Hello,

I am wondering, why following two values result in a shift by 3.5 hours. I 
would expect them to be identical.

I understand that canonical time zone names could be ambiguous at times but I 
think IST is not one of them.

Any explanation?

---------------
test=# select '2012-08-07 05:24:56.758891+05:30'::timestamptz;
           timestamptz            
----------------------------------
 2012-08-07 05:24:56.758891+05:30
(1 row)

test=# select '2012-08-07 05:24:56.758891 IST'::timestamptz;
           timestamptz            
----------------------------------
 2012-08-07 08:54:56.758891+05:30
(1 row)

shridhar@bheem ~$ psql test
psql (9.1.4)
Type "help" for help.

test=# select version();
                                                 version                        
                         
---------------------------------------------------------------------------------------------------------
 PostgreSQL 9.1.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.7.0 
20120505 (prerelease), 64-bit
(1 row)
---------------

TIA.
-- 
Regards
 Shridhar

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