When a parameter is passed to your sql in the dataset of your report, you can change the expression. For example, this is the default code.
=Parameters!StartDate.Value
You can change it, basically the expression is like vb code
="""" + Year(Parameters!StartDate.Value).ToString() + "." + Month(Parameters!StartDate.Value).ToString() + "." + Day(Parameters!StartDate.Value).ToString() + """"
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