Crystal Reports - printing record selection dates

I have a parameter set up as a string. The user can select different date ranges such as CurrentWeek, LastMonth etc.  In my record select logic I check what was selected on the parameter. If it was Last Month for example, I do the following: Date({MyDateTimeField}) in LastFullMonth. This all works great. What I want to do is print on the report, the starting and ending dates that are in LastFullMonth. Is this possible? Thanks