Matching two spreadsheets by time of day

Ok, I have two sets of data that I need to match up to one another.

The first set of data (STI) has to be transferred back into Access when all is said and done, and cannot be modified outside of these two columns:
Column 2: Time of day in number of seconds past the year 1900
Column 13: Recieved Signal 2

The data (Box) that I'm importing can be cut an paste anywhere on the sheet and will come in in this format:
Col 1: Time of day in number of days past the year 1900
Col 2: Time of day in HH:MM:SS 'not used
Col 3: Voltage recieved
Col 4: Signal Strength

So what I need to do is match up Col 4 from the box to column 13 of STI by using the time from each set of data. I think what I need is a loop in a loop, but so far Excel isn't liking it like that.

I will eventually have to add some rounding into the time because they are off by decimal points, but for now we can assume it is a perfect match.

This is what I was thinking so far. Could I get an expert on loops let me know if I'm way off base. Also, is there a way to show (such as by highlighting) the data that was unable to be matched?

Sub matchup()
datalength = Cells(Rows.Count, 1).End(xlUp).Row 'STI data from access
impdatalength = Cells(Rows.Count, 16).End(xlUp).Row 'TX data from box
For i = 2 To datalength
Cells(i, 14).Value = Cells(i, 2).Value / 86400 'convert time from seconds to days
If Cells(i, 13).Value = "-130" Then Cells(i, 13).Value = "" 'remove default Rec2 values
Next
For o = 1 To impdatalength
For p = 2 To datalength
If Cells(o, 16).Value = Cells(p, 14) Then
Cells(o, 19).Cut Cells(p, 13)
Next
Next
End Sub

Thanks guys,
Wilro85

I figured out how to do this using vlookup. This thread can be closed/deleted.