[PLUG] Software for tracking/calculating/presenting time periods (off-topic)

[Greg Helledy <gregsonh@gra-inc.com>]

We have a project which involves studying fatigue in airline pilots. 
Unfortunately, many pilots are unable to achieve 8-hour sleep periods, 
napping when and where possible.  As a result, they experience multiple 
sleep/wake cycles per day...sometimes several.  With an aircraft having 
two or three flight crew, and looking back 72 hours before an accident, 
it can become complex to work with, understand and present to others the 
time periods involved.

Is there any specialized software for working with time periods?  What 
would it be called?  If anyone has experience with this, please let me 
know (off-list is probably best).
Thanks,
Greg

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