diff --git a/pytz/__init__.py b/pytz/__init__.py
index e2f49fa..65c1d11 100644
--- a/pytz/__init__.py
+++ b/pytz/__init__.py
@@ -74,6 +74,9 @@ else:  # Python 2.x
         """
         return s.encode('ASCII')
 
+_tzinfo_dir = os.getenv('PYTZ_TZDATADIR') or '/usr/share/zoneinfo'
+if _tzinfo_dir.endswith(os.sep):
+    _tzinfo_dir = _tzinfo_dir[:-1]
 
 def open_resource(name):
     """Open a resource from the zoneinfo subdir for reading.
--- pytz-2022.2/pytz/__init__.py~	2022-08-12 08:18:18.284242046 -0500
+++ pytz-2022.2/pytz/__init__.py	2022-08-12 08:40:34.523880888 -0500
@@ -91,23 +91,8 @@
     for part in name_parts:
         if part == os.path.pardir or os.sep in part:
             raise ValueError('Bad path segment: %r' % part)
-    zoneinfo_dir = os.environ.get('PYTZ_TZDATADIR', None)
-    if zoneinfo_dir is not None:
-        filename = os.path.join(zoneinfo_dir, *name_parts)
-    else:
-        filename = os.path.join(os.path.dirname(__file__),
-                                'zoneinfo', *name_parts)
-        if not os.path.exists(filename):
-            # http://bugs.launchpad.net/bugs/383171 - we avoid using this
-            # unless absolutely necessary to help when a broken version of
-            # pkg_resources is installed.
-            try:
-                from pkg_resources import resource_stream
-            except ImportError:
-                resource_stream = None
-
-            if resource_stream is not None:
-                return resource_stream(__name__, 'zoneinfo/' + name)
+    zoneinfo_dir = os.environ.get('PYTZ_TZDATADIR', _tzinfo_dir)
+    filename = os.path.join(zoneinfo_dir, *name_parts)
     return open(filename, 'rb')


505,1100c505,515
< all_timezones = \
< ['Africa/Abidjan',
<  'Africa/Accra',
<  'Africa/Addis_Ababa',
<  'Africa/Algiers',
<  'Africa/Asmara',
<  'Africa/Asmera',
<  'Africa/Bamako',
<  'Africa/Bangui',
<  'Africa/Banjul',
<  'Africa/Bissau',
<  'Africa/Blantyre',
<  'Africa/Brazzaville',
<  'Africa/Bujumbura',
<  'Africa/Cairo',
<  'Africa/Casablanca',
<  'Africa/Ceuta',
<  'Africa/Conakry',
<  'Africa/Dakar',
<  'Africa/Dar_es_Salaam',
<  'Africa/Djibouti',
<  'Africa/Douala',
<  'Africa/El_Aaiun',
<  'Africa/Freetown',
<  'Africa/Gaborone',
<  'Africa/Harare',
<  'Africa/Johannesburg',
<  'Africa/Juba',
<  'Africa/Kampala',
<  'Africa/Khartoum',
<  'Africa/Kigali',
<  'Africa/Kinshasa',
<  'Africa/Lagos',
<  'Africa/Libreville',
<  'Africa/Lome',
<  'Africa/Luanda',
<  'Africa/Lubumbashi',
<  'Africa/Lusaka',
<  'Africa/Malabo',
<  'Africa/Maputo',
<  'Africa/Maseru',
<  'Africa/Mbabane',
<  'Africa/Mogadishu',
<  'Africa/Monrovia',
<  'Africa/Nairobi',
<  'Africa/Ndjamena',
<  'Africa/Niamey',
<  'Africa/Nouakchott',
<  'Africa/Ouagadougou',
<  'Africa/Porto-Novo',
<  'Africa/Sao_Tome',
<  'Africa/Timbuktu',
<  'Africa/Tripoli',
<  'Africa/Tunis',
<  'Africa/Windhoek',
<  'America/Adak',
<  'America/Anchorage',
<  'America/Anguilla',
<  'America/Antigua',
<  'America/Araguaina',
<  'America/Argentina/Buenos_Aires',
<  'America/Argentina/Catamarca',
<  'America/Argentina/ComodRivadavia',
<  'America/Argentina/Cordoba',
<  'America/Argentina/Jujuy',
<  'America/Argentina/La_Rioja',
<  'America/Argentina/Mendoza',
<  'America/Argentina/Rio_Gallegos',
<  'America/Argentina/Salta',
<  'America/Argentina/San_Juan',
<  'America/Argentina/San_Luis',
<  'America/Argentina/Tucuman',
<  'America/Argentina/Ushuaia',
<  'America/Aruba',
<  'America/Asuncion',
<  'America/Atikokan',
<  'America/Atka',
<  'America/Bahia',
<  'America/Bahia_Banderas',
<  'America/Barbados',
<  'America/Belem',
<  'America/Belize',
<  'America/Blanc-Sablon',
<  'America/Boa_Vista',
<  'America/Bogota',
<  'America/Boise',
<  'America/Buenos_Aires',
<  'America/Cambridge_Bay',
<  'America/Campo_Grande',
<  'America/Cancun',
<  'America/Caracas',
<  'America/Catamarca',
<  'America/Cayenne',
<  'America/Cayman',
<  'America/Chicago',
<  'America/Chihuahua',
<  'America/Coral_Harbour',
<  'America/Cordoba',
<  'America/Costa_Rica',
<  'America/Creston',
<  'America/Cuiaba',
<  'America/Curacao',
<  'America/Danmarkshavn',
<  'America/Dawson',
<  'America/Dawson_Creek',
<  'America/Denver',
<  'America/Detroit',
<  'America/Dominica',
<  'America/Edmonton',
<  'America/Eirunepe',
<  'America/El_Salvador',
<  'America/Ensenada',
<  'America/Fort_Nelson',
<  'America/Fort_Wayne',
<  'America/Fortaleza',
<  'America/Glace_Bay',
<  'America/Godthab',
<  'America/Goose_Bay',
<  'America/Grand_Turk',
<  'America/Grenada',
<  'America/Guadeloupe',
<  'America/Guatemala',
<  'America/Guayaquil',
<  'America/Guyana',
<  'America/Halifax',
<  'America/Havana',
<  'America/Hermosillo',
<  'America/Indiana/Indianapolis',
<  'America/Indiana/Knox',
<  'America/Indiana/Marengo',
<  'America/Indiana/Petersburg',
<  'America/Indiana/Tell_City',
<  'America/Indiana/Vevay',
<  'America/Indiana/Vincennes',
<  'America/Indiana/Winamac',
<  'America/Indianapolis',
<  'America/Inuvik',
<  'America/Iqaluit',
<  'America/Jamaica',
<  'America/Jujuy',
<  'America/Juneau',
<  'America/Kentucky/Louisville',
<  'America/Kentucky/Monticello',
<  'America/Knox_IN',
<  'America/Kralendijk',
<  'America/La_Paz',
<  'America/Lima',
<  'America/Los_Angeles',
<  'America/Louisville',
<  'America/Lower_Princes',
<  'America/Maceio',
<  'America/Managua',
<  'America/Manaus',
<  'America/Marigot',
<  'America/Martinique',
<  'America/Matamoros',
<  'America/Mazatlan',
<  'America/Mendoza',
<  'America/Menominee',
<  'America/Merida',
<  'America/Metlakatla',
<  'America/Mexico_City',
<  'America/Miquelon',
<  'America/Moncton',
<  'America/Monterrey',
<  'America/Montevideo',
<  'America/Montreal',
<  'America/Montserrat',
<  'America/Nassau',
<  'America/New_York',
<  'America/Nipigon',
<  'America/Nome',
<  'America/Noronha',
<  'America/North_Dakota/Beulah',
<  'America/North_Dakota/Center',
<  'America/North_Dakota/New_Salem',
<  'America/Nuuk',
<  'America/Ojinaga',
<  'America/Panama',
<  'America/Pangnirtung',
<  'America/Paramaribo',
<  'America/Phoenix',
<  'America/Port-au-Prince',
<  'America/Port_of_Spain',
<  'America/Porto_Acre',
<  'America/Porto_Velho',
<  'America/Puerto_Rico',
<  'America/Punta_Arenas',
<  'America/Rainy_River',
<  'America/Rankin_Inlet',
<  'America/Recife',
<  'America/Regina',
<  'America/Resolute',
<  'America/Rio_Branco',
<  'America/Rosario',
<  'America/Santa_Isabel',
<  'America/Santarem',
<  'America/Santiago',
<  'America/Santo_Domingo',
<  'America/Sao_Paulo',
<  'America/Scoresbysund',
<  'America/Shiprock',
<  'America/Sitka',
<  'America/St_Barthelemy',
<  'America/St_Johns',
<  'America/St_Kitts',
<  'America/St_Lucia',
<  'America/St_Thomas',
<  'America/St_Vincent',
<  'America/Swift_Current',
<  'America/Tegucigalpa',
<  'America/Thule',
<  'America/Thunder_Bay',
<  'America/Tijuana',
<  'America/Toronto',
<  'America/Tortola',
<  'America/Vancouver',
<  'America/Virgin',
<  'America/Whitehorse',
<  'America/Winnipeg',
<  'America/Yakutat',
<  'America/Yellowknife',
<  'Antarctica/Casey',
<  'Antarctica/Davis',
<  'Antarctica/DumontDUrville',
<  'Antarctica/Macquarie',
<  'Antarctica/Mawson',
<  'Antarctica/McMurdo',
<  'Antarctica/Palmer',
<  'Antarctica/Rothera',
<  'Antarctica/South_Pole',
<  'Antarctica/Syowa',
<  'Antarctica/Troll',
<  'Antarctica/Vostok',
<  'Arctic/Longyearbyen',
<  'Asia/Aden',
<  'Asia/Almaty',
<  'Asia/Amman',
<  'Asia/Anadyr',
<  'Asia/Aqtau',
<  'Asia/Aqtobe',
<  'Asia/Ashgabat',
<  'Asia/Ashkhabad',
<  'Asia/Atyrau',
<  'Asia/Baghdad',
<  'Asia/Bahrain',
<  'Asia/Baku',
<  'Asia/Bangkok',
<  'Asia/Barnaul',
<  'Asia/Beirut',
<  'Asia/Bishkek',
<  'Asia/Brunei',
<  'Asia/Calcutta',
<  'Asia/Chita',
<  'Asia/Choibalsan',
<  'Asia/Chongqing',
<  'Asia/Chungking',
<  'Asia/Colombo',
<  'Asia/Dacca',
<  'Asia/Damascus',
<  'Asia/Dhaka',
<  'Asia/Dili',
<  'Asia/Dubai',
<  'Asia/Dushanbe',
<  'Asia/Famagusta',
<  'Asia/Gaza',
<  'Asia/Harbin',
<  'Asia/Hebron',
<  'Asia/Ho_Chi_Minh',
<  'Asia/Hong_Kong',
<  'Asia/Hovd',
<  'Asia/Irkutsk',
<  'Asia/Istanbul',
<  'Asia/Jakarta',
<  'Asia/Jayapura',
<  'Asia/Jerusalem',
<  'Asia/Kabul',
<  'Asia/Kamchatka',
<  'Asia/Karachi',
<  'Asia/Kashgar',
<  'Asia/Kathmandu',
<  'Asia/Katmandu',
<  'Asia/Khandyga',
<  'Asia/Kolkata',
<  'Asia/Krasnoyarsk',
<  'Asia/Kuala_Lumpur',
<  'Asia/Kuching',
<  'Asia/Kuwait',
<  'Asia/Macao',
<  'Asia/Macau',
<  'Asia/Magadan',
<  'Asia/Makassar',
<  'Asia/Manila',
<  'Asia/Muscat',
<  'Asia/Nicosia',
<  'Asia/Novokuznetsk',
<  'Asia/Novosibirsk',
<  'Asia/Omsk',
<  'Asia/Oral',
<  'Asia/Phnom_Penh',
<  'Asia/Pontianak',
<  'Asia/Pyongyang',
<  'Asia/Qatar',
<  'Asia/Qostanay',
<  'Asia/Qyzylorda',
<  'Asia/Rangoon',
<  'Asia/Riyadh',
<  'Asia/Saigon',
<  'Asia/Sakhalin',
<  'Asia/Samarkand',
<  'Asia/Seoul',
<  'Asia/Shanghai',
<  'Asia/Singapore',
<  'Asia/Srednekolymsk',
<  'Asia/Taipei',
<  'Asia/Tashkent',
<  'Asia/Tbilisi',
<  'Asia/Tehran',
<  'Asia/Tel_Aviv',
<  'Asia/Thimbu',
<  'Asia/Thimphu',
<  'Asia/Tokyo',
<  'Asia/Tomsk',
<  'Asia/Ujung_Pandang',
<  'Asia/Ulaanbaatar',
<  'Asia/Ulan_Bator',
<  'Asia/Urumqi',
<  'Asia/Ust-Nera',
<  'Asia/Vientiane',
<  'Asia/Vladivostok',
<  'Asia/Yakutsk',
<  'Asia/Yangon',
<  'Asia/Yekaterinburg',
<  'Asia/Yerevan',
<  'Atlantic/Azores',
<  'Atlantic/Bermuda',
<  'Atlantic/Canary',
<  'Atlantic/Cape_Verde',
<  'Atlantic/Faeroe',
<  'Atlantic/Faroe',
<  'Atlantic/Jan_Mayen',
<  'Atlantic/Madeira',
<  'Atlantic/Reykjavik',
<  'Atlantic/South_Georgia',
<  'Atlantic/St_Helena',
<  'Atlantic/Stanley',
<  'Australia/ACT',
<  'Australia/Adelaide',
<  'Australia/Brisbane',
<  'Australia/Broken_Hill',
<  'Australia/Canberra',
<  'Australia/Currie',
<  'Australia/Darwin',
<  'Australia/Eucla',
<  'Australia/Hobart',
<  'Australia/LHI',
<  'Australia/Lindeman',
<  'Australia/Lord_Howe',
<  'Australia/Melbourne',
<  'Australia/NSW',
<  'Australia/North',
<  'Australia/Perth',
<  'Australia/Queensland',
<  'Australia/South',
<  'Australia/Sydney',
<  'Australia/Tasmania',
<  'Australia/Victoria',
<  'Australia/West',
<  'Australia/Yancowinna',
<  'Brazil/Acre',
<  'Brazil/DeNoronha',
<  'Brazil/East',
<  'Brazil/West',
<  'CET',
<  'CST6CDT',
<  'Canada/Atlantic',
<  'Canada/Central',
<  'Canada/Eastern',
<  'Canada/Mountain',
<  'Canada/Newfoundland',
<  'Canada/Pacific',
<  'Canada/Saskatchewan',
<  'Canada/Yukon',
<  'Chile/Continental',
<  'Chile/EasterIsland',
<  'Cuba',
<  'EET',
<  'EST',
<  'EST5EDT',
<  'Egypt',
<  'Eire',
<  'Etc/GMT',
<  'Etc/GMT+0',
<  'Etc/GMT+1',
<  'Etc/GMT+10',
<  'Etc/GMT+11',
<  'Etc/GMT+12',
<  'Etc/GMT+2',
<  'Etc/GMT+3',
<  'Etc/GMT+4',
<  'Etc/GMT+5',
<  'Etc/GMT+6',
<  'Etc/GMT+7',
<  'Etc/GMT+8',
<  'Etc/GMT+9',
<  'Etc/GMT-0',
<  'Etc/GMT-1',
<  'Etc/GMT-10',
<  'Etc/GMT-11',
<  'Etc/GMT-12',
<  'Etc/GMT-13',
<  'Etc/GMT-14',
<  'Etc/GMT-2',
<  'Etc/GMT-3',
<  'Etc/GMT-4',
<  'Etc/GMT-5',
<  'Etc/GMT-6',
<  'Etc/GMT-7',
<  'Etc/GMT-8',
<  'Etc/GMT-9',
<  'Etc/GMT0',
<  'Etc/Greenwich',
<  'Etc/UCT',
<  'Etc/UTC',
<  'Etc/Universal',
<  'Etc/Zulu',
<  'Europe/Amsterdam',
<  'Europe/Andorra',
<  'Europe/Astrakhan',
<  'Europe/Athens',
<  'Europe/Belfast',
<  'Europe/Belgrade',
<  'Europe/Berlin',
<  'Europe/Bratislava',
<  'Europe/Brussels',
<  'Europe/Bucharest',
<  'Europe/Budapest',
<  'Europe/Busingen',
<  'Europe/Chisinau',
<  'Europe/Copenhagen',
<  'Europe/Dublin',
<  'Europe/Gibraltar',
<  'Europe/Guernsey',
<  'Europe/Helsinki',
<  'Europe/Isle_of_Man',
<  'Europe/Istanbul',
<  'Europe/Jersey',
<  'Europe/Kaliningrad',
<  'Europe/Kiev',
<  'Europe/Kirov',
<  'Europe/Kyiv',
<  'Europe/Lisbon',
<  'Europe/Ljubljana',
<  'Europe/London',
<  'Europe/Luxembourg',
<  'Europe/Madrid',
<  'Europe/Malta',
<  'Europe/Mariehamn',
<  'Europe/Minsk',
<  'Europe/Monaco',
<  'Europe/Moscow',
<  'Europe/Nicosia',
<  'Europe/Oslo',
<  'Europe/Paris',
<  'Europe/Podgorica',
<  'Europe/Prague',
<  'Europe/Riga',
<  'Europe/Rome',
<  'Europe/Samara',
<  'Europe/San_Marino',
<  'Europe/Sarajevo',
<  'Europe/Saratov',
<  'Europe/Simferopol',
<  'Europe/Skopje',
<  'Europe/Sofia',
<  'Europe/Stockholm',
<  'Europe/Tallinn',
<  'Europe/Tirane',
<  'Europe/Tiraspol',
<  'Europe/Ulyanovsk',
<  'Europe/Uzhgorod',
<  'Europe/Vaduz',
<  'Europe/Vatican',
<  'Europe/Vienna',
<  'Europe/Vilnius',
<  'Europe/Volgograd',
<  'Europe/Warsaw',
<  'Europe/Zagreb',
<  'Europe/Zaporozhye',
<  'Europe/Zurich',
<  'GB',
<  'GB-Eire',
<  'GMT',
<  'GMT+0',
<  'GMT-0',
<  'GMT0',
<  'Greenwich',
<  'HST',
<  'Hongkong',
<  'Iceland',
<  'Indian/Antananarivo',
<  'Indian/Chagos',
<  'Indian/Christmas',
<  'Indian/Cocos',
<  'Indian/Comoro',
<  'Indian/Kerguelen',
<  'Indian/Mahe',
<  'Indian/Maldives',
<  'Indian/Mauritius',
<  'Indian/Mayotte',
<  'Indian/Reunion',
<  'Iran',
<  'Israel',
<  'Jamaica',
<  'Japan',
<  'Kwajalein',
<  'Libya',
<  'MET',
<  'MST',
<  'MST7MDT',
<  'Mexico/BajaNorte',
<  'Mexico/BajaSur',
<  'Mexico/General',
<  'NZ',
<  'NZ-CHAT',
<  'Navajo',
<  'PRC',
<  'PST8PDT',
<  'Pacific/Apia',
<  'Pacific/Auckland',
<  'Pacific/Bougainville',
<  'Pacific/Chatham',
<  'Pacific/Chuuk',
<  'Pacific/Easter',
<  'Pacific/Efate',
<  'Pacific/Enderbury',
<  'Pacific/Fakaofo',
<  'Pacific/Fiji',
<  'Pacific/Funafuti',
<  'Pacific/Galapagos',
<  'Pacific/Gambier',
<  'Pacific/Guadalcanal',
<  'Pacific/Guam',
<  'Pacific/Honolulu',
<  'Pacific/Johnston',
<  'Pacific/Kanton',
<  'Pacific/Kiritimati',
<  'Pacific/Kosrae',
<  'Pacific/Kwajalein',
<  'Pacific/Majuro',
<  'Pacific/Marquesas',
<  'Pacific/Midway',
<  'Pacific/Nauru',
<  'Pacific/Niue',
<  'Pacific/Norfolk',
<  'Pacific/Noumea',
<  'Pacific/Pago_Pago',
<  'Pacific/Palau',
<  'Pacific/Pitcairn',
<  'Pacific/Pohnpei',
<  'Pacific/Ponape',
<  'Pacific/Port_Moresby',
<  'Pacific/Rarotonga',
<  'Pacific/Saipan',
<  'Pacific/Samoa',
<  'Pacific/Tahiti',
<  'Pacific/Tarawa',
<  'Pacific/Tongatapu',
<  'Pacific/Truk',
<  'Pacific/Wake',
<  'Pacific/Wallis',
<  'Pacific/Yap',
<  'Poland',
<  'Portugal',
<  'ROC',
<  'ROK',
<  'Singapore',
<  'Turkey',
<  'UCT',
<  'US/Alaska',
<  'US/Aleutian',
<  'US/Arizona',
<  'US/Central',
<  'US/East-Indiana',
<  'US/Eastern',
<  'US/Hawaii',
<  'US/Indiana-Starke',
<  'US/Michigan',
<  'US/Mountain',
<  'US/Pacific',
<  'US/Samoa',
<  'UTC',
<  'Universal',
<  'W-SU',
<  'WET',
<  'Zulu']
---
> all_timezones = []
> for root, dirs, files in os.walk(_tzinfo_dir):
>     for exclude in 'posix', 'right':
>         if exclude in dirs:
>             del dirs[dirs.index(exclude)]
> 
>     all_timezones.extend(os.path.join(root, tz_file)[len(_tzinfo_dir)+1:]
>             for tz_file in files
>             if tz_file not in ['leapseconds', 'README', 'Theory']
>             and '.' not in tz_file)
> 
1105,1542c520,533
< common_timezones = \
< ['Africa/Abidjan',
<  'Africa/Accra',
<  'Africa/Addis_Ababa',
<  'Africa/Algiers',
<  'Africa/Asmara',
<  'Africa/Bamako',
<  'Africa/Bangui',
<  'Africa/Banjul',
<  'Africa/Bissau',
<  'Africa/Blantyre',
<  'Africa/Brazzaville',
<  'Africa/Bujumbura',
<  'Africa/Cairo',
<  'Africa/Casablanca',
<  'Africa/Ceuta',
<  'Africa/Conakry',
<  'Africa/Dakar',
<  'Africa/Dar_es_Salaam',
<  'Africa/Djibouti',
<  'Africa/Douala',
<  'Africa/El_Aaiun',
<  'Africa/Freetown',
<  'Africa/Gaborone',
<  'Africa/Harare',
<  'Africa/Johannesburg',
<  'Africa/Juba',
<  'Africa/Kampala',
<  'Africa/Khartoum',
<  'Africa/Kigali',
<  'Africa/Kinshasa',
<  'Africa/Lagos',
<  'Africa/Libreville',
<  'Africa/Lome',
<  'Africa/Luanda',
<  'Africa/Lubumbashi',
<  'Africa/Lusaka',
<  'Africa/Malabo',
<  'Africa/Maputo',
<  'Africa/Maseru',
<  'Africa/Mbabane',
<  'Africa/Mogadishu',
<  'Africa/Monrovia',
<  'Africa/Nairobi',
<  'Africa/Ndjamena',
<  'Africa/Niamey',
<  'Africa/Nouakchott',
<  'Africa/Ouagadougou',
<  'Africa/Porto-Novo',
<  'Africa/Sao_Tome',
<  'Africa/Tripoli',
<  'Africa/Tunis',
<  'Africa/Windhoek',
<  'America/Adak',
<  'America/Anchorage',
<  'America/Anguilla',
<  'America/Antigua',
<  'America/Araguaina',
<  'America/Argentina/Buenos_Aires',
<  'America/Argentina/Catamarca',
<  'America/Argentina/Cordoba',
<  'America/Argentina/Jujuy',
<  'America/Argentina/La_Rioja',
<  'America/Argentina/Mendoza',
<  'America/Argentina/Rio_Gallegos',
<  'America/Argentina/Salta',
<  'America/Argentina/San_Juan',
<  'America/Argentina/San_Luis',
<  'America/Argentina/Tucuman',
<  'America/Argentina/Ushuaia',
<  'America/Aruba',
<  'America/Asuncion',
<  'America/Atikokan',
<  'America/Bahia',
<  'America/Bahia_Banderas',
<  'America/Barbados',
<  'America/Belem',
<  'America/Belize',
<  'America/Blanc-Sablon',
<  'America/Boa_Vista',
<  'America/Bogota',
<  'America/Boise',
<  'America/Cambridge_Bay',
<  'America/Campo_Grande',
<  'America/Cancun',
<  'America/Caracas',
<  'America/Cayenne',
<  'America/Cayman',
<  'America/Chicago',
<  'America/Chihuahua',
<  'America/Costa_Rica',
<  'America/Creston',
<  'America/Cuiaba',
<  'America/Curacao',
<  'America/Danmarkshavn',
<  'America/Dawson',
<  'America/Dawson_Creek',
<  'America/Denver',
<  'America/Detroit',
<  'America/Dominica',
<  'America/Edmonton',
<  'America/Eirunepe',
<  'America/El_Salvador',
<  'America/Fort_Nelson',
<  'America/Fortaleza',
<  'America/Glace_Bay',
<  'America/Goose_Bay',
<  'America/Grand_Turk',
<  'America/Grenada',
<  'America/Guadeloupe',
<  'America/Guatemala',
<  'America/Guayaquil',
<  'America/Guyana',
<  'America/Halifax',
<  'America/Havana',
<  'America/Hermosillo',
<  'America/Indiana/Indianapolis',
<  'America/Indiana/Knox',
<  'America/Indiana/Marengo',
<  'America/Indiana/Petersburg',
<  'America/Indiana/Tell_City',
<  'America/Indiana/Vevay',
<  'America/Indiana/Vincennes',
<  'America/Indiana/Winamac',
<  'America/Inuvik',
<  'America/Iqaluit',
<  'America/Jamaica',
<  'America/Juneau',
<  'America/Kentucky/Louisville',
<  'America/Kentucky/Monticello',
<  'America/Kralendijk',
<  'America/La_Paz',
<  'America/Lima',
<  'America/Los_Angeles',
<  'America/Lower_Princes',
<  'America/Maceio',
<  'America/Managua',
<  'America/Manaus',
<  'America/Marigot',
<  'America/Martinique',
<  'America/Matamoros',
<  'America/Mazatlan',
<  'America/Menominee',
<  'America/Merida',
<  'America/Metlakatla',
<  'America/Mexico_City',
<  'America/Miquelon',
<  'America/Moncton',
<  'America/Monterrey',
<  'America/Montevideo',
<  'America/Montserrat',
<  'America/Nassau',
<  'America/New_York',
<  'America/Nipigon',
<  'America/Nome',
<  'America/Noronha',
<  'America/North_Dakota/Beulah',
<  'America/North_Dakota/Center',
<  'America/North_Dakota/New_Salem',
<  'America/Nuuk',
<  'America/Ojinaga',
<  'America/Panama',
<  'America/Pangnirtung',
<  'America/Paramaribo',
<  'America/Phoenix',
<  'America/Port-au-Prince',
<  'America/Port_of_Spain',
<  'America/Porto_Velho',
<  'America/Puerto_Rico',
<  'America/Punta_Arenas',
<  'America/Rainy_River',
<  'America/Rankin_Inlet',
<  'America/Recife',
<  'America/Regina',
<  'America/Resolute',
<  'America/Rio_Branco',
<  'America/Santarem',
<  'America/Santiago',
<  'America/Santo_Domingo',
<  'America/Sao_Paulo',
<  'America/Scoresbysund',
<  'America/Sitka',
<  'America/St_Barthelemy',
<  'America/St_Johns',
<  'America/St_Kitts',
<  'America/St_Lucia',
<  'America/St_Thomas',
<  'America/St_Vincent',
<  'America/Swift_Current',
<  'America/Tegucigalpa',
<  'America/Thule',
<  'America/Thunder_Bay',
<  'America/Tijuana',
<  'America/Toronto',
<  'America/Tortola',
<  'America/Vancouver',
<  'America/Whitehorse',
<  'America/Winnipeg',
<  'America/Yakutat',
<  'America/Yellowknife',
<  'Antarctica/Casey',
<  'Antarctica/Davis',
<  'Antarctica/DumontDUrville',
<  'Antarctica/Macquarie',
<  'Antarctica/Mawson',
<  'Antarctica/McMurdo',
<  'Antarctica/Palmer',
<  'Antarctica/Rothera',
<  'Antarctica/Syowa',
<  'Antarctica/Troll',
<  'Antarctica/Vostok',
<  'Arctic/Longyearbyen',
<  'Asia/Aden',
<  'Asia/Almaty',
<  'Asia/Amman',
<  'Asia/Anadyr',
<  'Asia/Aqtau',
<  'Asia/Aqtobe',
<  'Asia/Ashgabat',
<  'Asia/Atyrau',
<  'Asia/Baghdad',
<  'Asia/Bahrain',
<  'Asia/Baku',
<  'Asia/Bangkok',
<  'Asia/Barnaul',
<  'Asia/Beirut',
<  'Asia/Bishkek',
<  'Asia/Brunei',
<  'Asia/Chita',
<  'Asia/Choibalsan',
<  'Asia/Colombo',
<  'Asia/Damascus',
<  'Asia/Dhaka',
<  'Asia/Dili',
<  'Asia/Dubai',
<  'Asia/Dushanbe',
<  'Asia/Famagusta',
<  'Asia/Gaza',
<  'Asia/Hebron',
<  'Asia/Ho_Chi_Minh',
<  'Asia/Hong_Kong',
<  'Asia/Hovd',
<  'Asia/Irkutsk',
<  'Asia/Jakarta',
<  'Asia/Jayapura',
<  'Asia/Jerusalem',
<  'Asia/Kabul',
<  'Asia/Kamchatka',
<  'Asia/Karachi',
<  'Asia/Kathmandu',
<  'Asia/Khandyga',
<  'Asia/Kolkata',
<  'Asia/Krasnoyarsk',
<  'Asia/Kuala_Lumpur',
<  'Asia/Kuching',
<  'Asia/Kuwait',
<  'Asia/Macau',
<  'Asia/Magadan',
<  'Asia/Makassar',
<  'Asia/Manila',
<  'Asia/Muscat',
<  'Asia/Nicosia',
<  'Asia/Novokuznetsk',
<  'Asia/Novosibirsk',
<  'Asia/Omsk',
<  'Asia/Oral',
<  'Asia/Phnom_Penh',
<  'Asia/Pontianak',
<  'Asia/Pyongyang',
<  'Asia/Qatar',
<  'Asia/Qostanay',
<  'Asia/Qyzylorda',
<  'Asia/Riyadh',
<  'Asia/Sakhalin',
<  'Asia/Samarkand',
<  'Asia/Seoul',
<  'Asia/Shanghai',
<  'Asia/Singapore',
<  'Asia/Srednekolymsk',
<  'Asia/Taipei',
<  'Asia/Tashkent',
<  'Asia/Tbilisi',
<  'Asia/Tehran',
<  'Asia/Thimphu',
<  'Asia/Tokyo',
<  'Asia/Tomsk',
<  'Asia/Ulaanbaatar',
<  'Asia/Urumqi',
<  'Asia/Ust-Nera',
<  'Asia/Vientiane',
<  'Asia/Vladivostok',
<  'Asia/Yakutsk',
<  'Asia/Yangon',
<  'Asia/Yekaterinburg',
<  'Asia/Yerevan',
<  'Atlantic/Azores',
<  'Atlantic/Bermuda',
<  'Atlantic/Canary',
<  'Atlantic/Cape_Verde',
<  'Atlantic/Faroe',
<  'Atlantic/Madeira',
<  'Atlantic/Reykjavik',
<  'Atlantic/South_Georgia',
<  'Atlantic/St_Helena',
<  'Atlantic/Stanley',
<  'Australia/Adelaide',
<  'Australia/Brisbane',
<  'Australia/Broken_Hill',
<  'Australia/Darwin',
<  'Australia/Eucla',
<  'Australia/Hobart',
<  'Australia/Lindeman',
<  'Australia/Lord_Howe',
<  'Australia/Melbourne',
<  'Australia/Perth',
<  'Australia/Sydney',
<  'Canada/Atlantic',
<  'Canada/Central',
<  'Canada/Eastern',
<  'Canada/Mountain',
<  'Canada/Newfoundland',
<  'Canada/Pacific',
<  'Europe/Amsterdam',
<  'Europe/Andorra',
<  'Europe/Astrakhan',
<  'Europe/Athens',
<  'Europe/Belgrade',
<  'Europe/Berlin',
<  'Europe/Bratislava',
<  'Europe/Brussels',
<  'Europe/Bucharest',
<  'Europe/Budapest',
<  'Europe/Busingen',
<  'Europe/Chisinau',
<  'Europe/Copenhagen',
<  'Europe/Dublin',
<  'Europe/Gibraltar',
<  'Europe/Guernsey',
<  'Europe/Helsinki',
<  'Europe/Isle_of_Man',
<  'Europe/Istanbul',
<  'Europe/Jersey',
<  'Europe/Kaliningrad',
<  'Europe/Kirov',
<  'Europe/Kyiv',
<  'Europe/Lisbon',
<  'Europe/Ljubljana',
<  'Europe/London',
<  'Europe/Luxembourg',
<  'Europe/Madrid',
<  'Europe/Malta',
<  'Europe/Mariehamn',
<  'Europe/Minsk',
<  'Europe/Monaco',
<  'Europe/Moscow',
<  'Europe/Oslo',
<  'Europe/Paris',
<  'Europe/Podgorica',
<  'Europe/Prague',
<  'Europe/Riga',
<  'Europe/Rome',
<  'Europe/Samara',
<  'Europe/San_Marino',
<  'Europe/Sarajevo',
<  'Europe/Saratov',
<  'Europe/Simferopol',
<  'Europe/Skopje',
<  'Europe/Sofia',
<  'Europe/Stockholm',
<  'Europe/Tallinn',
<  'Europe/Tirane',
<  'Europe/Ulyanovsk',
<  'Europe/Vaduz',
<  'Europe/Vatican',
<  'Europe/Vienna',
<  'Europe/Vilnius',
<  'Europe/Volgograd',
<  'Europe/Warsaw',
<  'Europe/Zagreb',
<  'Europe/Zurich',
<  'GMT',
<  'Indian/Antananarivo',
<  'Indian/Chagos',
<  'Indian/Christmas',
<  'Indian/Cocos',
<  'Indian/Comoro',
<  'Indian/Kerguelen',
<  'Indian/Mahe',
<  'Indian/Maldives',
<  'Indian/Mauritius',
<  'Indian/Mayotte',
<  'Indian/Reunion',
<  'Pacific/Apia',
<  'Pacific/Auckland',
<  'Pacific/Bougainville',
<  'Pacific/Chatham',
<  'Pacific/Chuuk',
<  'Pacific/Easter',
<  'Pacific/Efate',
<  'Pacific/Fakaofo',
<  'Pacific/Fiji',
<  'Pacific/Funafuti',
<  'Pacific/Galapagos',
<  'Pacific/Gambier',
<  'Pacific/Guadalcanal',
<  'Pacific/Guam',
<  'Pacific/Honolulu',
<  'Pacific/Kanton',
<  'Pacific/Kiritimati',
<  'Pacific/Kosrae',
<  'Pacific/Kwajalein',
<  'Pacific/Majuro',
<  'Pacific/Marquesas',
<  'Pacific/Midway',
<  'Pacific/Nauru',
<  'Pacific/Niue',
<  'Pacific/Norfolk',
<  'Pacific/Noumea',
<  'Pacific/Pago_Pago',
<  'Pacific/Palau',
<  'Pacific/Pitcairn',
<  'Pacific/Pohnpei',
<  'Pacific/Port_Moresby',
<  'Pacific/Rarotonga',
<  'Pacific/Saipan',
<  'Pacific/Tahiti',
<  'Pacific/Tarawa',
<  'Pacific/Tongatapu',
<  'Pacific/Wake',
<  'Pacific/Wallis',
<  'US/Alaska',
<  'US/Arizona',
<  'US/Central',
<  'US/Eastern',
<  'US/Hawaii',
<  'US/Mountain',
<  'US/Pacific',
<  'UTC']
---
> with open(os.path.join(_tzinfo_dir, 'zone.tab')) as zonetab:
>     common_timezones = [l.split()[2]
>             for l in zonetab
>             if l != '' and l[0] != '#']
> common_timezones.extend(
>         ['GMT',
>          'US/Alaska',
>          'US/Arizona',
>          'US/Central',
>          'US/Eastern',
>          'US/Hawaii',
>          'US/Mountain',
>          'US/Pacific',
>          'UTC'])