class range two hours

[#1]

hi i need to class two hours !!

for example

range	operator	hour login	hour logout
09:00-10:00	alex	08:30	10:50
	simon	09:00	09:30

usually i used clas with only one value !!!

how can i do ?

[sunny_talwar]

I don't really understand what you are trying to do here.

[#3]

thanks for reply, i try to explain better

my table have multiple timestamp login of operators

operator	login	logout
alex	09:30	10:50
simon	10:20	13:10

I need to count the minutes to login for each operator divided by hour (variable, can be 60 minutes, 30 minutes, etc)

operator	range	minutes logged
alex	09:00 to 10:00	30
	10:00 to 11:00	50
simon	10:00 to 11:00	40
	11:00 to 12:00	60
	12:00 to 13:00	60
	13:00 to 14:00	10

usually for range a field i use "class", but my problem here i have two fields: login and logout..