if you cannot change the column format, you can only take the data from excel. Then you can get the substring from each row. So you can get only the first 10 characters and so you have only the date without time.
YourString is the row content. If you do that in For Each Row activity: row(“ColumnName”).ToString.Substring(0,10)
For changing the format of the column into numbers, you can watch this video. You only have to change the format in the code from numbers to date. Search for date format in Google.
Video Link: UiPath | Format Numbers In Excel Column with VB.NET | How to set Number formet to Excel Column - YouTube