Well, you aren't posting your softeware version, nor what "pulling it into the report" means in technical terms.
If you place the parameter on the report canvas, it should prompt for it's value, and then display what was entered.
If you mean by it does not display that it isn't filtering rows, you need to go into the Report->Selection Formula->record and palce criteria, such as:
{table.DateTimeField} = {?MyDateTimeParameter}
-k
-k