@Anonymous "still don't work" is not very descriptive. Is there an error message or is the time still being displayed?
Working with Excel as a data source in Power Apps is quite unwieldy, particularly for Date field types.
Consider changing the column type in Excel to Text and then use the below in the DataCard Update property:
Text(DataCardValue1.SelectedDate,"dd/mm/yyyy")
Alternatively and ideally, move your data source to SharePoint or Dataverse.
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Imran-Ami Khan