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CustomFactor (today)

Hi,
I have question regarding custom factor (see code line below)

class something(CustomFactor):  
         def compute(self, today, asset_ids, out, values):  

As I understand "today" in CustomFactors uses the date from run_pipeline

run_pipeline(my_pipe, '2014-03-03', '2014-05-03')  

in the case above it will use 2014-03-03, I was wondering is it possible to give alternative dates in CustomFactor that are different from the dates on which pipeline runs ?

Just to clarify I am familiar that one could use window_length in order to get past data.