This will do it:
% Define the cell array of filenames.
caFileNames = {...
'1-Apr-16.fullfeed'
'1-Aug-16.fullfeed'
'1-Feb-16.fullfeed'
'1-Jan-16.fullfeed'
'1-Jul-16.fullfeed'
'1-Jun-16.fullfeed'
'1-Mar-16.fullfeed'
'1-May-16.fullfeed'
'1-Oct-16.fullfeed'
'1-Sep-16.fullfeed'
'10-Apr-16.fullfeed'
'10-Aug-16.fullfeed'
'10-Feb-16.fullfeed'
'10-Jan-16.fullfeed'
'10-Jul-16.fullfeed'
'10-Jun-16.fullfeed'
'10-Mar-16.fullfeed'
'10-May-16.fullfeed'
'10-Sep-16.fullfeed'
'11-Apr-16.fullfeed'
'11-Aug-16.fullfeed'
'11-Feb-16.fullfeed'
'11-Jan-16.fullfeed'}
months = {'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'};
daysPerMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
% Turn each filename into a day of the century.
for k = 1 : length(caFileNames)
% Split filename apart into pieces.
theseWords = strsplit(caFileNames{k}, '-');
% Determine what month number it is.
[ia, monthNumber] = ismember(theseWords{2}, months);
% See what day of the current year it is.
if monthNumber == 1
dayOfYear = str2double(theseWords{1});
else
dayOfYear = sum(daysPerMonth(1:monthNumber-1)) + str2double(theseWords{1});
end
% Determine what day of the century it is.
dayOfCentury(k) = str2double(theseWords{3}(1:2)) * 356 + dayOfYear;
end
[sortedDays, sortOrder] = sort(dayOfCentury, 'ascend');
% Get the final sorted cell array
new_ca = caFileNames(sortOrder)
I bet Stephen Cobeldick would change his program to handle that if you contact him.
