I imported information about the daily currency exchange rate from an external site to Excel.
I use the exchange rate in some formulas every day. The problem is, when the next day comes, exchange rate changes, all the formulas are altered, and I would like them to be altered only for formulas in a row pertaining to the current date. For yesterday, I'd like to keep yesterday's exchange rate.
Is there a way to stop a formula from updating if a condition is satisfied? The condition in this case would be if date to which the formula pertains is less than TODAY().