Convert EST GMT

Hello


How can I convert the time zone IS in the zone GMT and want to have the day light economy adjusted automatically.
Is new_time will take care of day light, save the changes?

I tried from_tz, but does not receive time GMT.


SELECT FROM_TZ (CAST (TO_DATE(sysdate, 'dd/mm/yyyy HH24:MI:SS') AS TIMESTAMP), "U.S. / Eastern'") to the TIMEZONE "GMT" From_TZGmtTime,.
TO_CHAR (new_time (sysdate, 'IS', 'GMT'), 'hh24:mi:ss of mon-dd-yyyy') New_TimeGmtTime,
To_char(sysdate,'dd-mon-YYYY HH24:mi:ss') EST_LocalTime
FROM DUAL;

FROM_TZGMTTIME
_______________________________
04.56.00.000000000 JULY 6, 11 AM GMT


NEW_TIMEGMTTIME
___________________
July 6, 2011 17:23:55


EST_LOCALTIME
_______________________
July 6, 2011 12:23:55


From_Tz both New_Time does not give me time GMt, the hour GMT, when I run this query is 16:23

Thank you

Ben

Look at your request:

To_date (sysdate, ' dd/mm/yyyy HH24:MI:SS)

Does this make any sense? Not really. To_date first parameter is a string. You pass a date. As a result, SYSDATE is implicitly converted to a string using format default date that most likely does not include the part default time, then on 00:00:00. See the difference:

SQL> SELECT FROM_TZ(CAST(TO_DATE(sysdate, 'dd/mm/yyyy HH24:MI:SS') AS TIMESTAMP), 'US/Eastern') AT TIME ZONE 'GMT' From_TZGmtTime ,
  2  to_char(new_time(sysdate,'EST','GMT'),'dd-mon-yyyy hh24:mi:ss') New_TimeGmtTime,
  3  To_char(sysdate,'dd-mon-yyyy hh24:mi:ss') EST_LocalTime
  4  FROM DUAL ;

FROM_TZGMTTIME                                                              NEW_TIMEGMTTIME      EST_LOCALTIME
--------------------------------------------------------------------------- -------------------- --------------------
06-JUL-11 04.56.00.000000 AM GMT                                            06-jul-2011 18:16:49 06-jul-2011 13:16:49

SQL> SELECT FROM_TZ(CAST(TO_DATE(TO_CHAR(sysdate, 'dd/mm/yyyy HH24:MI:SS'), 'dd/mm/yyyy HH24:MI:SS') AS TIMESTAMP), 'US/Eastern') AT TIME ZONE 'GMT' From_TZGmtTime ,
  2  to_char(new_time(sysdate,'EST','GMT'),'dd-mon-yyyy hh24:mi:ss') New_TimeGmtTime,
  3  To_char(sysdate,'dd-mon-yyyy hh24:mi:ss') EST_LocalTime
  4  FROM DUAL ;

FROM_TZGMTTIME                                                              NEW_TIMEGMTTIME      EST_LOCALTIME
--------------------------------------------------------------------------- -------------------- --------------------
06-JUL-11 05.17.26.000000 PM GMT                                            06-jul-2011 18:17:26 06-jul-2011 13:17:26

SQL> 

Now new_time does not DST unless you say it explicitly:

SQL> SELECT to_char(new_time(trunc(sysdate),'EST','GMT'),'dd-mon-yyyy hh24:mi:ss') New_TimeGmtTime,
  2         to_char(new_time(trunc(sysdate),'EDT','GMT'),'dd-mon-yyyy hh24:mi:ss') New_TimeGmtTime_DST,
  3         to_char(trunc(sysdate),'dd-mon-yyyy hh24:mi:ss') EST_LocalTime
  4   FROM DUAL
  5  /

NEW_TIMEGMTTIME      NEW_TIMEGMTTIME_DST  EST_LOCALTIME
-------------------- -------------------- --------------------
06-jul-2011 05:00:00 06-jul-2011 04:00:00 06-jul-2011 00:00:00

SQL> 

SY.

Tags: Database

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