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Issue with loading datetime from table

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Sue MM
Sue MM on 23 Jul 2019
Answered: Eric Sofen on 29 Jul 2019
Hi, I have a simple 3 column CSV file with column 1 = names, column 2= address column = dates. I load the CSV using readtable()
Data= readtable(FileMaker.csv);
C = table2cell(data)
Dates = C(:,3)
DateId = datetime(dates)
However I keep getting the error using datetime(639) input data must be numeric array, string array, cell array containing character vectors, or char matrix.
The cell for dates is showing up as a datetime when I look at the workspace but I’m not sure how to overcome the error message. Any help would be greatly appreciated!

  2 Comments

madhan ravi
madhan ravi on 23 Jul 2019
FYI , the below is not a valid MATLAB syntax
Dates = C(:,)
Sue MM
Sue MM on 23 Jul 2019
Typo in the question meant C(:,3)

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Answers (2)

Joel Handy
Joel Handy on 23 Jul 2019
Edited: Joel Handy on 23 Jul 2019
There appears to be two issues with your code. The first is that datetime doesn't take a cell array of numbers so you need to convert the cell array containing datetimes to a numeric array. The second issue is that datetime needs you to explicitly tell it that you are giving it datenums. I think the following code will work for you.
Dates = [C{:,3}];
% OR
Dates = cell2mat(C(:,3));
DateId = datetime(Dates, 'ConvertFrom', 'datenum')

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Eric Sofen
Eric Sofen on 29 Jul 2019
There's no reason to go through cell to pass the datenums into datetime:
Data = readtable(FileMaker.csv);
Dates = datetime(Data.Var3, 'ConvertFrom', 'datenum') % assuming default variable names in the table.

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