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Jon Jon is offline
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Default [NEWBIE] date/time diff

I would like to create the following formulae:

A1: Start date/time e.g. Thursday 25/06/2009 08:00
B1: End date/time e.g. Thursday 25/06/2009 18:00
C1: Duration of break e.g. 01:00 (1 hour)
D1: B1 - A1 - C1 in hours

Any ideas?