how to export table to csv and keep date index in matlab

To export a table to a csv file with date index, you can use the writetable function in Matlab. Here's an example of how to do it:

main.m
% create a sample table
dates = datetime('now'):days(1):datetime('now')+6;
data = rand(7,3);
T = array2table(data, 'VariableNames', {'Var1', 'Var2', 'Var3'}, 'RowNames', string(dates));

% write the table to a csv file
filename = 'mytable.csv';
writetable(T, filename, 'WriteRowNames', true);
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By default, writetable writes the row names as the first column in the csv file. In this example, the row names are dates, which are written as strings. If you want to keep the dates as datetime objects, you can modify the code as follows:

main.m
% write the table to a csv file with date format
filename = 'mytable.csv';
writetable(T, filename, 'WriteRowNames', true, 'DatetimeFormat', 'MM/dd/yyyy');
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In this case, the DatetimeFormat option specifies the format of the datetime values in the csv file. You can modify this format string to suit your needs.