Time zone conversion in SQL query

In Oracle, you can achieve this with below query:

Select current_timestamp, current_timestamp at time zone 'Australia/Sydney' from dual;

Where Australia/Sydney is the name of your timezone in which you want to convert your time.

You can use this query, without having to worry about timezone changes.

select to_char(cast(application_recv_date as timestamp) at time zone 'US/Eastern',
               'MON dd, YYYY'
              )
from application;

Ex:

EDT:

select cast(date'2014-04-08' as timestamp) d1,
       cast(date'2014-04-08' as timestamp) at time zone 'US/Eastern' d2
from dual;

D1                                 D2
---------------------------------- -------------------------------------------
08-APR-14 12.00.00.000000 AM       07-APR-14 08.00.00.000000 PM US/EASTERN

EST:

select cast(date'2014-12-08' as timestamp) d1,
       cast(date'2014-12-08' as timestamp) at time zone 'US/Eastern' d2
from dual;

D1                                 D2
---------------------------------- -------------------------------------------
08-DEC-14 12.00.00.000000 AM       07-DEC-14 07.00.00.000000 PM US/EASTERN

UPDATE:

Thanks to Alex Poole for reminding that, when timezone is not specified, local timezone is used for conversion.

To force the date to be recognized as GMT, use from_tz.

from_tz(cast(date'2014-12-08' as timestamp), 'GMT') at time zone 'US/Eastern'