Just my experience:
Two summers ago I spent some time in the UK, France, Spain, and Switzerland.  
Most of my purchases
were financed through either my credit card or my ATM card.  According to the 
Chase rep I spoke to, 
the exchange rate that I was charged was the closing rate of the day prior to 
the transaction.  I
don't remember which side she said,  but she did say the rate was the same for 
credits and debits
(on the same day, of course)
Mike
Ulix Goettsch wrote:
> 
> On Wed, 30 Sep 1998, Daniel Thompson wrote:
> 
> > My experience has been that credit card companies give poor rates on
> > foreign exchange. For a larger purchase, you might want to shop around for
> > the best deal.
> 
> In general this is not true.  You usually get better rates when charging
> on your card than exchanging cash in a bank.
> 
>     Ulix                                                    __/__,__
> .......................................................... (_o____o_)....
>                                                            '67 Sprite
 
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