Crystal Report Running Totals between specified dates.

I am designing a Crystal Report for Banking where I need to publish running total between two specified dates. Now I have a problem here. See if I start from 5th of January 2012 and want to publish everything afterward, the opening balance for that calculation will start from 4th of January and before.

I have completed a report that can publish results from the start to end but not when the user specifies a report from a particular date. I will be grateful for any help.