You can find the ieeetran bibtex style at the link. While there is no 'access time' field, there is a 'note' field for many of the document types which may suit your purpose.
I'm using the breakurl package and the hyperref package with pdfLatex and BibTeX to cite a url. The url is breaking, but not according to my margins. Is there any way I can make the url recognize my margins or …