Need Help to calculate difference between times

Hello everyone,
I have two fields which just stores the time in 24 hour format ex: 08:00 and 20:00 now I want to calculate difference between the two times
Kindle help me
Thanks for your help
Thanks
Ravi

Are your fields of varchar2 datatype or...?
Is 08:00 the start time or 20:00?
Date arithmetic is pretty simple in Oracle if you use the right datatype.
See:
http://asktom.oracle.com/pls/asktom/ASKTOM.download_file?p_file=6551242712657900129
Assuming you are storing strings:
SQL> -- generating sample data:
SQL> with t as (
2 select '08:00' btime, '20:00' etime from dual
3 )
4 --
5 -- actual query:
6 --
7 select numtodsinterval(to_date(etime, 'hh24:mi') - to_date(btime, 'hh24:mi'), 'day') nti
8 ,      (to_date(etime, 'hh24:mi') - to_date(btime, 'hh24:mi'))*24 dt
9 from   t;
NTI                                                                                 DT
+000000000 12:00:00.000000000                                                       12
1 row selected.
SQL>

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Need Help to calculate difference between times

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