Thank you for your question.
It is a known issue in the current version of RadGridView. We will address it in a next version.
Meantime, you can implement a custom RadDateTimeEditor
which defines the format string that you need:
CustomRadDateTimeEditor : RadDateTimeEditor
Please use the EditorRequired
event to change the used editor for the GridViewDateTimeColumn
sender, EditorRequiredEventArgs e)
I hope it helps.
the Telerik team
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