I also have this problem, beginning around the first of July- an extra “0” listing at the bottom of the Archives list. I have looked through all the July posts, and most of June just to be sure, both in phpMyAdmin and in the WP Edit Posts section, but I am not seeing a ‘bad’ date- everything looks correctly formed. If the link around the “0” is to /?m=200907 then the ‘bad’ date would have to be on a July post, right?
I am looking in all four columns in phpMyAdmin with dates:
post_date Descending
post_date_gmt
post_modified
post_modified_gmt
Everything is in the correct format, e.g. 2009-07-15 20:49:47
Is this what I should be looking for? Should I be looking anywhere else?
Thanks very much.