Matlab Coder error : converting datetime Format error

I have a problem about Matlab Coder... Actually, The code is correctly run in Matlab, but I want to use Matlab coder. Coder makes error, when I want to change datetime Format. For example, variable DateTime is type of datetime, 2017-05-01 00:00, 2017-05-01 00:15, ...... 2017-09-30 23:45 and I want to change it only year and date like, 20170501, 20170501, ...... , 20170930. That's why I make the code in matlab, d1 = datetime(DateTime, 'Format', 'uuuuMMdd');

DateTime = table2array(datatable(1:row/4,1)); % 2017-05-01 00:00, 2017-05-01 00:15, ...... 2017-09-30 23:45 d1 = datetime(DateTime, 'Format', 'uuuuMMdd'); % 20170501, 20170501, ...... , 20170930

In Matlab, it works correctly. But Matlab Coder can't call the function. I want to know how I can solve this problem...TT

Answer 1

[VBBV]

Use the dateType argument for the datetime function

d1 = datetime(DateTime, 'dateType', 'yyyymmdd'); % use the dateType argument 

instead of

d1 = datetime(DateTime, 'Format', 'uuuuMMdd'); % 20170501, 20170501, ...... , 20170930

[YunJung Choi]

TT it doesn't not work in matlab...TT Coder also...TT The error report said that 'Undefinded function or variable 'processedVarArgin'. The first assignment to a local variable determines its class.'

[VBBV]

it seems you are converting table data to array. Convert the table data to cell array as shown below and then use the Format argument

DateTime = table2cell(datatable(1:row/4,1)));  % convert the table data to cell array
d1 = datetime(DateTime, 'Format', 'yyyyMMdd'); % use the Format argument

Use MM to represent month instead of mm which represents minutes

[YunJung Choi]

In the table, there is datetime type. That's why I use table2array... Because value of type 'datetime' in the table, it can't be convertible to 'cell'.

I have a problem only in Matlab Coder... I want to convert from matlab code to c code. Actually my original code has no problem in matlab, but it happens only when I use Matlab Coder codegen...TT Is the correct solution for Matlab Coder?? TT

[VBBV]

Ok, for some reason, Matlab coder doesnt support datetime functions

D = datetime({'2017-05-01 00:00', '2017-05-01 00:15'})

D = 1×2 datetime array
   01-May-2017 00:00:00   01-May-2017 00:15:00

T = table(D,'VariableNames',{'D'})

T = table
                        D                     
    __________________________________________

    01-May-2017 00:00:00  01-May-2017 00:15:00

DateTime = table2array(T);
d1 = datetime(DateTime, 'Format', 'uuuuMMdd')

d1 = 1×2 datetime array
   20170501   20170501

Answer 2

[Chetan Bhavsar]

Can you try this once

d1 = datestr(datetime, 'yyyymmdd')

d1 = '20221212'

[YunJung Choi]

it still doesn't work... alarm that codegen is not supported datestr method.