Forex Conversions

[Ken]

Hi. What is the coded logic behind the forex calculations in the Accounts
page.

The reason I ask is that some of my stock holdings (priced in CAD) are not
being converted to my reporting currency (XAU).  How much data does GnuCash
need in the price editor to make this conversion?

For instance, I have two prices for the stock in CAD. I also have prices for
XAU/USD and one price for USD/CAD.  Will GnuCash use the appropriate
currency pair inverses to convert the stock price in CAD, to USD, to XAU?
Does it need these prices all on the same day or can it interpolate between
dates?  Where might I be able to find information on the logic used to make
these conversions so I can figure out why it can not calculate the value of
my stock holidings in the desired reporting currency?

Many thanks,
Ken