A closing value that stops moving
The question asked in March is about December, and the stock has moved since. Recomputing produces a number that is defensible to nobody: it is not what December was worth, it is what December would be worth if nothing had changed.
You record the value at the closing date and it is kept as recorded: a question about a date with nothing recorded gets a refusal rather than an approximation. The same screen then sets that value against the general ledger, line by line, turning a disagreement into a list of differences to work through.