Look at this example:
d1=datenum('1997-01-01 00:00','yyyy-mm-dd HH:MM');
d2=datenum('2016-08-31 00:00','yyyy-mm-dd HH:MM');
M=d1:1/24:d2;
d=datevec(M);
[ii,jj,kk]=unique(d(:,1:2),'rows');
out=accumarray(kk,(1:numel(kk))',[],@(x) {d(x,:)})
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