Subreport Paramenter need to inherit parent

[JSmith3]

What do I select so that the fields in the subreport inheret the date range from the parent?? View Attachment.

[jade1977]

What I think is happening is that on one report the field is a datetime and on the other it is a date. If you make them both the same type, you'll then see the field listed in the Select data based on field area.