Data corruption in PostgreSQL timestamp field

I have a PostgreSQL table with the following schema -

CREATE TABLE test (
  id serial NOT NULL PRIMARY KEY,
  username varchar(100) NOT NULL, -- The user name
  dob timestamp with time zone NOT NULL -- The date of birth
);

      

        
        
        
      

    

Then I inserted some data into a data table like this -

INSERT INTO "test" ("username", "dob") VALUES (E'Scotty', E'2009-05-14 15:44:43');

      

        
        
        
      

    

And if I check the DB for data, I get this -

mydb=> select username, dob from test where username='Scotty';
 username |            dob            
----------+---------------------------
 Scotty   | 2009-05-14 15:44:43+05:30
(1 row)

      

        
        
        
      

    

Everything is fine and dandy, until I try to insert some data with a date before 1946 -

INSERT INTO "test" ("username", "dob") VALUES (E'James T Kirk', E'1945-01-01 11:30:11');

mydb=> select username, dob from test where username='James T Kirk';
      username |            dob            
-------------- +---------------------------
 James T Kirk  | 1945-01-01 11:30:11+06:30
(1 row)

      

        
        
        
      

    

Take a look at the above result. Note that the Timezone value has changed from +05: 30 to +06: 30

It actually gets worse when I insert any date that was before 1942 -

INSERT INTO "test" ("username", "dob") VALUES (E'Spock', E'1941-01-01 11:30:11');

mydb=> select username, dob from test where username='Spock';
 username |             dob              
----------+------------------------------
 Spock    | 1941-01-01 11:30:11+05:53:20
(1 row)

      

        
        
        
      

    

Now the time zone value is completely garbled and the date cannot be parsed.

I would appreciate any help with this.

My time zone is Asia / Kolkata (GMT + 05: 30).

Update: I tried to enter data by specifying TZ explicitly like this:

INSERT INTO "test" ("username", "dob") VALUES (E'McCoy', E'1941-01-25 00:20:30+05:30');

      

        
        
        
      

    

Even then, it didn't work.

mydb=> select username, dob from test where username='McCoy';
 username |             dob              
----------+------------------------------
 McCoy    | 1941-01-25 00:43:50+05:53:20
(1 row)