Passing 2 date paramters from 2 text box prompts into a single date range prompt

[Shailaja0520]

 i have 2 text box prompts parameters suppose ?pstart? and ?pend? in parent report . i want to concatanate the 2 parameters and pass it to a date range prompt in a detail report.

i should  not do any changes in the detail or child  report.
can anyone tell in what format the parameters(?pstart? and ?Pend?) be concatenated and passed to the single date range parameter
suppose ?pdate? in drill thru report.

Thanks in advance