Working with time format in Numbers

I am trying to subtract sunset time from sunrise time to determine length of daylight. When I imported data from an excel spreadsheet, the column I had the difference did not transfer correctly. I have tried unsuccessfully to subtract a sunset time, say for example 18:03 from a sunrise time, 6:18. Is there anyway to do that in Numbers?

As you are asking in the iWork '08 forum, I respond for Numbers '08.
(a) all these kinds of things are explained in "What you wanted to know about time values"
http://discussions.apple.com/thread.jspa?messageID=7958365
(b) assuming that
B2 contains 18:03
C2 contains 06:18
in D2 type the simple formula: =TIME(0,0,(B-C)24*6060)
with Numbers '09 it would be even more simple: =B-C
Yvan KOENIG (from FRANCE mercredi 11 février 2009 20:29:16)

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