Split timestamp into different day part.

Hi guys,

I am little bit confused, don’t know how to transform this type of scenario
we have 2 column in data session start and session end time
if we considered 1st row of data, Start time is 5:40:21 and end time is 06:01:56.
 we are considering if user watched the TV from 1 AM to 6 AM it should go to 1st day part
if user watch TV after 6 AM to 9 AM it should go into 2nd day part and so on.

I want to check if user watch TV in 1st day part start time 5:40:21 the duration split into 2 rows
before 6 time (second) showing the record in 1st row.
Rest of the duration start with 6:01:56 means 116 second should show in next record.

there are few start time and end time start and end in a same day part.
I can handle this type of scenario but if user watched TV in 2 day part 1 and 2 or may by 1,2,3
how to split duration in different day part.