[amibroker] Fixed Date for Annual Returns

["steve_almond" <me@xxxxxxxxxxxxxxxxxxxxx>]

I would like to do an exploration to calculate simple stock returns, 
but at fixed dates. I don't want to use the Ref function which links 
the return to today's date.

For example:

% return from May/1/2002 to May/1/2003
% return from Feb/1/2004 to Feb/28/2005

How can I specify those dates in an exploration?
I'm guessing I could use Datenum, but how would I ask for the closing 
price on datenum=1011231?

Thanks,

Steve


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