Problem with setting Date Range Default

[bjplayer]

Using CR 8.5. I want to set a Date Range Parameter to have, effectively, "No Lower Bound" in the "Set Defaults" window so the user doesn't have to check the "No Lower Bound" check box when running the report.

However, the "Set Default Values" screen for a Date Range Parameter appears to take only one value and uses it as a default for both ends of the Date Range. There is apparently no way to set different defaults for both the start and end of the Date Range Parameter. Unless I am missing something.

Thanks