Suppose am at the server-end, how could i get the client-time. Its really troublesome when compared with the timezone column in a table.
Not sure what you are getting at. You are always connected to the server _through_ a client and you _tell_ the server your timezone preferences.
As long as you are using timestamptz and as long as the client properly sets its preferred time-zone prior to issuing queries or gives fully-qualified timestamps with TZ, then you are fine.
Alternately, you can use (for libpq clients) the PGTZ environment variable.
Or you can set things on a per-user basis: alter user foo set timezone to 'SOMETZ';
Or for things like web-apps where the client-side of the connection to the database is probably through a single database-user and the actual users are all over the place you can set up a table of user-preferences and set the timezone appropriately.
