You should be able to accomplish that using a [Data Driven Subscription][1]. Implement two parameters in your report: StartDate and EndDate. Then feed them values from the database through the subscription (or just hard-code the parameter values in the subscription).
You'll probably have to create one subscription for each date when the report should run.
More info: [Lesson 3: Defining a Data-Driven Subscription][2]
[1]: http://msdn.microsoft.com/en-us/library/ms159150.aspx
[2]: http://msdn.microsoft.com/en-us/library/89197b9b-7502-4fe2-bea3-ed7943eebf3b
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