In case you've not checked the calendar (see below) it's 2020 and a the c++ world has moved on from the issue this macro solved. boost date-time also needs to move forward into the decade with a modernized all header code base . If you're dependent on this macro for any reason I'd like to hear about it.

Thanks,

Jeff

using namespace boost::gregorian;
date today = day_clock::local_day();

cout << today.year() << endl; //2020 ;)