date to appear when the robot will go again .

[guilleva]

Xmap is not adding a default last modification date anymore since 2.2. If the extension doesn't provide a last modification date for each item then it won't be included. Before this, Xmap was setting the current date as the last modification date but that is not good for search engines, it's like cheating.

All the article items should provide a last modification date. Please confirm what kind of items on your sitemap doesn't have this date included.

Regards,

Guillermo

[malestas]

Guillermo, my site is s-okon.ru. XMAP's component 2.2.1 doesn't indicate a page of last modification date in XML's format. This is really bad for search engines. How can I correct this error?
http://s-okon.ru/index.php/component/xmap/xml?option=com_xmap&view=xml&id=1&filter_showtitle=1