Fidelity processes such transactions on a large scale. It's safe to assume that the USD listed on the Fidelity statement would be the correct exchange rate for the date of the transactions.
If you choose you can always compare the rates using the Yearly Average Currency Exchange Rates on the IRS website as noted by @Irene2805.
The date to use for purchase (and for sale) for tax law is the trade date, not the settlement date.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
