Work experience calculations

Hello everyone.

Could you pls help me calculate how many months short am I for 3 years.According to my calculations taking into consideration all the days I have 33 months of experience plus some days which makes me short of three months

11 June 2012 - 15 March 2013
28 July 2014 - 18 March 2015
1 June 2015 - 20 Oct 2016

Secondly is it on to have precisely 3 three year work experience

Could you pls help. I have come to India only get the required months of experience. Pls help.