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Excel/TTR Formula to Determine if SLA Met

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Question
Hello - thanks for taking my question.  I am using the following formula where C5= Start Time & Date and D5=End Time & Date.  Business hours are M-F 8 AM to 4 PM.  The start and end time I am trying to calculate is 7/24/15 5:12 Pm and the End Time is 7/24/15 5:42 PM.  It is calculating at zero time when it should be 30 minutes.  Do you see anything I can correct in this formula?

=(NETWORKDAYS(C5,D5,HolidayList)-1)*("16:00"-"08:00")+IF(NETWORKDAYS(D5,D5,HolidayList),MEDIAN(MOD(D5,1),"16:00","08:00"),"16:00")-MEDIAN(NETWORKDAYS(C5,C5,HolidayList)*MOD(C5,1),"16:00","08:00")

Answer
Kathie

Sorry to be late in answering--I am answering for Richard who is not well at the present.  I  am not an excel expert, Richard suggests that you try reformatting the time cells.

Hope this works for you, but if it doesn't please reask the question of another all experts person.  
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Richard Roberts

Expertise

Can assist you in most areas of Excel, have been working with it for about 15 years in many types of applications, but primarily in financial and accounting applications. I am a CPA and many client or client problems have necessitated the use of excel. I am not an expert in charting, macros, or pivot tables.

Experience

Have been working with Excel for about 20 years primarily in accounting and financial areas.

Education/Credentials
BA, Certified Public Accountant

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