MrPetreli formulated the question :
I have a very unusual problem with the below code, which for some reason
changes the date format on all cells in my spreadsheet from dd/mm/yyyy
to mm/dd/yyyy. I tried to solve it but not luck with If x.Value =
IsDate(x.Value) Then Exit Sub


Try...

Sub Uppercase()
Application.ScreenUpdating = False
Dim x As Range
For Each x In Selection
If Not IsDate(x.Value) Then x.Value = UCase(x.Value)
Next 'x
Application.ScreenUpdating = True
End Sub

--
Garry

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