Originally Posted by 2bet

Google is fully aware of blog posts and dates attached to each. Google October, and you will only find 4,000,000 in which not 1 of them are blogs. If Google was going to rank everyone based on the use of the Month in the blog posts, there would be 1,000,000,000,000,000,000+ results on constant rotation. The fact that it shows up in your webmaster tools does not apply to the algo used in ranking your site based on Keyword Density.