Hello all,

I have two groups of data that consist of date (MM/DD/YYYY), time
(HH:MM:SS), and serial number. The first group is represents the date
and time that the serial number started production and the second group
represents when the serial number exited production. This data is
constantly recording, so it is a certainty that some data will enter
production on one date and finish on another. I need to come up with a
macro that will compare the two tables and show all of the serial
numbers that are common between the two tables and the elapsed time
between start of production and end of production. Any serial numbers
that aren't common should be ignored.

I have been playing around with vlookups, and I can get the elapsed
time, as long as both entries are on the same date. I can't figure out
how to get the date part to work, and I am sure that someone here will
have a better way of accomplishing this task.

Thanks in advance!
Tim