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I presume you are referring to the submission date and time shown in the submissions page?
Unfortunately, it is not possible to remove or split the submission date and time from our submissions page, you can however, download a copy of the submission and format the "Submission Date" column to only show the date.
Here you can format the column to show only the date, without the time stamp.
Another way is to integrate the form in Google Spreadsheet, that allows you to do the same formatting in the excel application.
I hope that helps.