Is not possible change in LSI I think but perhaps is more easy from Excel at separe the text by columns.
If you open the doc with Excel, you can change automatically before make the changes separating "comas"
In the four step, you can choose the column A of dates, and select Date: DMY (sry for the screenshot in spanish), when you click in Finish the column appear with your desire format and don't need make the change of format.
I don't know if exist any way more quickly for that.
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