How do I bake relative dates into a data set in SSRS?

I'm trying to create a report that will a开发者_如何学JAVAlways show yesterday's numbers but the SSRS documentation is weak on examples in this area. Yesterday is one of the relative date values for use as filter criteria - but where?

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Use a hidden parameter on the report, which is given a default value of:

dateadd("d",-1,today())