[O] Generating clock table for arbitrary date range

[A. Ryan Reynolds]

Is there any way to specify a start and end date for the :block property of a 
clock table? Lately I have often found myself submitting an invoice based upon 
my clock report on Friday evening, only to be called frantically on Saturday 
and having to put in additional hours (this should sound familiar to many 
programmers :)), which I then need to attribute to next week's clock table to 
be submitted on the following invoice. Is there an easy way to do this?
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A. Ryan Reynolds