Timesheet: Calculate Time within a period when crossing midnight

Hi All,

I am creating a timesheet using excel 2003 users enter their shift start/finish time and a break start/finish time. Emplyee's can work night shifts (ie across midnight).

There are penalty rates which apply at different times. I need to be able to work out the amount of worked time that fits into a certain time period. eg. 10pm-7.30am, 7.30am-10pm.

I have a solution based on A clever formula from Daniel Maher that will calculate time within a period. But it doesn't work when the shift goes over two days.

I have attached a spreadsheet to help show the problem.
Any help would be greatly appreciated? I look forward to seeing your possible solutions!