Resolution Time out of range

[#1]

Good morning.

I'm trying to calculate the time spent for solving activities.

The range time is 10 AM - 6 PM.

I saw that on another topic there was a similar problem so I used the following code:

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((NetWorkDays(CREATEDDATETIME,ProcessCompleted) //FULL Working days between two dates

    -IF(Frac(ProcessCompleted)<Time#('18:00','hh:mm'),1,0)  //if close day isn't complete subtract 1 from Network days

    -IF(Frac(CREATEDDATETIME)>Time#('10:00','hh:mm'),1,0)   //if start day isn't complete subtract 1 from Network days

    ) * 8

+RangeMax(((Time#('18:00','hh:mm') - Frac(CREATEDDATETIME))*24),0)

+RangeMax(((Frac(ProcessCompleted) - Time#('09:00','hh:mm'))*24),0)) - (NetWorkDays(CREATEDDATETIME,ProcessCompleted))

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After I turned the result(OreEffettive) in hours and minutes with the following code:

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=SubField(OreEffettive,',',1)&','&subfield(left(subfield(OreEffettive,',',2),2)*60/100,',',1)

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The results are correct when the date of creation or termination are between 10 AM and 6 PM, but there are errors when the creation date (or resolution) is outside this range.

example:

CREATEDDATETIME = 30/11/2012 10.44

ProcessCompleted = 30/11/2012 10:59

Resolution = 0.15 h

CREATEDDATETIME = 13/02/2013 18.11

ProcessCompleted = 13/02/2013 18.15

Resolution = 8.15 h

Can someone help me?

Best Regards.

Antonio