convert sysdate into GMT

How do we convert the sysdate to GMT format.
select dbtimezone does give us the GMT offset and not the literal 'time zone'
This makes using 'to_char(new_time(entry_date, 'EST', 'CST')' kind of approach impossible - as it does not accept offsets.

How then do we get the 'TZ' of the database - alternatively how do we convert the sysdate into GMT.
ranadhirAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

sdstuberCommented:
I recommend NOT using dbtimezone.

Oracle recommends it only ever be set to +0:00
if you want times with timezones

use systimestamp instead of sysdate


0
sdstuberCommented:
try this....

SELECT
       SYSTIMESTAMP,
       SYSDATE local_sysdate,
       SYSDATE - EXTRACT(TIMEZONE_HOUR FROM SYSTIMESTAMP) / 24 gmt_sysdate
FROM   DUAL
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ranadhirAuthor Commented:
this works great - thanks
 just one question since you advised against dbtimezone.

Given a time zone region is it fine to V$TIMEZONE_NAMES in my PL/SQL to get teh corresponding TZ abbrev.
Also,given a off-set is there a way to get the corresponding TZ?
0
sdstuberCommented:
There is no reliable way to go from an offset to an abbreviation using ONLY the offset as your input information
because an offset can have multiple meanings from observation of Daylight Saving Time and/or regional abbreviations.

EST and CDT have the same offset (-5)   (Easter Standard vs Centeral Daylight)  - daylight observation
EDT and ECT have the same offset (-4)  (Eastern Daylight vs Eastern Caribbean) - daylight observation and region

You can build your own lookup table of abbreviations and offsets that map 1-to-1.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Oracle Database

From novice to tech pro — start learning today.