This file is indexed.

/usr/share/postgresql/9.1/timezonesets/India is in postgresql-9.1 9.1.3-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Time zone configuration file for set "India"

# In order to use this file, you need to set the run-time parameter
# timezone_abbreviations to 'India'.  See the `Date/Time Support'
# appendix in the PostgreSQL documentation for more information.
#
# src/timezone/tznames/India


# include the default set
@INCLUDE Default

# most timezones are already defined in the default set. With the OVERRIDE
# option, PostgreSQL will use the new definitions instead of throwing an error
# in case of a conflict.
@OVERRIDE

IST     19800    # Indian Standard Time
                 #     (Asia/Calcutta)