How do you calculate the MPQ for CPP

For the minimum qualifying period date-how is that calculated.
My husband has worked 27 years so he has to have made contributions for three of the last six years?
He had contributions 2010,2011,2012,2013 and 2015
He has 0 for 2014, 2016 and this year 2017.
So would his MPQ be Dec 2017 or later?
Anyone know?
His application his date of sevre/prolonged is March 2015

Assuming that he made the minimum qualifying CPP-D contributions in those years 2010, 2011 etc, then I believe the MQP would end on December 31, 2016. So, 2016 was the last year he would have had 4 of 6 years of qualifying CPP contributions. You would need to get your statement of CPP contributions from Service Canada Online and you could know for sure. They will also normally tell you the MQP in the initial denial letter if your claim is denied.

Thanks! He has 27 years of contributions so he would qualify for the 3 of the last 6 years, I think-

Possibly but it would be contingent on fact that each of those years met the minimum CPP contribution threshold. Not just 25+ years of contributions, its 25+ years of contributions that each was over the minimum threshold for its year.