Comments on: Converting Time Zones in Oracle

By: Sunil B

Sunil B — Mon, 22 Nov 2010 09:41:35 +0000

Hi All,

I am a newbie in this domain. And would like to know how I can convert GMT into other TimeZones?

I have a timestamp in GMT and want to convert it to EST and MST, how I can use oracle to convert this?

Will Appreciate your response.

Thanks,
Sunil

By: Jithin

Jithin — Thu, 04 Mar 2010 08:07:50 +0000

Thanks for the information.But I have a query.

How we can convert GMT to GMT+4.

By: Parag

Parag — Mon, 23 Nov 2009 07:00:55 +0000

Found answer to my question/issue quickly (wanted to see some columns in different timezones). Thanks

By: rowman

rowman — Wed, 10 Jun 2009 13:50:35 +0000

we have used this two function:

(each schema has its own time_zone stored in sys_values table)

create or replace
function LOC_DATETIME(pDATE in date) return date is
vTimeZone varchar2(50);
vDbZone varchar2(50);
begin
select TIME_ZONE into vTimeZone from sys_values;
vDbZone := ‘Europe/BRUSSELS’;
return
to_date(to_char(from_tz(TO_TIMESTAMP(to_char(pDATE,’mm-dd-yyyy hh24:mi:ss’),
‘mm-dd-yyyy hh24:mi:ss’),vDbZone) at time zone vTimeZone,’mm-dd-yyyy hh24:mi:ss’), ‘mm-dd-yyyy hh24:mi:ss’);
end;
/
create or replace
function DB_DATETIME(pDATE in date) return date is
vTimeZone varchar2(50);
vDbZone varchar2(50);
begin
select TIME_ZONE into vTimeZone from sys_values;
vDbZone := ‘Europe/BRUSSELS’;
return
to_date(to_char(from_tz(TO_TIMESTAMP(to_char(pDATE,’mm-dd-yyyy hh24:mi:ss’),
‘mm-dd-yyyy hh24:mi:ss’),vTimeZone) at time zone vDbZone,’mm-dd-yyyy hh24:mi:ss’), ‘mm-dd-yyyy hh24:mi:ss’);
end;
/

it works

By: Patrick McShea

Patrick McShea — Fri, 07 Mar 2008 17:38:40 +0000

I’ve got a problem with java that extends to dbtimezone. If the dbtimezone defaults to a given timezone (ostensibly when created if not explicitly stated it’s SUPPOSED to get the OS timezone and I can’t see that ANYWHERE in the registry of my windows machine where it’s set to GMT -7:00 (we’re in GMT -6:00)) when it’s created, and its default in this case is off by an hour compared to the server it’s on, the java I’m calling converts the milliseconds of a given date according to the offset between the dbtimezone and the server setting)… When I change the dbtimezone to match the server and restart the instance it STILL acts as if it’s in the old time zone.

By: Suhail Khaki

Suhail Khaki — Tue, 30 Jan 2007 12:33:26 +0000

very useful and well presented information. Thank you

By: Prasad Narmeta

Prasad Narmeta — Wed, 03 Jan 2007 05:17:50 +0000

Vasant,
There is another way you can check..
You need to alter your session.. Here is an example to convert from CET to EST..

alter session set nls_date_format = ‘DD.MM.YYYY HH24:MI:SS’;
alter session set NLS_TIMESTAMP_FORMAT = ‘DD.MM.YYYY HH24:MI:SSXFF’;
alter session set time_zone = ‘US/Eastern’;

select id,time1, to_date(to_char((from_tz(to_timestamp(time1, ‘dd-mm-yyyy hh24:mi:ss’) ,’Europe/BRUSSELS’)
at time zone ‘US/Eastern’),’mm-dd-yyyy hh24:mi:ss’),’mm-dd-yyyy hh24:mi:ss’) from Table1

This will also takes care of Daylight Savings.

Hope this helps.

Prasad.

By: Jon

Jon — Wed, 30 Aug 2006 00:35:55 +0000

Jeff,

You should check the docs for your version of Oracle. I believe this varies, but my guess is your dates will continue to be displayed in their originally inserted GMT.

By: Jeff

Jeff — Mon, 28 Aug 2006 16:37:34 +0000

I have a database that stores date values in GMT, and currently the DBTIMEZONE is set to GMT as well, if I change the DBTIMEZONE, will dates be displayed in the GMT (stored) format, or will they be displayed in the DBTIMEZONE offset from GMT?

Thansk!
Jeff

By: Sergio

Sergio — Tue, 27 Jun 2006 18:06:41 +0000

Useful article, thanks. Note that a database restart is required in order for the alter database set TIME_ZONE= to take effect.

Sergio