How can I show the time on Y axis on Bar graph or Stem graph with datetick ?

Hello,

I have a 20x1 cell array and on each cell there is a time in 'MM:SS.FFF'.

I use datenum to convert it in serial number. Now I would like to use a bar graph or stem graph with numeric values in X axis and those time values in Y Axis.

I use datetick after the plot to convert the value in time text but on my graph there is just '00:00.000' on the Y-axis and if I try to plot in plot graph it's working (I have my time values on Y axis).

My code is (with 'h' a 20x1 cell with time values in text):

    Format  = 'MM:SS.FFF';
    z=[1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 21];
    h1= datenum(h,Format);
    bar(z,h1)
    datetick('y',Format)

Do you have a solution for this problem?

Thank you,

Martin