This file is indexed.

/usr/share/postgresql/9.5/timezonesets/America.txt is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

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

The actual contents of the file can be viewed below.

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#
# NOTE:
#   This file is NOT loaded by the PostgreSQL database.  It just serves as
#   a template for timezones you could need.  See the `Date/Time Support'
#   appendix in the PostgreSQL documentation for more information.
#
# src/timezone/tznames/America.txt
#

# Acre time is sometimes called Acre Standard Time (AST) which leads to a
# conflict with AST (see below at AST)
ACT    -18000    # Acre Time (obsolete)
# CONFLICT! ACST is not unique
# Other timezones:
#  - ACST: Australian Central Standard Time
ACST   -14400 D  # Acre Summer Time (obsolete, not in IANA database)
ADT    -10800 D  # Atlantic Daylight Time
                 #     (America/Glace_Bay)
                 #     (America/Goose_Bay)
                 #     (America/Halifax)
                 #     (America/Thule)
                 #     (Atlantic/Bermuda)
AKDT   -28800 D  # Alaska Daylight Time
                 #     (America/Anchorage)
                 #     (America/Juneau)
                 #     (America/Nome)
                 #     (America/Yakutat)
AKST   -32400    # Alaska Standard Time
                 #     (America/Anchorage)
                 #     (America/Juneau)
                 #     (America/Nome)
                 #     (America/Yakutat)
# CONFLICT! AMST is not unique
# Other timezones:
#  - AMST: Armenia Summer Time (Asia)
AMST   -10800 D  # Amazon Summer Time (obsolete)
# CONFLICT! AMT is not unique
# Other timezones:
#  - AMT: Armenia Time (Asia)
AMT    -14400    # Amazon Time (obsolete)
ART    America/Argentina/Buenos_Aires  # Argentina Time (obsolete)
ARST    America/Argentina/Buenos_Aires  # Argentina Summer Time (obsolete)
# CONFLICT! AST is not unique
# Other timezones:
#  - AST: Arabic Standard Time (Asia)
#  - AST: Al Manamah Standard Time (Asia) same offset as Arabia Standard Time
#  - AST/ACT: Acre Standard Time (America) listed as ACT
#  - AST: Anguilla Standard Time (America) same offset
#  - AST: Antigua Standard Time (America) same offset
#  - AST: Antilles Standard Time (America) same offset
AST    -14400    # Atlantic Standard Time
                 #     (America/Anguilla)
                 #     (America/Antigua)
                 #     (America/Aruba)
                 #     (America/Curacao)
                 #     (America/Dominica)
                 #     (America/Glace_Bay)
                 #     (America/Goose_Bay)
                 #     (America/Grenada)
                 #     (America/Guadeloupe)
                 #     (America/Halifax)
                 #     (America/Martinique)
                 #     (America/Montserrat)
                 #     (America/Port_of_Spain)
                 #     (America/Puerto_Rico)
                 #     (America/Santo_Domingo)
                 #     (America/St_Kitts)
                 #     (America/St_Lucia)
                 #     (America/St_Thomas)
                 #     (America/St_Vincent)
                 #     (America/Thule)
                 #     (America/Tortola)
                 #     (Atlantic/Bermuda)
BOT    -14400    # Bolivia Time (obsolete)
BRA    -10800    # Brazil Time (not in IANA database)
BRST    -7200 D  # Brasil Summer Time (obsolete)
BRT    -10800    # Brasil Time (obsolete)
# CONFLICT! CDT is not unique
# Other timezones:
#  - CDT: Central Daylight Time (America)
#  - CDT: Mexico Central Daylight Time (America)
#  - CDT: Canada Central Daylight Time (America)
CDT    -14400 D  # Cuba Central Daylight Time
                 #     (America/Havana)
# CONFLICT! CDT is not unique
# Other timezones:
#  - CDT: Mexico Central Daylight Time (America)
#  - CDT: Cuba Central Daylight Time (America)
#  - CDT: Canada Central Daylight Time (America)
CDT    -18000 D  # Central Daylight Time
                 #     (America/Chicago)
                 #     (America/Menominee)
                 #     (America/Merida)
                 #     (America/Mexico_City)
                 #     (America/Monterrey)
                 #     (America/North_Dakota/Center)
                 #     (America/Rainy_River)
                 #     (America/Rankin_Inlet)
                 #     (America/Winnipeg)
CLST   -10800 D  # Chile Summer Time (obsolete)
CLT    America/Santiago  # Chile Time (obsolete)
COT    -18000    # Columbia Time (obsolete)
# CONFLICT! CST is not unique
# Other timezones:
#  - CST: Central Standard Time (Australia)
#  - CST: Central Standard Time (America)
#  - CST: China Standard Time (Asia)
CST    -18000    # Cuba Central Standard Time (America)
                 #     (America/Havana)
# CONFLICT! CST is not unique
# Other timezones:
#  - CST: Central Standard Time (Australia)
#  - CST: China Standard Time (Asia)
#  - CST: Cuba Central Standard Time (America)
CST    -21600    # Central Standard Time (America)
                 #     (America/Chicago)
                 #     (America/Menominee)
                 #     (America/Merida)
                 #     (America/Mexico_City)
                 #     (America/Monterrey)
                 #     (America/North_Dakota/Center)
                 #     (America/Rainy_River)
                 #     (America/Rankin_Inlet)
                 #     (America/Regina)
                 #     (America/Swift_Current)
                 #     (America/Winnipeg)
ECT    -18000    # Ecuador Time (obsolete)
EDT    -14400 D  # Eastern Daylight Saving Time
                 #     (America/Detroit)
                 #     (America/Grand_Turk)
                 #     (America/Indiana/Indianapolis)
                 #     (America/Indiana/Knox)
                 #     (America/Indiana/Marengo)
                 #     (America/Indiana/Vevay)
                 #     (America/Iqaluit)
                 #     (America/Kentucky/Louisville)
                 #     (America/Kentucky/Monticello)
                 #     (America/Montreal)
                 #     (America/Nassau)
                 #     (America/New_York)
                 #     (America/Nipigon)
                 #     (America/Pangnirtung)
                 #     (America/Thunder_Bay)
                 #     (America/Toronto)
EGST        0 D  # East Greenland Summer Time (obsolete)
EGT     -3600    # East Greenland Time (Svalbard & Jan Mayen) (obsolete)
# CONFLICT! EST is not unique
# Other timezones:
#  - EST: Eastern Standard Time (Australia)
EST    -18000    # Eastern Standard Time (America)
                 #     (America/Cancun)
                 #     (America/Cayman)
                 #     (America/Coral_Harbour)
                 #     (America/Detroit)
                 #     (America/Grand_Turk)
                 #     (America/Indiana/Indianapolis)
                 #     (America/Indiana/Knox)
                 #     (America/Indiana/Marengo)
                 #     (America/Indiana/Vevay)
                 #     (America/Iqaluit)
                 #     (America/Jamaica)
                 #     (America/Kentucky/Louisville)
                 #     (America/Kentucky/Monticello)
                 #     (America/Montreal)
                 #     (America/Nassau)
                 #     (America/New_York)
                 #     (America/Nipigon)
                 #     (America/Panama)
                 #     (America/Pangnirtung)
                 #     (America/Thunder_Bay)
                 #     (America/Toronto)
FNT     -7200    # Fernando de Noronha Time (obsolete)
FNST    -3600 D  # Fernando de Noronha Summer Time (obsolete)
GFT    -10800    # French Guiana Time (obsolete)
GMT         0    # Greenwich Mean Time
                 #     (Africa/Abidjan)
                 #     (Africa/Bamako)
                 #     (Africa/Banjul)
                 #     (Africa/Bissau)
                 #     (Africa/Conakry)
                 #     (Africa/Dakar)
                 #     (Africa/Lome)
                 #     (Africa/Monrovia)
                 #     (Africa/Nouakchott)
                 #     (Africa/Ouagadougou)
                 #     (Africa/Sao_Tome)
                 #     (America/Danmarkshavn)
                 #     (Atlantic/Reykjavik)
                 #     (Atlantic/St_Helena)
                 #     (Etc/GMT)
                 #     (Europe/Dublin)
                 #     (Europe/London)
GYT    America/Guyana  # Guyana Time (obsolete)
HADT   -32400 D  # Hawaii-Aleutian Daylight Time (obsolete abbreviation)
                 #     (America/Adak)
HAST   -36000    # Hawaii-Aleutian Standard Time (obsolete abbreviation)
                 #     (America/Adak)
HDT    -32400 D  # Hawaiian-Aleutian Daylight Time
                 #     (America/Adak)
MDT    -21600 D  # Mexico Mountain Daylight Time
                 # Mountain Daylight Time
                 #     (America/Boise)
                 #     (America/Cambridge_Bay)
                 #     (America/Chihuahua)
                 #     (America/Denver)
                 #     (America/Edmonton)
                 #     (America/Inuvik)
                 #     (America/Mazatlan)
                 #     (America/Yellowknife)
MST    -25200    # Mexico Mountain Standard Time
                 # Mountain Standard Time
                 #     (America/Boise)
                 #     (America/Cambridge_Bay)
                 #     (America/Chihuahua)
                 #     (America/Dawson_Creek)
                 #     (America/Denver)
                 #     (America/Edmonton)
                 #     (America/Hermosillo)
                 #     (America/Inuvik)
                 #     (America/Mazatlan)
                 #     (America/Phoenix)
                 #     (America/Yellowknife)
NDT     -9000 D  # Newfoundland Daylight Time
                 #     (America/St_Johns)
# CONFLICT! NFT is not unique
# Other timezones:
#  - NFT: Norfolk Time (Pacific)
NFT    -12600    # Newfoundland Time (not in IANA database)
NST    -12600    # Newfoundland Standard Time
                 #     (America/St_Johns)
PDT    -25200 D  # Pacific Daylight Time
                 #     (America/Dawson)
                 #     (America/Los_Angeles)
                 #     (America/Tijuana)
                 #     (America/Vancouver)
                 #     (America/Whitehorse)
PET    -18000    # Peru Time (obsolete)
PMDT    -7200 D  # Pierre & Miquelon Daylight Time (obsolete)
PMST   -10800    # Pierre & Miquelon Standard Time (obsolete)
PST    -28800    # Pacific Standard Time
                 #     (America/Dawson)
                 #     (America/Los_Angeles)
                 #     (America/Tijuana)
                 #     (America/Vancouver)
                 #     (America/Whitehorse)
                 #     (Pacific/Pitcairn)
PYST   -10800 D  # Paraguay Summer Time (obsolete)
PYT    America/Asuncion  # Paraguay Time (obsolete)
SRT    America/Paramaribo  # Suriname Time (obsolete)
UYST    -7200 D  # Uruguay Summer Time (obsolete)
UYT    -10800    # Uruguay Time (obsolete)
VET    America/Caracas  # Venezuela Time (obsolete)
WGST    -7200 D  # Western Greenland Summer Time (obsolete)
WGT    -10800    # West Greenland Time (obsolete)