Ok, first post and pretty much a new user to Excel.  I have two sheets
that I am working with, trying to recall data from one to the other
that meets criteria.  In a nutshell:

Sheet 1 contains a column of unique values (col A), cols C,D, and E are
where I want to insert the formula to find data on Sheet 2.

Sheet 2 contains 4 columns, A contains multiple occurrences of each
value (from Sheet1, column A), each with its own timestamp in column
D.

On Sheet1, in column C, I want to find a value on Sheet2 in column A
and return the timestamp in column D.  I know I can use VLOOKUP for
this.

=VLOOKUP(B2,'Sheet2'!,A:A,4)

WHat I need to do is:

For Sheet1, column C:
Find the value (on Sheet2) with a timestamp in between minute 00 and
minute 19

For Sheet1, column D:
Find the value on Sheet2 with a timestamp between minute 20 and minute
39

For Sheet1, column E:
Find the value on Sheet2 with a timestamp between minute 40 and minute
59

Ok, it may not even make sense, but as I said, learning Excel here so a
lot of this is completely foreign to me.