variable Xtick on bar graph

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hello everyone,

i have this problem: i want to plot on bar figure infomation and wirth below this data the date of any column on the bar. the problem is that the user can choose differnt length of time to see one the graph and its causing to problam (many dates on the Xtick wirte one on the other and think like that). i tried to set that if the user choose more than 8 days so the Xtick will write only 8 days but with proportion between them (for exemple if he choose 16 day so it shoe the dates with jump of 2 days between a couple) but i having trouble to get the right string fo the Xtick. anyone can help? you can see what i done so far to maybe understand better my problem. thanks!

Labels = cellstr(Dates);
NumOfDates = length(Labels);
if NumOfDates < 7
    set(gca,'XTick', 1 : NumOfDates, 'XTickLabel', Labels);
else
    Labels(1) = Dates(1);
    Labels(8) = Dates(end);
   j = 2;
    for i = 1 + round(NumOfDates/8) : round(NumOfDates/8) : NumOfDates
        Labels(j) = Dates(i);
        j = j + 1;
    end
    if strcmp(Labels(end), Labels(end - 1))
        Labels(end  - 1) = Dates(round(length(Dates) - (NumOfDates/8)));
    end
    set(gca,'XTick', 1 : (NumOfDates/8):  NumOfDates, 'XTickLabel', Labels);
end