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Subtracting a whole number from working hours

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    Subtracting a whole number from working hours

    This is doing my head in, I'm sure its a dead simple solution but cannot get it to work..

    Cell A1 contains a start time formatted as [hh]:mm
    Cell B1 contains an end time formatted as [hh]:mm
    Cell D1 contains lunch perriod formatted as number with two decimal places
    Cell F1 contains total numbers hours worked formatted as [hh]:mm

    Subtracting the end and start times I've for but problem is when I try and subtract the 1 for lunch.
    (I've attached very simple excel sheet for ease)
    Attached Files Attached Files

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    Re: Subtracting a whole number from working hours

    1 is a whole day.

    In D2, put 0.04 (which is 1/24) and format the cell as time.
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    Re: Subtracting a whole number from working hours

    SUM((B2-A2)-D2/24)


    but better formatting the lunch as a time as Ali says

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