serdates = datenum('19890101', 'YYYYMMDD') : datenum('20191231');
vecdates = datevec(serdates);
decdates = vecdates(:,1) * 10000 + vecdates(:,2)*100 + vecdates(:,3);
datecol = reshape( repmat(decdates(:) .', 7, 1), [], 1);
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