Solved

oracle daylight savings

Posted on 2014-10-22
3
400 Views
Last Modified: 2014-10-22
I am trying to conver the following epoch 1413902247 (2:37 pm on 10/21 in GMT therefre 10:37 am EST) to a date and time. My env is EST and I believe DST is in effect and we are -4 from GMT as of today (10/22/2014).
I have been tring various things below and can get the time. I cannot seem to get it converted to EST with daylight when I use EDT i get invalid timezone?


 SELECT CAST ((from_tz(CAST(to_Date('1970-01-01','YYYY-MM-DD') +1413902247/86400 AS TIMESTAMP),'EST') at TIME ZONE ('US/Eastern')) as DATE) --as EST
,from_tz(cast(to_Date('1970-01-01','YYYY-MM-DD') +1413902247/86400 AS TIMESTAMP),'US/Eastern') as EDT
       ,to_Date('1970-01-01','YYYY-MM-DD') +1413902247/86400 AS TIMESTAMP
--,                          to_char(new_time(to_date('1970-01-01','YYYY-MM-DD HH24:MI:SS') +1413902247/86400000) ,'EST','GMT'),'dd-mon-yyyy hh24:mi:ss') New_TimeGmtTime_DST
   FROM dual
0
Comment
Question by:pcomb
  • 2
3 Comments
 
LVL 73

Accepted Solution

by:
sdstuber earned 500 total points
ID: 40397449
SELECT (TIMESTAMP '1970-01-01 00:00:00 +00:00' + NUMTODSINTERVAL(1413902247, 'second'))
           AT TIME ZONE 'US/Eastern'
  FROM DUAL


US/Eastern is daylight savings aware, so it will return -04:00 in the DST period  and -05:00 in the Standard period
0
 

Author Comment

by:pcomb
ID: 40397459
perfect thanks
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 40397474
and, if you need to reverse it, then try one of these


SELECT   EXTRACT(DAY FROM i) * 86400
       + EXTRACT(HOUR FROM i) * 3600
       + EXTRACT(MINUTE FROM i) * 60
       + EXTRACT(SECOND FROM i)
  FROM (SELECT TIMESTAMP '2014-10-21 10:37:27 -04:00' - TIMESTAMP '1970-01-01 00:00:00 +00:00' i
          FROM DUAL);

SELECT   EXTRACT(DAY FROM i) * 86400
       + EXTRACT(HOUR FROM i) * 3600
       + EXTRACT(MINUTE FROM i) * 60
       + EXTRACT(SECOND FROM i)
  FROM (SELECT   FROM_TZ(TIMESTAMP '2014-10-21 10:37:27', 'US/Eastern')
               - TIMESTAMP '1970-01-01 00:00:00 +00:00'
                   i
          FROM DUAL);
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction A previously published article on Experts Exchange ("Joins in Oracle", http://www.experts-exchange.com/Database/Oracle/A_8249-Joins-in-Oracle.html) makes a statement about "Oracle proprietary" joins and mixes the join syntax with gen…
Configuring and using Oracle Database Gateway for ODBC Introduction First, a brief summary of what a Database Gateway is.  A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
This video shows syntax for various backup options while discussing how the different basic backup types work.  It explains how to take full backups, incremental level 0 backups, incremental level 1 backups in both differential and cumulative mode a…
This video shows how to Export data from an Oracle database using the Original Export Utility.  The corresponding Import utility, which works the same way is referenced, but not demonstrated.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now