This is not the format for the file name, it is the format for the compiled pages blog post. So this changes the url from http://rgsocbundler.github.io/2013/07/18/week1-day3.html to http://rgsocbundler.github.io/2013-07-18-week1-day3.html Which would break anything that already links to our blog, like the Twitter account or the mention of our blog in the RGSoC blog.