Working hours - identify and split in different rewards shifts

Trial.xlsHello,

I'm currently working with MS Excel 2010 and have a document full of people with their working hours. So their start time and their end time.
Now these people should get a monetary reward dependent on the different time shifts they work in. For example, someone is scheduled for a shift starting at 6:00 AM (cell A1) until 20:00 PM (Cell B1). His actual clocking-in time is 5:48 AM (Cell C1) and clocking-out time is 19:58 PM (Cell D1). There are three shift reward types:

1) Shift Regular (E1): From 7:00 AM until 18:00 PM
2) Shift night (F1): From 18:00 PM until 0:00 AM
3) Shift midnight (G1): From 0:00 AM until 7:00 AM

How can create a formula in cell E1, F1 and G1, which will first look at the actual clocking-in time and scheduled time and will say 5:48 AM is too early as you start at 6:00 AM, so 1 hour in cell G1, and 11 hours in cell E1 and 2 hours in F1 (should automatically round up 19:58 to 20:00). However, after 4 hours work someone will get 0:30 hours lunch break, which should be deducted in E1 as well. And as mentioned earlier actual clocking time should be round up to 15 minutes, so 19:53 should be 20:00 and 6:13 should be 6:15.

Also note that the cells with time are in TIME and should become numbers (e.g. 7,5 hours) in cells E1, F1 and G1.

Hope someone can help me with this complex task. I also added an attachment, which shows what I would like to retrieve automated in the RED boxes.