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Pack weblog -- prolog/info/stock/crox/croxstock.pl
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 crstock_stats(+Market:atom, +Stat:atom, +Date:term, -Value:float) is semidet
@Market must be djia @Stat must be opening @Date is of the form yy-mm-dd where mm, dd, and yy are ints @Value bound to the value of the DJIA opening for that day

fails if the dow wasn't open, or hasn't opened yet for that day, or the server's down.

Note - while this server is open, the owner notes:

No technical restrictions, users are expected to use common sense, when in doubt, ask.