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SQL TIme calculation

rlking12 asked
Last Modified: 2012-05-12
The calculation works great until you span 2 days.

Such as Oct 28 12pm to 1:30am Oct 29.

Should be 13.5 hours, my statement is returning 14.3

Any help would be greatly appreciated.

 Select Tech_ServiceID,txtTech,txtStartTime,
                convert(real,(24 + DateDiff(ss,txtStartTime,txtEndTime) / 3600)%24) +
                convert(real,((60 + (sum(DateDiff(ss,txtStartTime,txtEndTime)) % 3600) / 60) % 60) * .01) as Total_Time,
                Tech_Service_PayCodes.PayCodeDescription as txtPayCode
                from Tech_Service_Time
                LEFT OUTER JOIN Tech_Service_PayCodes ON Tech_Service_Time.txtPayCode = Tech_Service_PayCodes.PayCodeID
                        where timedate = '10-28-11'                
                group by txtTech,Tech_ServiceID,txtStartTime,
                order by TimeDate,txtStartTime

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