class interval from two hour

[#1]

hi, sorry for my bad english, i have a big big problem !!

i have

operator	login	logout
Alex	09:50	11:30
Simon	09:00	10:30
Luca	11:01	12:00

i need to make a class hour for count minutes logged

range hour	operator	minutes logged
09:00 to 10:00	Alex	10
	Simon	60
10:00 to 11:00	Simon	30
11:00 to 12:00	Luca	59

usually for class 1 time i use

=dual(timestamp(class(frac(mytime)	,vTimeRange/(24*60)),'hh:mm') & ' - ' &
	timestamp(class(frac(mytime)+vTimeRange/(24*60),vTimeRange/(24*60)),'hh:mm')
	,	class(frac(mytime)	,vTimeRange/(24*60)))

but with range 2 times i dont know !!???

how can i do ?

there are some exaples with class two datetimes ?

thanks

[Gysbert_Wassenaar]

I'd calculate this in the script with something like this:

Data:
LOAD *, If(Hour<login, Interval(Hour+1/24-login,'m'),if(Hour+1/24< logout,1/24,logout-Hour)) as [Minutes logged];
LOAD *, Time(Floor(login + (IterNo()-1)/24, 1/24),'hh:mm') as Hour
While Floor(login + (IterNo()-1)/24,1/24) < logout;
LOAD 
  operator, 
  Time#(login,'hh:mm') as login,
  Time#(logout,'hh:mm') as logout
INLINE [
operator, login, logout
Alex, 09:50, 11:30
Simon, 09:00, 10:30
Luca, 11:01, 12:00
];

The inline load is just an example. You can replace that with a load statement that load the data from your real source table.