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Hi Sam, thanks for posting here in the Microsoft community, you can use this formula in D1: =INDEX(B:B, MATCH(MAX(FILTER(A:A, A:A<=C1)), A:A, 0))
This finds the latest date in Column A that’s not greater than C1, then returns the corresponding value from Column B.
Make sure Column A contains valid Excel date values and is not text-formatted, or the formula may not work correctly.
I hope this helps you out, let me know
Chard