SYS_EXTRACT_UTC, sysdate and cast off in timestamp

I have a question for sys_extract_utc.

According to this document:
http://docs.Oracle.com/CD/B19306_01/server.102/b14200/functions167.htm

Function entry SYS_EXTRACT_UTC is a datetime_with_timezone.

then run this in my system:

(1) select TO_CHAR (SYSDATE, 'YYYY-MM-DD HH24') as the double mysysdate;
MYSYSDATE
----------------
2013-05-14 20:27


(2) select TO_CHAR (systimestamp, 'YYYY-MM-DD HH24 TZR') as the double mysystimestamp;
MYSYSTIMESTAMP
-------------------------------------------------
2013-05-14 20:27 + 03:00


(3) select TO_CHAR ((cast (sysdate as timestamp)), 'YYYY-MM-DD HH24 TZR') as the double cast_sysdate_timestamp;
CAST_SYSDATE_TIMESTAMP
-------------------------------------------------
2013-05-14 20:17 + 00:00


(4) select TO_CHAR (sys_extract_utc (cast (sysdate as timestamp)), 'YYYY-MM-DD HH24 TZR') as the double utc_time;
UTC_TIME
-------------------------------------------------
2013-05-14 17:27 + 00:00


Issues related to the:
How is it possible to have the query 4) correct... If the cast of sysdate timestamp in 3) not the timezone has you can see in the query 3)!

Whence the sys_extract_utc collects the information, in order to make query 4) correct?

Published by: PauloSMO on May 14, 2013 10:37

Hello

PauloSMO wrote:
... Whence the sys_extract_utc collects the information, in order to make query 4) correct?

Environment variables. See the Manual of globalisation
If you don't ever set these variables, they were probably taken from the operating system when the database was created.

Tags: Database

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