I really hope some one can help me with this because my brain has given up.

I have constructed a work sheet which calculates the downtime of automatic
bollards in our city.

In my spread sheet you input the date and time that the bollard goes down and
then you input the date and time that the bollards starts functioning again.

At the moment my formula is this: =(D28-B28)+(D28<B28) D28 being time up and
B28 being time down. This works fine but the problem is that ive just been
told that sundays cannot be counted and on some sites the hours from 9.30am -
7.30am the next day cannot be counted as down time.

Is there a simple adaption to this formula that if I input the date and time
the system goes down and the date and time it comes up again, it will
calculate the amount of hours down but omit sundays or whatever hours I
specify.

Your help would be EXTREMELY appreciated.

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