sql(?): counting between twin datetime values


what best proceed count between twin datetime values fetched mysql i need count wholly between hours 08:00:00-16:00:00.



for instance i have values 2008-10-13 18:00:00 2008-10-14 10:00:00 inadequacy should 02:00:00.



can i sql best proceed it? i'm building website controlling php.



thank your answers.



edit: accurate thing i'm perplexing count "ticket" specific state during operative hours. integrate weeks.



edit2: i have problems counting tangible difference, nonetheless substracting off-time, 00:00:00-08:00:00 16:00:00-00:00:00 per day.



-samuli



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