I had some of those Currency Revaluation (Rounding Gain/Loss) transactions generate when paying a bill. Only for a couple pennies, no big deal. I realized though that the date was wrong on the payment, so I fixed it. However, the date on the Currency Reval didn't update to match the corrected date. Any way to fix this? It's not a big deal and ultimately has no impact, but it's making my eye twitch.

Did you rerun the close process

No these are the ones that generate when you save the transaction, not part of the month-end close process