If all your dates are in one column, you can run this macro in a module to update them all at once:
Sub updateDates()
Dim i, iLastRow As Long
iLastRow = Range("A65536").End(xlUp).Row
For i = 1 To iLastRow
Cells(i, 1).Value = Cells(i, 1).Value
Next i
End Sub
This code assumes your dates are in column A, from row 1 through x. If your data is elsewhere you'll need to change the following:
Red text above are column references. Change those to match your column. (The 1's represent the first column, or A. So column E would be 5, etc.)
Blue text above represents the starting data row. If your data starts in another row, change it to that.
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