MATLAB: How improve for cycle with sequential variables name and time evaluate

time names names variables dates

I've this for cycle:
for k =1:3 %numel(D)
      fid = fopen(fullfile(D(k).name), 'rt');
      filename = D(k).name ;
      a=filename(11:end);
      b=regexp(a,'__','split');
      out1=cellfun(@(x) datestr(datenum(x(1:10),'yyyy_mm_dd'),'yyyy/mm/dd'),b,'un',0);
      out2=cellfun(@(x) datestr(datenum(x(12:end),'HH_MM'),'HH:MM'),b,'un',0);
      out=[out1'  out2'];
      clearvars out1 out2;
      fclose(fid);
  end
I want to assign a cumulative name at the variables 'out' like 'out-1', 'out-2', … for each for cycle. I try do that with this code:
t1 = cell(numel(D), 1);
 t2 = cell(numel(D), 1);
 for j=1:numel(D);
 t1{j} = sprintf('TimeStart %u', j);
 t2{j} = sprintf('TimeFinish %u',j);
 end
But I don't now how put this code in the for cycle.
I need to evaluate che difference between two dates & times, and for do that I use this code:
prova = [out{1,1}, ' ', out{1,2}];
prova2 = [out{2,1}, ' ', out{2,2}];
format shortg;
t1 = datevec(prova,'yyyy/mm/dd HH:MM');
t2 = datevec(prova2,'yyyy/mm/dd HH:MM');
e=etime(t2, t1)
I need to do that with a iterative cycle, for each cell and create a file with the column of results.
Thanks in advance.
Stefano
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