Depending on the used editor, check what is the obtained value - String or DateTime. If it is a string, you will have to create a Date object
or convert the retrieved string before passing it as parameter's value.
In the report configure the report parameter's Type
to be DateTime. Such DateTime parameter can be mapped to a DateTime argument of a data retrieval method through a data source component, if needed. Having all values of DateTime type saves you from casting strings to DateTime manually in the report.
If you need further help, please post details about the value returned by the custom editor. The settings of the Report parameter, and how the parameter is used in the report.
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