I have a transaction (buy and sell) that comes in like this:

TimeDiff Side Stock Price Size Time1 Firm
0:00:00 Sell OMC 6.2 10 10:57:52 AM 919
0:01:59 Buy OMC 6.2 10 10:57:52 AM 980


I am trying to find a formula that can be added to each side of the
transaction that will display the counterside's "TimeDiff".

I thought it might be possible using index and matching ?

Thank you in advance.

Carl