Subtracting two time Stamps

Hello all,
thanks for looking
I am subtracting (systimestamp - "TIME_IN") as "HOURS_WORKED"
(08/30/2010 04:42PM - 08/30/2010 04:00AM) ="HOURS_WORKED"
the column is called hours worked, the 'hours worked'columns shows '+000000000 12:42:58.9881'
I understand that hours worked are 12 hours 42 mins and 58 seconds.
is there a way i can format this column to just show me hours and mins?
from '+000000000 12:42:58.9881' to 12:42?
is there an easier way?
Thanks in advance
Edited by: jo3y2 on Aug 30, 2010 5:19 PM

select to_char(sysdate,'hh24:mi:ss') from dual
or
SELECT TO_CHAR(date1,'MMDDYYYY:HH24:MI:SS') date1,
TO_CHAR(date2,'MMDDYYYY:HH24:MI:SS') date2,
trunc(86400*(date2-date1))- 60*(trunc((86400*(date2-date1))/60)) seconds,
trunc((86400*(date2-date1))/60)-60*(trunc(((86400*(date2-date1))/60)/60)) minutes,
trunc(((86400*(date2-date1))/60)/60)- 24*(trunc((((86400*(date2-date1))/60)/60)/24)) hours,
trunc((((86400*(date2-date1))/60)/60)/24) days,
trunc(((((86400*(date2-date1))/60)/60)/24)/7) weeks
FROM date_table
see this post
http://www.databasejournal.com/features/oracle/article.php/2234501/A-Comparison-of-Oracles-DATE-and-TIMESTAMP-Datatypes.htm

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it gives error.how to subtract two time stamps

Hi,
user10447332 wrote:
declare
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begin
select localtimestamp into a from dual;
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it gives error.how to subtract two time stampsA TIMESTAMP represents a point in time.
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<<KUDOS ARE WELCOME>>
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Attachments:
Time stamp format difference.jpg ‏102 KB

Ranjeet_Singh wrote:
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Subtracting two time Stamps

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