graduation date confusion

hi im an IMG from Bangladesh.i have some confusion regarding my graduation date in ecfmg form..
in my university certificate it was written tht i obtained MBBS in that Uni at the examination of july,2011.they issued this certificate on 20th March,2012

i started my internship in nov 2011 and complete in nov 2012.then got my certificate of full registration as a medical practitioner.



then what would be my
1.date you completed for final medical diploma
2.graduation date
3.date medical diploma issued
4.the number of year attended

anyone help me out