Time date math and daylight

I try to get the number of seconds between 1 March 2010 and 31 March 2010 in Oracle. I'm in the Eastern time in the United States. Everything I try just comes back with 30 days * 86400 seconds per day = 2592000. 1 hour was lost when we moved to summer time, so the correct answer is 2588400.

How to create a function in Oracle (10 g 2) which will give me the number of seconds between 2 dates, or stamps that is aware of the loss of an hour in March and gain an hour in November?

As was already suggested by Oracle automatically takes day light saving time into account.
For example:

with d as
(
select TIMESTAMP '2010-03-31 00:00:00 US/Pacific'  edt,
TIMESTAMP '2010-03-01 00:00:00 US/Pacific' sdt,
TIMESTAMP '2010-03-31 00:00:00'  edt1,
TIMESTAMP '2010-03-01 00:00:00' sdt1
from dual
)
select (edt - sdt) * 24 * 3600,(edt1 - sdt1) * 24 * 3600
from d
;
(EDT-SDT)*24*3600             (EDT1-SDT1)*24*3600
+2588400 00:00:00.000000     +2592000 00:00:00.000000

TRN
Sudhakar B.

Edited by: Sudhakar_B may 25, 2010 15:06

Tags: Database

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