cubicweb-blog #933766 blog entry made on last day of a month are not in the blog archive for that month [validation pending]

on http://www.cubicweb.org/view?rql=Any%20B%2C%20BD%20ORDERBY%20BD%20DESC%20WHERE%20B%20is%20BlogEntry%2C%20B%20creation_date%20BD%2C%20B%20creation_date%20%3E%3D%20%20%222010-04-01%22%2C%20B%20creation_date%20%3C%3D%20%222010-04-30%22&month=4&vtitle=billets%20avril%202010%20%5B6%5D&year=2010 (link for april blogs) I don't see http://www.cubicweb.org/blogentry/931633 (last modified and created on april 30).

priorityimportant
typebug
done in1.9.0
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