resolved:
add @ before
strtotime($p[(($cnt-1) * $posts_per_page )]->post_date)) . '"';
=
@strtotime($p[(($cnt-1) * $posts_per_page )]->post_date)) . '"';
it’s work.
i’m calling posts from a link: …WORDPRESS/ARCHIVES/TAG/TAGNAME/
The strange thing is that the error message is showed only in pages with earliest post. What is changed? Nothing apparently…