Sure, I found there information here:
http://www.michigan.gov/documents/mdch/04-17-2014_HITC_Final_454127_7.pdfIts a PDF, and the information was on page 11.
Feb 28th has been the standard "Last Day for Attestation" for a couple of years. They usually end up extending it by a week because the CMS website usually crashes due to overload.