Also note:

Not reliable if the time span is greater than 24 hrs.

Biff

"Biff" wrote in message
...
Hi!

Slightly shorter....

A1 = Date/Time in
B1 = Date/Time out

=IF(B1="","",IF(MOD(A1,1)<MOD(B1,1),MIN(MIN(MOD(B1 ,1),6/24)-MOD(A1,1),6/24),IF(MOD(A1,1)<22/24,2/24+MIN(MOD(B1,1),6/24),1-MOD(A1,1)+MIN(MOD(B1,1),6/24)))*24)

Note: Discovered rounding discrepancies during testing but they do not
effect the correctness of the results. For example:

A1 = 8/7/2005 10:00 PM

=MOD(A1,1) = 0.91666666666424100000

The time value: 10:00 PM is equivalent to 22/24 as used in the formula.
However:

22/24 = 0.91666666666666700000

Biff

"HappyTrucker"
wrote in message
...

OK, I think I've sorted it. Well it seems to work anyway. I don't know
whether I stumped you all, or it just wasn't clear enough. Or maybe the
problem wasn't interesting enough. Anyway, if anyone's interested,
here's what I came up with eventually. And my God is it a loooong one:

=IF(B15="","",IF(AND((B14<(LEFT(B14,5)+"22:00")),( B15<=(LEFT(B15,5)+"06:00"))),((B15-(LEFT(B14,5)+"22:00"))*24),IF(AND((B14=(LEFT(B14, 5)+"22:00")),
(B15<=(LEFT(B15,5)+"06:00"))),(B15-B14)*24,IF(AND((B14(LEFT(B14,5)+"22:00")),(B15=( LEFT(B15,5)+"06:00"))),(((LEFT(B15,5)+"06:00")-B14)*24),8))))




--
HappyTrucker
------------------------------------------------------------------------
HappyTrucker's Profile:
http://www.excelforum.com/member.php...o&userid=25997
View this thread:
http://www.excelforum.com/showthread...hreadid=393601