oracle daylight savings

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
pcombAsked:
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sdstuberCommented:
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
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pcombAuthor Commented:
perfect thanks
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sdstuberCommented:
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);
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