datetime error in 2025a version

Hi,

I have been using a program using 2019a version with no problem. After upgrading to 2025a, the datetime function is giving me problems. What has changed since 2019a?. Here is the code

Raw_Table.Date = datetime(My.Date, 'convertfrom', 'datestr', 'format', 'eee yyyy MMM dd');

where

My.Date
ans = 

  3×1 datetime array

   2025-06-04
   2025-06-05
   2025-06-06

I get the following error:

Error using datetime (line 198)
Input data must be one numeric matrix when converting from a different date/time representation.

Thanks.

Answer 1

[Star Strider]

I may be missing something, however it appears that 'My.Date' is already a datetime array.

You do not need to do anything to it, however it is relatively easy to change its format.

Try smething like this --

My.Date = datetime([2025 06 04; 2025 06 05; 2025 06 06], Format='yyyy-MM-dd');
My.Date                                                                             % Original

ans = 3×1 datetime array
   2025-06-04
   2025-06-05
   2025-06-06

My.Date.Format='eee yyyy MMM dd';
My.Date                                                                             % New Format

ans = 3×1 datetime array
   Wed 2025 Jun 04
   Thu 2025 Jun 05
   Fri 2025 Jun 06

.

[Hossein]

You are correct. I did not notice it. The program downloads data using an API and in 2019a, the downloaded dates used to be in a different format. So, something has changed between 2019a and 2025a, but my problem has gone away by commenting out that line. Thanks

[Star Strider]

My pleasure!

Answer 2

[Walter Roberson]

'convertfrom' 'datestr' is not a supported option

https://www.mathworks.com/help/matlab/ref/datetime.html#d126e368859

If you have date strings then you leave out the 'convertfrom' option.

But it does not appear that you have date strings. You have datetime objects. There are no versions of datetime() that accept datetime objects.

If you want to change the Format then just do

Raw_Table.Date = My.Date;
Raw_Table.Date.Format = 'eee yyyy MMM dd';