How to get access to recognize a 10 hour day

[bcatsdk]

Hello
I'm creating a small scheduling database whereby Due Date is entered into the system. A calculation is made and returns the number of hours that it will take to do a task. The number of hours is deducted from the Due Date to give a start date for the task. My problem is the place of work only works a 10 hour day 8am - 6pm. Mon to Friday. So if I enter a Due Date for the task ie 2nd Feb 2014 @ 1pm in the afternoon and it is going to take 12 hours to complete it will deduct the number of hours from that time showing a start date 2nd Feb 2014 @ 1am. Is there a way to solve this.

Many Thanks in return.

PS I'm using Access 2010

[z{Moderator's Comment<Please do not double post your questions.
Doing so can accidentally result in the deletion of both threads.>}]

Hello
I'm developing a small scheduling Database for my work.
We work a 10 Hour Shift 8am - 6pm Monday to Friday. So far I have been able to enter a Due Date into the <snip>

[zmbd]

bcatsdk:
We normally do not provide completed code without seeing what you have already attempted.
Please provide your code, properly troubleshot and formated within the post using the [CODE/] button.

I can walk you thru the logic if you'd like and that will help you write the code.