What is the difference between an "intraday" and "overnight position"?

Intraday positions are all positions opened anytime during the 24 hour period AFTER the close of FXA’s normal trading hours at 4:30pm EST. Overnight positions are positions that are still on at the end of normal trading hours (4:30pm EST), which are automatically rolled by FXA at competitive rates (based on the currencies interest rate differentials) to the next day’s price.