Error in conversion of dates to empty year vectors.

Hello,

I'm VERY new to coding in MatLab.

I am trying to create a time series to compare two data sets.

I'm stuck on my second data set and wonder if anyone may offer me some advice.

The dates for my sample point are in the top row of an excel file, with count number in each column which I want to sum for each date cumulatively for the time series.

I've made a storage space for each year, with 365 zeros. I'm trying to convert the dates so that they fill in the appropriate zeros in the storage space.

[num, txt, raw] = xlsread(filename,'B1:Z1');

TSP_Dates = txt;

% Convert to Day of Year

    date_components = datevec(TSP_Dates,'dd/mm/yyyy');

    day_1_TSP_Dates = date_components;

    day_1_TSP_Dates(:,2:3)= 1;

    day_of_year = datenum(date_components) - datenum(day_1_TSP_Dates)+1;

It keeps getting stuck on the conversion to the day of the year, and giving me this message

Error using dtstr2dtvecmx Failed on converting date string to date number.

Error in datevec (line 117) y = dtstr2dtvecmx(t,icu_dtformat);

Error in SmithPeriodDataTrial (line 29) date_components = datevec(TSP_Dates,'dd/mm/yyyy');

Does any one have any suggestions or advice? I'm very new to all of this.

Thank you for any help! :)