How can I save custom date formats to the Input Tool dialog in MATLAB R2022b?

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MathWorks Support Team
回答： MathWorks Support Team 2023-3-13
Is there a way to save (or set) custom datetime formats in the Import Tool dialog so that they can be reused after restarting MATLAB R2022b and/or Import Tool? My use case is that I often need to enter the following custom format:
yyyy.DDD.HH:mm:ss
It would be helpful to have that appear as a custom option at the top of the list after it has been used. It does that now if I don't close the Import Dialog, but it doesn't reappear if I close the Import Dialog or restart MATLAB. I would prefer to have a persistent list of the most recently used formats instead of (or at the top of) the existing list of sample formats.
The image below shows the custom datetime format that I have created, which I would like to remain persistent:

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MathWorks Support Team
A way to use custom formats is to import your data programmatically. This would involve importing a data file using code that performs custom date formatting without having to manually specify it. For example, for the following “datafile.txt” file:
2000.003.06:09:12
2001.004.07:10:13
2002.005.08:11:14
You can use the “readtable” MATLAB function and its “Format” property to specify a custom date format as follows:
T = readtable("datafile.txt", "Delimiter", " ", "Format", "%{yyyy.DDD.HH:mm:ss}D %d");
For more information regarding the “readtable” function, please refer to the documentation linked below:
https://www.mathworks.com/help/releases/R2022b/matlab/ref/readtable.html
Saving the custom format in the graphical interface is something our development teams are considering for future MATLAB releases.

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