Crystal reports - Previous year but same date range

have crystal report where i am passing startdate and enddate to sub report.  In the sub report I have two running totals:

1: Requested Period sales:  uses startdate and enddate of values passed to sub report
2: Previous Period Sales:  want to use same date range but change year -1  

what is the best way to do this?
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I assume you are filtering based on the date

You can get last year with

DateAdd('yyyy',-1, {YourStartDate})

DateAdd('yyyy',-1, {YourEndDate})


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Crystal Reports

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