Operator '+' is not supported for operands of type struct

Trying to get the data for each day separately but getting the error stated above. csv file attached

%patient 1 Day 5
%Formatting the date with time 
glucose1_5.date.Format = 'dd.MM.uuuu HH:mm';
glucose1_5.time.Format = 'hh:mm:ss.S';

%Adding the date with time to the first column 
glucose1_5.date = glucose1_5.date + glucose1_5.time;

%Changing glucose values from mmol/L to mg/dL by multiplying 18
glucose1_5.glucose = glucose1_5.glucose*18;

%plotting 3-5 cycles of glucose data over 6 days
plot(glucose1_5.date,glucose1_5.glucose);
grid on; legend('Patient1, Day5');
xlabel('Date and Time'); ylabel('Serum Glucose Level (mg/dl)');
hold on;

M5 = mean(glucose1_5.glucose)

Answer 1

[VBBV]

glucose1_5.date = [glucose1_5.date  glucose1_5.time];

Try using the above when adding two different formats

[Nathaniel Porter]

Thank you