Time zone conversion to CST based GMT offset

问题

I have date(01-oct-2014), time (00:37:31), GMT difference(-360) now I want to get the time conveted to CST. The solution can be in javascript Or oracle databse.

I have read several articles but could'nt get any where..can some one help me out on this...

回答1:

In Oracle, to convert your local time to time of another timezone, you need to CAST TIMESTAMP WITH TIMEZONE.

For example, I want to convert 'IST' Indian standard time, i.e. my local timezone to 'CST', i.e. Central :

SQL> WITH T AS
  2    ( SELECT to_timestamp('10/01/2014 11','mm/dd/yyyy hh24') ist FROM dual
  3    )
  4  SELECT ist,
  5    CAST(CAST(ist AS TIMESTAMP WITH TIME ZONE) at TIME zone 'CST' AS TIMESTAMP) cst
  6  FROM t
  7  /

IST                                 CST
----------------------------------- ------------------------------
01-OCT-14 11.00.00.000000000 AM     01-OCT-14 12.30.00.000000 AM

Take care of Daylight saving. You might have to take care in understanding CST and CDT.

回答2:

There are several ways to do this:

SELECT 
    (TIMESTAMP '2014-10-01 00:37:31') AT TIME ZONE 'CST',
    FROM_TZ((TIMESTAMP '2014-10-01 00:37:31'), 'CST'),
    CAST((TIMESTAMP '2014-10-01 00:37:31') AT TIME ZONE 'CST' AS TIMESTAMP) 
FROM DUAL;

It depends if the result shall include the new time zone or not.

来源：https://stackoverflow.com/questions/26134951/time-zone-conversion-to-cst-based-gmt-offset