osTimezone.c

/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#define ALLOW_FORBID_FUNC
#define _DEFAULT_SOURCE
#include "os.h"

#ifdef WINDOWS
#if (_WIN64)
#include <iphlpapi.h>
#include <mswsock.h>
#include <psapi.h>
#include <stdio.h>
#include <windows.h>
#include <ws2tcpip.h>
#pragma comment(lib, "Mswsock.lib ")
#endif
#include <objbase.h>
#pragma warning(push)
#pragma warning(disable : 4091)
#include <DbgHelp.h>
#pragma warning(pop)

char *win_tz[139][2]={{"China Standard Time", "Asia/Shanghai"},
  {"AUS Central Standard Time", "Australia/Darwin"},
  {"AUS Eastern Standard Time", "Australia/Sydney"},
  {"Afghanistan Standard Time", "Asia/Kabul"},
  {"Alaskan Standard Time", "America/Anchorage"},
  {"Aleutian Standard Time", "America/Adak"},
  {"Altai Standard Time", "Asia/Barnaul"},
  {"Arab Standard Time", "Asia/Riyadh"},
  {"Arabian Standard Time", "Asia/Dubai"},
  {"Arabic Standard Time", "Asia/Baghdad"},
  {"Argentina Standard Time", "America/Buenos_Aires"},
  {"Astrakhan Standard Time", "Europe/Astrakhan"},
  {"Atlantic Standard Time", "America/Halifax"},
  {"Aus Central W. Standard Time", "Australia/Eucla"},
  {"Azerbaijan Standard Time", "Asia/Baku"},
  {"Azores Standard Time", "Atlantic/Azores"},
  {"Bahia Standard Time", "America/Bahia"},
  {"Bangladesh Standard Time", "Asia/Dhaka"},
  {"Belarus Standard Time", "Europe/Minsk"},
  {"Bougainville Standard Time", "Pacific/Bougainville"},
  {"Canada Central Standard Time", "America/Regina"},
  {"Cape Verde Standard Time", "Atlantic/Cape_Verde"},
  {"Caucasus Standard Time", "Asia/Yerevan"},
  {"Cen. Australia Standard Time", "Australia/Adelaide"},
  {"Central America Standard Time", "America/Guatemala"},
  {"Central Asia Standard Time", "Asia/Almaty"},
  {"Central Brazilian Standard Time", "America/Cuiaba"},
  {"Central Europe Standard Time", "Europe/Budapest"},
  {"Central European Standard Time", "Europe/Warsaw"},
  {"Central Pacific Standard Time", "Pacific/Guadalcanal"},
  {"Central Standard Time", "America/Chicago"},
  {"Central Standard Time (Mexico)", "America/Mexico_City"},
  {"Chatham Islands Standard Time", "Pacific/Chatham"},
  {"Cuba Standard Time", "America/Havana"},
  {"Dateline Standard Time", "Etc/GMT+12"},
  {"E. Africa Standard Time", "Africa/Nairobi"},
  {"E. Australia Standard Time", "Australia/Brisbane"},
  {"E. Europe Standard Time", "Europe/Chisinau"},
  {"E. South America Standard Time", "America/Sao_Paulo"},
  {"Easter Island Standard Time", "Pacific/Easter"},
  {"Eastern Standard Time", "America/New_York"},
  {"Eastern Standard Time (Mexico)", "America/Cancun"},
  {"Egypt Standard Time", "Africa/Cairo"},
  {"Ekaterinburg Standard Time", "Asia/Yekaterinburg"},
  {"FLE Standard Time", "Europe/Kiev"},
  {"Fiji Standard Time", "Pacific/Fiji"},
  {"GMT Standard Time", "Europe/London"},
  {"GTB Standard Time", "Europe/Bucharest"},
  {"Georgian Standard Time", "Asia/Tbilisi"},
  {"Greenland Standard Time", "America/Godthab"},
  {"Greenwich Standard Time", "Atlantic/Reykjavik"},
  {"Haiti Standard Time", "America/Port-au-Prince"},
  {"Hawaiian Standard Time", "Pacific/Honolulu"},
  {"India Standard Time", "Asia/Calcutta"},
  {"Iran Standard Time", "Asia/Tehran"},
  {"Israel Standard Time", "Asia/Jerusalem"},
  {"Jordan Standard Time", "Asia/Amman"},
  {"Kaliningrad Standard Time", "Europe/Kaliningrad"},
  {"Korea Standard Time", "Asia/Seoul"},
  {"Libya Standard Time", "Africa/Tripoli"},
  {"Line Islands Standard Time", "Pacific/Kiritimati"},
  {"Lord Howe Standard Time", "Australia/Lord_Howe"},
  {"Magadan Standard Time", "Asia/Magadan"},
  {"Magallanes Standard Time", "America/Punta_Arenas"},
  {"Marquesas Standard Time", "Pacific/Marquesas"},
  {"Mauritius Standard Time", "Indian/Mauritius"},
  {"Middle East Standard Time", "Asia/Beirut"},
  {"Montevideo Standard Time", "America/Montevideo"},
  {"Morocco Standard Time", "Africa/Casablanca"},
  {"Mountain Standard Time", "America/Denver"},
  {"Mountain Standard Time (Mexico)", "America/Chihuahua"},
  {"Myanmar Standard Time", "Asia/Rangoon"},
  {"N. Central Asia Standard Time", "Asia/Novosibirsk"},
  {"Namibia Standard Time", "Africa/Windhoek"},
  {"Nepal Standard Time", "Asia/Katmandu"},
  {"New Zealand Standard Time", "Pacific/Auckland"},
  {"Newfoundland Standard Time", "America/St_Johns"},
  {"Norfolk Standard Time", "Pacific/Norfolk"},
  {"North Asia East Standard Time", "Asia/Irkutsk"},
  {"North Asia Standard Time", "Asia/Krasnoyarsk"},
  {"North Korea Standard Time", "Asia/Pyongyang"},
  {"Omsk Standard Time", "Asia/Omsk"},
  {"Pacific SA Standard Time", "America/Santiago"},
  {"Pacific Standard Time", "America/Los_Angeles"},
  {"Pacific Standard Time (Mexico)", "America/Tijuana"},
  {"Pakistan Standard Time", "Asia/Karachi"},
  {"Paraguay Standard Time", "America/Asuncion"},
  {"Qyzylorda Standard Time", "Asia/Qyzylorda"},
  {"Romance Standard Time", "Europe/Paris"},
  {"Russia Time Zone 10", "Asia/Srednekolymsk"},
  {"Russia Time Zone 11", "Asia/Kamchatka"},
  {"Russia Time Zone 3", "Europe/Samara"},
  {"Russian Standard Time", "Europe/Moscow"},
  {"SA Eastern Standard Time", "America/Cayenne"},
  {"SA Pacific Standard Time", "America/Bogota"},
  {"SA Western Standard Time", "America/La_Paz"},
  {"SE Asia Standard Time", "Asia/Bangkok"},
  {"Saint Pierre Standard Time", "America/Miquelon"},
  {"Sakhalin Standard Time", "Asia/Sakhalin"},
  {"Samoa Standard Time", "Pacific/Apia"},
  {"Sao Tome Standard Time", "Africa/Sao_Tome"},
  {"Saratov Standard Time", "Europe/Saratov"},
  {"Singapore Standard Time", "Asia/Singapore"},
  {"South Africa Standard Time", "Africa/Johannesburg"},
  {"South Sudan Standard Time", "Africa/Juba"},
  {"Sri Lanka Standard Time", "Asia/Colombo"},
  {"Sudan Standard Time", "Africa/Khartoum"},
  {"Syria Standard Time", "Asia/Damascus"},
  {"Taipei Standard Time", "Asia/Taipei"},
  {"Tasmania Standard Time", "Australia/Hobart"},
  {"Tocantins Standard Time", "America/Araguaina"},
  {"Tokyo Standard Time", "Asia/Tokyo"},
  {"Tomsk Standard Time", "Asia/Tomsk"},
  {"Tonga Standard Time", "Pacific/Tongatapu"},
  {"Transbaikal Standard Time", "Asia/Chita"},
  {"Turkey Standard Time", "Europe/Istanbul"},
  {"Turks And Caicos Standard Time", "America/Grand_Turk"},
  {"US Eastern Standard Time", "America/Indianapolis"},
  {"US Mountain Standard Time", "America/Phoenix"},
  {"UTC", "Etc/UTC"},
  {"UTC+12", "Etc/GMT-12"},
  {"UTC+13", "Etc/GMT-13"},
  {"UTC-02", "Etc/GMT+2"},
  {"UTC-08", "Etc/GMT+8"},
  {"UTC-09", "Etc/GMT+9"},
  {"UTC-11", "Etc/GMT+11"},
  {"Ulaanbaatar Standard Time", "Asia/Ulaanbaatar"},
  {"Venezuela Standard Time", "America/Caracas"},
  {"Vladivostok Standard Time", "Asia/Vladivostok"},
  {"Volgograd Standard Time", "Europe/Volgograd"},
  {"W. Australia Standard Time", "Australia/Perth"},
  {"W. Central Africa Standard Time", "Africa/Lagos"},
  {"W. Europe Standard Time", "Europe/Berlin"},
  {"W. Mongolia Standard Time", "Asia/Hovd"},
  {"West Asia Standard Time", "Asia/Tashkent"},
  {"West Bank Standard Time", "Asia/Hebron"},
  {"West Pacific Standard Time", "Pacific/Port_Moresby"},
  {"Yakutsk Standard Time", "Asia/Yakutsk"},
  {"Yukon Standard Time", "America/Whitehorse"}};
char *tz_win[554][2]={{"Asia/Shanghai", "China Standard Time"},
{"Africa/Abidjan", "Greenwich Standard Time"},
{"Africa/Accra", "Greenwich Standard Time"},
{"Africa/Addis_Ababa", "E. Africa Standard Time"},
{"Africa/Algiers", "W. Central Africa Standard Time"},
{"Africa/Asmera", "E. Africa Standard Time"},
{"Africa/Bamako", "Greenwich Standard Time"},
{"Africa/Bangui", "W. Central Africa Standard Time"},
{"Africa/Banjul", "Greenwich Standard Time"},
{"Africa/Bissau", "Greenwich Standard Time"},
{"Africa/Blantyre", "South Africa Standard Time"},
{"Africa/Brazzaville", "W. Central Africa Standard Time"},
{"Africa/Bujumbura", "South Africa Standard Time"},
{"Africa/Cairo", "Egypt Standard Time"},
{"Africa/Casablanca", "Morocco Standard Time"},
{"Africa/Ceuta", "Romance Standard Time"},
{"Africa/Conakry", "Greenwich Standard Time"},
{"Africa/Dakar", "Greenwich Standard Time"},
{"Africa/Dar_es_Salaam", "E. Africa Standard Time"},
{"Africa/Djibouti", "E. Africa Standard Time"},
{"Africa/Douala", "W. Central Africa Standard Time"},
{"Africa/El_Aaiun", "Morocco Standard Time"},
{"Africa/Freetown", "Greenwich Standard Time"},
{"Africa/Gaborone", "South Africa Standard Time"},
{"Africa/Harare", "South Africa Standard Time"},
{"Africa/Johannesburg", "South Africa Standard Time"},
{"Africa/Juba", "South Sudan Standard Time"},
{"Africa/Kampala", "E. Africa Standard Time"},
{"Africa/Khartoum", "Sudan Standard Time"},
{"Africa/Kigali", "South Africa Standard Time"},
{"Africa/Kinshasa", "W. Central Africa Standard Time"},
{"Africa/Lagos", "W. Central Africa Standard Time"},
{"Africa/Libreville", "W. Central Africa Standard Time"},
{"Africa/Lome", "Greenwich Standard Time"},
{"Africa/Luanda", "W. Central Africa Standard Time"},
{"Africa/Lubumbashi", "South Africa Standard Time"},
{"Africa/Lusaka", "South Africa Standard Time"},
{"Africa/Malabo", "W. Central Africa Standard Time"},
{"Africa/Maputo", "South Africa Standard Time"},
{"Africa/Maseru", "South Africa Standard Time"},
{"Africa/Mbabane", "South Africa Standard Time"},
{"Africa/Mogadishu", "E. Africa Standard Time"},
{"Africa/Monrovia", "Greenwich Standard Time"},
{"Africa/Nairobi", "E. Africa Standard Time"},
{"Africa/Ndjamena", "W. Central Africa Standard Time"},
{"Africa/Niamey", "W. Central Africa Standard Time"},
{"Africa/Nouakchott", "Greenwich Standard Time"},
{"Africa/Ouagadougou", "Greenwich Standard Time"},
{"Africa/Porto-Novo", "W. Central Africa Standard Time"},
{"Africa/Sao_Tome", "Sao Tome Standard Time"},
{"Africa/Timbuktu", "Greenwich Standard Time"},
{"Africa/Tripoli", "Libya Standard Time"},
{"Africa/Tunis", "W. Central Africa Standard Time"},
{"Africa/Windhoek", "Namibia Standard Time"},
{"America/Adak", "Aleutian Standard Time"},
{"America/Anchorage", "Alaskan Standard Time"},
{"America/Anguilla", "SA Western Standard Time"},
{"America/Antigua", "SA Western Standard Time"},
{"America/Araguaina", "Tocantins Standard Time"},
{"America/Argentina/La_Rioja", "Argentina Standard Time"},
{"America/Argentina/Rio_Gallegos", "Argentina Standard Time"},
{"America/Argentina/Salta", "Argentina Standard Time"},
{"America/Argentina/San_Juan", "Argentina Standard Time"},
{"America/Argentina/San_Luis", "Argentina Standard Time"},
{"America/Argentina/Tucuman", "Argentina Standard Time"},
{"America/Argentina/Ushuaia", "Argentina Standard Time"},
{"America/Aruba", "SA Western Standard Time"},
{"America/Asuncion", "Paraguay Standard Time"},
{"America/Atka", "Aleutian Standard Time"},
{"America/Bahia", "Bahia Standard Time"},
{"America/Bahia_Banderas", "Central Standard Time (Mexico)"},
{"America/Barbados", "SA Western Standard Time"},
{"America/Belem", "SA Eastern Standard Time"},
{"America/Belize", "Central America Standard Time"},
{"America/Blanc-Sablon", "SA Western Standard Time"},
{"America/Boa_Vista", "SA Western Standard Time"},
{"America/Bogota", "SA Pacific Standard Time"},
{"America/Boise", "Mountain Standard Time"},
{"America/Buenos_Aires", "Argentina Standard Time"},
{"America/Cambridge_Bay", "Mountain Standard Time"},
{"America/Campo_Grande", "Central Brazilian Standard Time"},
{"America/Cancun", "Eastern Standard Time (Mexico)"},
{"America/Caracas", "Venezuela Standard Time"},
{"America/Catamarca", "Argentina Standard Time"},
{"America/Cayenne", "SA Eastern Standard Time"},
{"America/Cayman", "SA Pacific Standard Time"},
{"America/Chicago", "Central Standard Time"},
{"America/Chihuahua", "Mountain Standard Time (Mexico)"},
{"America/Coral_Harbour", "SA Pacific Standard Time"},
{"America/Cordoba", "Argentina Standard Time"},
{"America/Costa_Rica", "Central America Standard Time"},
{"America/Creston", "US Mountain Standard Time"},
{"America/Cuiaba", "Central Brazilian Standard Time"},
{"America/Curacao", "SA Western Standard Time"},
{"America/Danmarkshavn", "Greenwich Standard Time"},
{"America/Dawson", "Yukon Standard Time"},
{"America/Dawson_Creek", "US Mountain Standard Time"},
{"America/Denver", "Mountain Standard Time"},
{"America/Detroit", "Eastern Standard Time"},
{"America/Dominica", "SA Western Standard Time"},
{"America/Edmonton", "Mountain Standard Time"},
{"America/Eirunepe", "SA Pacific Standard Time"},
{"America/El_Salvador", "Central America Standard Time"},
{"America/Ensenada", "Pacific Standard Time (Mexico)"},
{"America/Fort_Nelson", "US Mountain Standard Time"},
{"America/Fortaleza", "SA Eastern Standard Time"},
{"America/Glace_Bay", "Atlantic Standard Time"},
{"America/Godthab", "Greenland Standard Time"},
{"America/Goose_Bay", "Atlantic Standard Time"},
{"America/Grand_Turk", "Turks And Caicos Standard Time"},
{"America/Grenada", "SA Western Standard Time"},
{"America/Guadeloupe", "SA Western Standard Time"},
{"America/Guatemala", "Central America Standard Time"},
{"America/Guayaquil", "SA Pacific Standard Time"},
{"America/Guyana", "SA Western Standard Time"},
{"America/Halifax", "Atlantic Standard Time"},
{"America/Havana", "Cuba Standard Time"},
{"America/Hermosillo", "US Mountain Standard Time"},
{"America/Indiana/Knox", "Central Standard Time"},
{"America/Indiana/Marengo", "US Eastern Standard Time"},
{"America/Indiana/Petersburg", "Eastern Standard Time"},
{"America/Indiana/Tell_City", "Central Standard Time"},
{"America/Indiana/Vevay", "US Eastern Standard Time"},
{"America/Indiana/Vincennes", "Eastern Standard Time"},
{"America/Indiana/Winamac", "Eastern Standard Time"},
{"America/Indianapolis", "US Eastern Standard Time"},
{"America/Inuvik", "Mountain Standard Time"},
{"America/Iqaluit", "Eastern Standard Time"},
{"America/Jamaica", "SA Pacific Standard Time"},
{"America/Jujuy", "Argentina Standard Time"},
{"America/Juneau", "Alaskan Standard Time"},
{"America/Kentucky/Monticello", "Eastern Standard Time"},
{"America/Knox_IN", "Central Standard Time"},
{"America/Kralendijk", "SA Western Standard Time"},
{"America/La_Paz", "SA Western Standard Time"},
{"America/Lima", "SA Pacific Standard Time"},
{"America/Los_Angeles", "Pacific Standard Time"},
{"America/Louisville", "Eastern Standard Time"},
{"America/Lower_Princes", "SA Western Standard Time"},
{"America/Maceio", "SA Eastern Standard Time"},
{"America/Managua", "Central America Standard Time"},
{"America/Manaus", "SA Western Standard Time"},
{"America/Marigot", "SA Western Standard Time"},
{"America/Martinique", "SA Western Standard Time"},
{"America/Matamoros", "Central Standard Time"},
{"America/Mazatlan", "Mountain Standard Time (Mexico)"},
{"America/Mendoza", "Argentina Standard Time"},
{"America/Menominee", "Central Standard Time"},
{"America/Merida", "Central Standard Time (Mexico)"},
{"America/Metlakatla", "Alaskan Standard Time"},
{"America/Mexico_City", "Central Standard Time (Mexico)"},
{"America/Miquelon", "Saint Pierre Standard Time"},
{"America/Moncton", "Atlantic Standard Time"},
{"America/Monterrey", "Central Standard Time (Mexico)"},
{"America/Montevideo", "Montevideo Standard Time"},
{"America/Montreal", "Eastern Standard Time"},
{"America/Montserrat", "SA Western Standard Time"},
{"America/Nassau", "Eastern Standard Time"},
{"America/New_York", "Eastern Standard Time"},
{"America/Nipigon", "Eastern Standard Time"},
{"America/Nome", "Alaskan Standard Time"},
{"America/Noronha", "UTC-02"},
{"America/North_Dakota/Beulah", "Central Standard Time"},
{"America/North_Dakota/Center", "Central Standard Time"},
{"America/North_Dakota/New_Salem", "Central Standard Time"},
{"America/Ojinaga", "Mountain Standard Time"},
{"America/Panama", "SA Pacific Standard Time"},
{"America/Pangnirtung", "Eastern Standard Time"},
{"America/Paramaribo", "SA Eastern Standard Time"},
{"America/Phoenix", "US Mountain Standard Time"},
{"America/Port-au-Prince", "Haiti Standard Time"},
{"America/Port_of_Spain", "SA Western Standard Time"},
{"America/Porto_Acre", "SA Pacific Standard Time"},
{"America/Porto_Velho", "SA Western Standard Time"},
{"America/Puerto_Rico", "SA Western Standard Time"},
{"America/Punta_Arenas", "Magallanes Standard Time"},
{"America/Rainy_River", "Central Standard Time"},
{"America/Rankin_Inlet", "Central Standard Time"},
{"America/Recife", "SA Eastern Standard Time"},
{"America/Regina", "Canada Central Standard Time"},
{"America/Resolute", "Central Standard Time"},
{"America/Rio_Branco", "SA Pacific Standard Time"},
{"America/Santa_Isabel", "Pacific Standard Time (Mexico)"},
{"America/Santarem", "SA Eastern Standard Time"},
{"America/Santiago", "Pacific SA Standard Time"},
{"America/Santo_Domingo", "SA Western Standard Time"},
{"America/Sao_Paulo", "E. South America Standard Time"},
{"America/Scoresbysund", "Azores Standard Time"},
{"America/Shiprock", "Mountain Standard Time"},
{"America/Sitka", "Alaskan Standard Time"},
{"America/St_Barthelemy", "SA Western Standard Time"},
{"America/St_Johns", "Newfoundland Standard Time"},
{"America/St_Kitts", "SA Western Standard Time"},
{"America/St_Lucia", "SA Western Standard Time"},
{"America/St_Thomas", "SA Western Standard Time"},
{"America/St_Vincent", "SA Western Standard Time"},
{"America/Swift_Current", "Canada Central Standard Time"},
{"America/Tegucigalpa", "Central America Standard Time"},
{"America/Thule", "Atlantic Standard Time"},
{"America/Thunder_Bay", "Eastern Standard Time"},
{"America/Tijuana", "Pacific Standard Time (Mexico)"},
{"America/Toronto", "Eastern Standard Time"},
{"America/Tortola", "SA Western Standard Time"},
{"America/Vancouver", "Pacific Standard Time"},
{"America/Virgin", "SA Western Standard Time"},
{"America/Whitehorse", "Yukon Standard Time"},
{"America/Winnipeg", "Central Standard Time"},
{"America/Yakutat", "Alaskan Standard Time"},
{"America/Yellowknife", "Mountain Standard Time"},
{"Antarctica/Casey", "Central Pacific Standard Time"},
{"Antarctica/Davis", "SE Asia Standard Time"},
{"Antarctica/DumontDUrville", "West Pacific Standard Time"},
{"Antarctica/Macquarie", "Tasmania Standard Time"},
{"Antarctica/Mawson", "West Asia Standard Time"},
{"Antarctica/McMurdo", "New Zealand Standard Time"},
{"Antarctica/Palmer", "SA Eastern Standard Time"},
{"Antarctica/Rothera", "SA Eastern Standard Time"},
{"Antarctica/South_Pole", "New Zealand Standard Time"},
{"Antarctica/Syowa", "E. Africa Standard Time"},
{"Antarctica/Vostok", "Central Asia Standard Time"},
{"Arctic/Longyearbyen", "W. Europe Standard Time"},
{"Asia/Aden", "Arab Standard Time"},
{"Asia/Almaty", "Central Asia Standard Time"},
{"Asia/Amman", "Jordan Standard Time"},
{"Asia/Anadyr", "Russia Time Zone 11"},
{"Asia/Aqtau", "West Asia Standard Time"},
{"Asia/Aqtobe", "West Asia Standard Time"},
{"Asia/Ashgabat", "West Asia Standard Time"},
{"Asia/Ashkhabad", "West Asia Standard Time"},
{"Asia/Atyrau", "West Asia Standard Time"},
{"Asia/Baghdad", "Arabic Standard Time"},
{"Asia/Bahrain", "Arab Standard Time"},
{"Asia/Baku", "Azerbaijan Standard Time"},
{"Asia/Bangkok", "SE Asia Standard Time"},
{"Asia/Barnaul", "Altai Standard Time"},
{"Asia/Beirut", "Middle East Standard Time"},
{"Asia/Bishkek", "Central Asia Standard Time"},
{"Asia/Brunei", "Singapore Standard Time"},
{"Asia/Calcutta", "India Standard Time"},
{"Asia/Chita", "Transbaikal Standard Time"},
{"Asia/Choibalsan", "Ulaanbaatar Standard Time"},
{"Asia/Chongqing", "China Standard Time"},
{"Asia/Chungking", "China Standard Time"},
{"Asia/Colombo", "Sri Lanka Standard Time"},
{"Asia/Dacca", "Bangladesh Standard Time"},
{"Asia/Damascus", "Syria Standard Time"},
{"Asia/Dhaka", "Bangladesh Standard Time"},
{"Asia/Dili", "Tokyo Standard Time"},
{"Asia/Dubai", "Arabian Standard Time"},
{"Asia/Dushanbe", "West Asia Standard Time"},
{"Asia/Famagusta", "GTB Standard Time"},
{"Asia/Gaza", "West Bank Standard Time"},
{"Asia/Harbin", "China Standard Time"},
{"Asia/Hebron", "West Bank Standard Time"},
{"Asia/Hong_Kong", "China Standard Time"},
{"Asia/Hovd", "W. Mongolia Standard Time"},
{"Asia/Irkutsk", "North Asia East Standard Time"},
{"Asia/Jakarta", "SE Asia Standard Time"},
{"Asia/Jayapura", "Tokyo Standard Time"},
{"Asia/Jerusalem", "Israel Standard Time"},
{"Asia/Kabul", "Afghanistan Standard Time"},
{"Asia/Kamchatka", "Russia Time Zone 11"},
{"Asia/Karachi", "Pakistan Standard Time"},
{"Asia/Kashgar", "Central Asia Standard Time"},
{"Asia/Katmandu", "Nepal Standard Time"},
{"Asia/Khandyga", "Yakutsk Standard Time"},
{"Asia/Krasnoyarsk", "North Asia Standard Time"},
{"Asia/Kuala_Lumpur", "Singapore Standard Time"},
{"Asia/Kuching", "Singapore Standard Time"},
{"Asia/Kuwait", "Arab Standard Time"},
{"Asia/Macao", "China Standard Time"},
{"Asia/Macau", "China Standard Time"},
{"Asia/Magadan", "Magadan Standard Time"},
{"Asia/Makassar", "Singapore Standard Time"},
{"Asia/Manila", "Singapore Standard Time"},
{"Asia/Muscat", "Arabian Standard Time"},
{"Asia/Nicosia", "GTB Standard Time"},
{"Asia/Novokuznetsk", "North Asia Standard Time"},
{"Asia/Novosibirsk", "N. Central Asia Standard Time"},
{"Asia/Omsk", "Omsk Standard Time"},
{"Asia/Oral", "West Asia Standard Time"},
{"Asia/Phnom_Penh", "SE Asia Standard Time"},
{"Asia/Pontianak", "SE Asia Standard Time"},
{"Asia/Pyongyang", "North Korea Standard Time"},
{"Asia/Qatar", "Arab Standard Time"},
{"Asia/Qostanay", "Central Asia Standard Time"},
{"Asia/Qyzylorda", "Qyzylorda Standard Time"},
{"Asia/Rangoon", "Myanmar Standard Time"},
{"Asia/Riyadh", "Arab Standard Time"},
{"Asia/Saigon", "SE Asia Standard Time"},
{"Asia/Sakhalin", "Sakhalin Standard Time"},
{"Asia/Samarkand", "West Asia Standard Time"},
{"Asia/Seoul", "Korea Standard Time"},
{"Asia/Singapore", "Singapore Standard Time"},
{"Asia/Srednekolymsk", "Russia Time Zone 10"},
{"Asia/Taipei", "Taipei Standard Time"},
{"Asia/Tashkent", "West Asia Standard Time"},
{"Asia/Tbilisi", "Georgian Standard Time"},
{"Asia/Tehran", "Iran Standard Time"},
{"Asia/Tel_Aviv", "Israel Standard Time"},
{"Asia/Thimbu", "Bangladesh Standard Time"},
{"Asia/Thimphu", "Bangladesh Standard Time"},
{"Asia/Tokyo", "Tokyo Standard Time"},
{"Asia/Tomsk", "Tomsk Standard Time"},
{"Asia/Ujung_Pandang", "Singapore Standard Time"},
{"Asia/Ulaanbaatar", "Ulaanbaatar Standard Time"},
{"Asia/Ulan_Bator", "Ulaanbaatar Standard Time"},
{"Asia/Urumqi", "Central Asia Standard Time"},
{"Asia/Ust-Nera", "Vladivostok Standard Time"},
{"Asia/Vientiane", "SE Asia Standard Time"},
{"Asia/Vladivostok", "Vladivostok Standard Time"},
{"Asia/Yakutsk", "Yakutsk Standard Time"},
{"Asia/Yekaterinburg", "Ekaterinburg Standard Time"},
{"Asia/Yerevan", "Caucasus Standard Time"},
{"Atlantic/Azores", "Azores Standard Time"},
{"Atlantic/Bermuda", "Atlantic Standard Time"},
{"Atlantic/Canary", "GMT Standard Time"},
{"Atlantic/Cape_Verde", "Cape Verde Standard Time"},
{"Atlantic/Faeroe", "GMT Standard Time"},
{"Atlantic/Jan_Mayen", "W. Europe Standard Time"},
{"Atlantic/Madeira", "GMT Standard Time"},
{"Atlantic/Reykjavik", "Greenwich Standard Time"},
{"Atlantic/South_Georgia", "UTC-02"},
{"Atlantic/St_Helena", "Greenwich Standard Time"},
{"Atlantic/Stanley", "SA Eastern Standard Time"},
{"Australia/ACT", "AUS Eastern Standard Time"},
{"Australia/Adelaide", "Cen. Australia Standard Time"},
{"Australia/Brisbane", "E. Australia Standard Time"},
{"Australia/Broken_Hill", "Cen. Australia Standard Time"},
{"Australia/Canberra", "AUS Eastern Standard Time"},
{"Australia/Currie", "Tasmania Standard Time"},
{"Australia/Darwin", "AUS Central Standard Time"},
{"Australia/Eucla", "Aus Central W. Standard Time"},
{"Australia/Hobart", "Tasmania Standard Time"},
{"Australia/LHI", "Lord Howe Standard Time"},
{"Australia/Lindeman", "E. Australia Standard Time"},
{"Australia/Lord_Howe", "Lord Howe Standard Time"},
{"Australia/Melbourne", "AUS Eastern Standard Time"},
{"Australia/NSW", "AUS Eastern Standard Time"},
{"Australia/North", "AUS Central Standard Time"},
{"Australia/Perth", "W. Australia Standard Time"},
{"Australia/Queensland", "E. Australia Standard Time"},
{"Australia/South", "Cen. Australia Standard Time"},
{"Australia/Sydney", "AUS Eastern Standard Time"},
{"Australia/Tasmania", "Tasmania Standard Time"},
{"Australia/Victoria", "AUS Eastern Standard Time"},
{"Australia/West", "W. Australia Standard Time"},
{"Australia/Yancowinna", "Cen. Australia Standard Time"},
{"Brazil/Acre", "SA Pacific Standard Time"},
{"Brazil/DeNoronha", "UTC-02"},
{"Brazil/East", "E. South America Standard Time"},
{"Brazil/West", "SA Western Standard Time"},
{"CST6CDT", "Central Standard Time"},
{"Canada/Atlantic", "Atlantic Standard Time"},
{"Canada/Central", "Central Standard Time"},
{"Canada/Eastern", "Eastern Standard Time"},
{"Canada/Mountain", "Mountain Standard Time"},
{"Canada/Newfoundland", "Newfoundland Standard Time"},
{"Canada/Pacific", "Pacific Standard Time"},
{"Canada/Saskatchewan", "Canada Central Standard Time"},
{"Canada/Yukon", "Yukon Standard Time"},
{"Chile/Continental", "Pacific SA Standard Time"},
{"Chile/EasterIsland", "Easter Island Standard Time"},
{"Cuba", "Cuba Standard Time"},
{"EST5EDT", "Eastern Standard Time"},
{"Egypt", "Egypt Standard Time"},
{"Eire", "GMT Standard Time"},
{"Etc/GMT", "UTC"},
{"Etc/GMT+1", "Cape Verde Standard Time"},
{"Etc/GMT+10", "Hawaiian Standard Time"},
{"Etc/GMT+11", "UTC-11"},
{"Etc/GMT+12", "Dateline Standard Time"},
{"Etc/GMT+2", "UTC-02"},
{"Etc/GMT+3", "SA Eastern Standard Time"},
{"Etc/GMT+4", "SA Western Standard Time"},
{"Etc/GMT+5", "SA Pacific Standard Time"},
{"Etc/GMT+6", "Central America Standard Time"},
{"Etc/GMT+7", "US Mountain Standard Time"},
{"Etc/GMT+8", "UTC-08"},
{"Etc/GMT+9", "UTC-09"},
{"Etc/GMT-1", "W. Central Africa Standard Time"},
{"Etc/GMT-10", "West Pacific Standard Time"},
{"Etc/GMT-11", "Central Pacific Standard Time"},
{"Etc/GMT-12", "UTC+12"},
{"Etc/GMT-13", "UTC+13"},
{"Etc/GMT-14", "Line Islands Standard Time"},
{"Etc/GMT-2", "South Africa Standard Time"},
{"Etc/GMT-3", "E. Africa Standard Time"},
{"Etc/GMT-4", "Arabian Standard Time"},
{"Etc/GMT-5", "West Asia Standard Time"},
{"Etc/GMT-6", "Central Asia Standard Time"},
{"Etc/GMT-7", "SE Asia Standard Time"},
{"Etc/GMT-8", "Singapore Standard Time"},
{"Etc/GMT-9", "Tokyo Standard Time"},
{"Etc/UCT", "UTC"},
{"Etc/UTC", "UTC"},
{"Europe/Amsterdam", "W. Europe Standard Time"},
{"Europe/Andorra", "W. Europe Standard Time"},
{"Europe/Astrakhan", "Astrakhan Standard Time"},
{"Europe/Athens", "GTB Standard Time"},
{"Europe/Belfast", "GMT Standard Time"},
{"Europe/Belgrade", "Central Europe Standard Time"},
{"Europe/Berlin", "W. Europe Standard Time"},
{"Europe/Bratislava", "Central Europe Standard Time"},
{"Europe/Brussels", "Romance Standard Time"},
{"Europe/Bucharest", "GTB Standard Time"},
{"Europe/Budapest", "Central Europe Standard Time"},
{"Europe/Busingen", "W. Europe Standard Time"},
{"Europe/Chisinau", "E. Europe Standard Time"},
{"Europe/Copenhagen", "Romance Standard Time"},
{"Europe/Dublin", "GMT Standard Time"},
{"Europe/Gibraltar", "W. Europe Standard Time"},
{"Europe/Guernsey", "GMT Standard Time"},
{"Europe/Helsinki", "FLE Standard Time"},
{"Europe/Isle_of_Man", "GMT Standard Time"},
{"Europe/Istanbul", "Turkey Standard Time"},
{"Europe/Jersey", "GMT Standard Time"},
{"Europe/Kaliningrad", "Kaliningrad Standard Time"},
{"Europe/Kiev", "FLE Standard Time"},
{"Europe/Kirov", "Russian Standard Time"},
{"Europe/Lisbon", "GMT Standard Time"},
{"Europe/Ljubljana", "Central Europe Standard Time"},
{"Europe/London", "GMT Standard Time"},
{"Europe/Luxembourg", "W. Europe Standard Time"},
{"Europe/Madrid", "Romance Standard Time"},
{"Europe/Malta", "W. Europe Standard Time"},
{"Europe/Mariehamn", "FLE Standard Time"},
{"Europe/Minsk", "Belarus Standard Time"},
{"Europe/Monaco", "W. Europe Standard Time"},
{"Europe/Moscow", "Russian Standard Time"},
{"Europe/Oslo", "W. Europe Standard Time"},
{"Europe/Paris", "Romance Standard Time"},
{"Europe/Podgorica", "Central Europe Standard Time"},
{"Europe/Prague", "Central Europe Standard Time"},
{"Europe/Riga", "FLE Standard Time"},
{"Europe/Rome", "W. Europe Standard Time"},
{"Europe/Samara", "Russia Time Zone 3"},
{"Europe/San_Marino", "W. Europe Standard Time"},
{"Europe/Sarajevo", "Central European Standard Time"},
{"Europe/Saratov", "Saratov Standard Time"},
{"Europe/Simferopol", "Russian Standard Time"},
{"Europe/Skopje", "Central European Standard Time"},
{"Europe/Sofia", "FLE Standard Time"},
{"Europe/Stockholm", "W. Europe Standard Time"},
{"Europe/Tallinn", "FLE Standard Time"},
{"Europe/Tirane", "Central Europe Standard Time"},
{"Europe/Tiraspol", "E. Europe Standard Time"},
{"Europe/Ulyanovsk", "Astrakhan Standard Time"},
{"Europe/Uzhgorod", "FLE Standard Time"},
{"Europe/Vaduz", "W. Europe Standard Time"},
{"Europe/Vatican", "W. Europe Standard Time"},
{"Europe/Vienna", "W. Europe Standard Time"},
{"Europe/Vilnius", "FLE Standard Time"},
{"Europe/Volgograd", "Volgograd Standard Time"},
{"Europe/Warsaw", "Central European Standard Time"},
{"Europe/Zagreb", "Central European Standard Time"},
{"Europe/Zaporozhye", "FLE Standard Time"},
{"Europe/Zurich", "W. Europe Standard Time"},
{"GB", "GMT Standard Time"},
{"GB-Eire", "GMT Standard Time"},
{"GMT+0", "UTC"},
{"GMT-0", "UTC"},
{"GMT0", "UTC"},
{"Greenwich", "UTC"},
{"Hongkong", "China Standard Time"},
{"Iceland", "Greenwich Standard Time"},
{"Indian/Antananarivo", "E. Africa Standard Time"},
{"Indian/Chagos", "Central Asia Standard Time"},
{"Indian/Christmas", "SE Asia Standard Time"},
{"Indian/Cocos", "Myanmar Standard Time"},
{"Indian/Comoro", "E. Africa Standard Time"},
{"Indian/Kerguelen", "West Asia Standard Time"},
{"Indian/Mahe", "Mauritius Standard Time"},
{"Indian/Maldives", "West Asia Standard Time"},
{"Indian/Mauritius", "Mauritius Standard Time"},
{"Indian/Mayotte", "E. Africa Standard Time"},
{"Indian/Reunion", "Mauritius Standard Time"},
{"Iran", "Iran Standard Time"},
{"Israel", "Israel Standard Time"},
{"Jamaica", "SA Pacific Standard Time"},
{"Japan", "Tokyo Standard Time"},
{"Kwajalein", "UTC+12"},
{"Libya", "Libya Standard Time"},
{"MST7MDT", "Mountain Standard Time"},
{"Mexico/BajaNorte", "Pacific Standard Time (Mexico)"},
{"Mexico/BajaSur", "Mountain Standard Time (Mexico)"},
{"Mexico/General", "Central Standard Time (Mexico)"},
{"NZ", "New Zealand Standard Time"},
{"NZ-CHAT", "Chatham Islands Standard Time"},
{"Navajo", "Mountain Standard Time"},
{"PRC", "China Standard Time"},
{"PST8PDT", "Pacific Standard Time"},
{"Pacific/Apia", "Samoa Standard Time"},
{"Pacific/Auckland", "New Zealand Standard Time"},
{"Pacific/Bougainville", "Bougainville Standard Time"},
{"Pacific/Chatham", "Chatham Islands Standard Time"},
{"Pacific/Easter", "Easter Island Standard Time"},
{"Pacific/Efate", "Central Pacific Standard Time"},
{"Pacific/Enderbury", "UTC+13"},
{"Pacific/Fakaofo", "UTC+13"},
{"Pacific/Fiji", "Fiji Standard Time"},
{"Pacific/Funafuti", "UTC+12"},
{"Pacific/Galapagos", "Central America Standard Time"},
{"Pacific/Gambier", "UTC-09"},
{"Pacific/Guadalcanal", "Central Pacific Standard Time"},
{"Pacific/Guam", "West Pacific Standard Time"},
{"Pacific/Honolulu", "Hawaiian Standard Time"},
{"Pacific/Johnston", "Hawaiian Standard Time"},
{"Pacific/Kiritimati", "Line Islands Standard Time"},
{"Pacific/Kosrae", "Central Pacific Standard Time"},
{"Pacific/Kwajalein", "UTC+12"},
{"Pacific/Majuro", "UTC+12"},
{"Pacific/Marquesas", "Marquesas Standard Time"},
{"Pacific/Midway", "UTC-11"},
{"Pacific/Nauru", "UTC+12"},
{"Pacific/Niue", "UTC-11"},
{"Pacific/Norfolk", "Norfolk Standard Time"},
{"Pacific/Noumea", "Central Pacific Standard Time"},
{"Pacific/Pago_Pago", "UTC-11"},
{"Pacific/Palau", "Tokyo Standard Time"},
{"Pacific/Pitcairn", "UTC-08"},
{"Pacific/Ponape", "Central Pacific Standard Time"},
{"Pacific/Port_Moresby", "West Pacific Standard Time"},
{"Pacific/Rarotonga", "Hawaiian Standard Time"},
{"Pacific/Saipan", "West Pacific Standard Time"},
{"Pacific/Samoa", "UTC-11"},
{"Pacific/Tahiti", "Hawaiian Standard Time"},
{"Pacific/Tarawa", "UTC+12"},
{"Pacific/Tongatapu", "Tonga Standard Time"},
{"Pacific/Truk", "West Pacific Standard Time"},
{"Pacific/Wake", "UTC+12"},
{"Pacific/Wallis", "UTC+12"},
{"Poland", "Central European Standard Time"},
{"Portugal", "GMT Standard Time"},
{"ROC", "Taipei Standard Time"},
{"ROK", "Korea Standard Time"},
{"Singapore", "Singapore Standard Time"},
{"Turkey", "Turkey Standard Time"},
{"UCT", "UTC"},
{"US/Alaska", "Alaskan Standard Time"},
{"US/Aleutian", "Aleutian Standard Time"},
{"US/Arizona", "US Mountain Standard Time"},
{"US/Central", "Central Standard Time"},
{"US/Eastern", "Eastern Standard Time"},
{"US/Hawaii", "Hawaiian Standard Time"},
{"US/Indiana-Starke", "Central Standard Time"},
{"US/Michigan", "Eastern Standard Time"},
{"US/Mountain", "Mountain Standard Time"},
{"US/Pacific", "Pacific Standard Time"},
{"US/Samoa", "UTC-11"},
{"UTC", "UTC"},
{"Universal", "UTC"},
{"W-SU", "Russian Standard Time"},
{"Zulu", "UTC"}};
#elif defined(_TD_DARWIN_64)
#include <errno.h>
#include <libproc.h>
#else
#include <argp.h>
#include <linux/sysctl.h>
#include <sys/file.h>
#include <sys/resource.h>
#include <sys/statvfs.h>
#include <sys/syscall.h>
#include <sys/utsname.h>
#include <unistd.h>
#endif

void taosSetSystemTimezone(const char *inTimezoneStr, char *outTimezoneStr, int8_t *outDaylight, enum TdTimezone *tsTimezone) {
  if (inTimezoneStr == NULL || inTimezoneStr[0] == 0) return;

  char *buf = taosMemoryMalloc(strlen(inTimezoneStr) + 1);
  buf[strlen(inTimezoneStr)] = 0;
  for (int32_t i = 0; i < strlen(inTimezoneStr); i++) {
      if(inTimezoneStr[i]==' ' || inTimezoneStr[i]=='(') {
          buf[i] = 0;
          break;
      }
      buf[i] = inTimezoneStr[i];
  }

#ifdef WINDOWS
  char winStr[TD_LOCALE_LEN * 2];
  memset(winStr, 0, sizeof(winStr));
  for (size_t i = 0; i < 554; i++) {
    if (strcmp(tz_win[i][0],buf) == 0) {
      char keyPath[100];
      char keyValue[100];
      DWORD keyValueSize = sizeof(keyValue);
      sprintf(keyPath, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\%s",tz_win[i][1]);
      RegGetValue(HKEY_LOCAL_MACHINE, keyPath, "Display", RRF_RT_ANY, NULL, (PVOID)&keyValue, &keyValueSize);
      if (keyValueSize > 0) {
        keyValue[4] = (keyValue[4] == '+' ? '-' : '+');
        keyValue[10] = 0;
        sprintf(winStr, "TZ=%s:00", &(keyValue[1]));
        *tsTimezone = taosStr2Int32(&keyValue[4], NULL, 10);
      }
      break;
    }
  }
  if (winStr[0] == 0) {
    char *p = strchr(inTimezoneStr, '+');
    if (p == NULL) p = strchr(inTimezoneStr, '-');
    if (p != NULL) {
      char *pp = strchr(inTimezoneStr, '(');
      char *ppp = strchr(inTimezoneStr, ',');
      int indexStr;
      if (pp == NULL || ppp == NULL) {
        indexStr = sprintf(winStr, "TZ=UTC");
      } else {
        memcpy(winStr, "TZ=", 3);
        pp++;
        memcpy(&winStr[3], pp, ppp - pp);
        indexStr = ppp - pp + 3;
      }
      sprintf(&winStr[indexStr], "%c%c%c:%c%c:00", (p[0] == '+'? '-' : '+'), p[1], p[2], p[3], p[4]);
      *tsTimezone = taosStr2Int32(p, NULL, 10);
    } else {
      *tsTimezone = 0;
    }
  }
  _putenv(winStr);
  _tzset();
  strcpy(outTimezoneStr, inTimezoneStr);
  *outDaylight = 0;

#elif defined(_TD_DARWIN_64)

  setenv("TZ", buf, 1);
  tzset();
  int32_t tz = (int32_t)((-timezone * MILLISECOND_PER_SECOND) / MILLISECOND_PER_HOUR);
  *tsTimezone = tz;
  tz += daylight;

  sprintf(outTimezoneStr, "%s (%s, %s%02d00)", buf, tzname[daylight], tz >= 0 ? "+" : "-", abs(tz));
  *outDaylight = daylight;

#else
  setenv("TZ", buf, 1);
  tzset();
  int32_t tz = (int32_t)((-timezone * MILLISECOND_PER_SECOND) / MILLISECOND_PER_HOUR);
  *tsTimezone = tz;
  tz += daylight;
  sprintf(outTimezoneStr, "%s (%s, %s%02d00)", buf, tzname[daylight], tz >= 0 ? "+" : "-", abs(tz));
  *outDaylight = daylight;

#endif

  taosMemoryFree(buf);
}

void taosGetSystemTimezone(char *outTimezoneStr, enum TdTimezone *tsTimezone) {
#ifdef WINDOWS 
  char value[100];
  char keyPath[100];
  DWORD bufferSize = sizeof(value);
  RegGetValue(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation", "TimeZoneKeyName", RRF_RT_ANY, NULL, (PVOID)&value, &bufferSize);
  strcpy(outTimezoneStr, "not configured");
  *tsTimezone = 0;
  if (bufferSize > 0) {
    for (size_t i = 0; i < 139; i++) {
      if (strcmp(win_tz[i][0],value) == 0) {
        strcpy(outTimezoneStr, win_tz[i][1]);
        bufferSize = sizeof(value);
        sprintf(keyPath, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\%s",value);
        RegGetValue(HKEY_LOCAL_MACHINE, keyPath, "Display", RRF_RT_ANY, NULL, (PVOID)&value, &bufferSize);
        if (bufferSize > 0) {
          // value[4] = (value[4] == '+' ? '-' : '+');
          sprintf(outTimezoneStr, "%s (UTC, %c%c%c%c%c)", outTimezoneStr, value[4], value[5], value[6], value[8], value[9]);
          *tsTimezone = taosStr2Int32(&value[4], NULL, 10);
        }
        break;
      }
    }
  }
#elif defined(_TD_DARWIN_64)
  char  buf[4096] = {0};
  char *tz = NULL;
  {
    int n = readlink("/etc/localtime", buf, sizeof(buf));
    if (n < 0) {
      printf("read /etc/localtime error, reason:%s", strerror(errno));
      return;
    }
    buf[n] = '\0';

    char *zi = strstr(buf, "zoneinfo");
    if (!zi) {
      printf("parsing /etc/localtime failed");
      return;
    }
    tz = zi + strlen("zoneinfo") + 1;

    //for (int i = n - 1; i >= 0; --i) {
    //  if (buf[i] == '/') {
    //    if (tz) {
    //      tz = buf + i + 1;
    //      break;
    //    }
    //    tz = buf + i + 1;
    //  }
    //}
    //if (!tz || 0 == strchr(tz, '/')) {
    //  printf("parsing /etc/localtime failed");
    //  return;
    //}

    setenv("TZ", tz, 1);
    tzset();
  }

  /*
   * NOTE: do not remove it.
   * Enforce set the correct daylight saving time(DST) flag according
   * to current time
   */
  time_t    tx1 = taosGetTimestampSec();
  struct tm tm1;
  taosLocalTime(&tx1, &tm1);
  daylight = tm1.tm_isdst;

  /*
   * format example:
   *
   * Asia/Shanghai   (CST, +0800)
   * Europe/London   (BST, +0100)
   */
  snprintf(outTimezoneStr, TD_TIMEZONE_LEN, "%s (%s, %+03ld00)", tz, tm1.tm_isdst ? tzname[daylight] : tzname[0],
           -timezone / 3600);
#else

  char  buf[4096] = {0};
  char *tz = NULL;
  {
    int n = readlink("/etc/localtime", buf, sizeof(buf));
    if (n < 0) {
      printf("read /etc/localtime error, reason:%s", strerror(errno));

      if (taosCheckExistFile("/etc/timezone")) {
        /*
        * NOTE: do not remove it.
        * Enforce set the correct daylight saving time(DST) flag according
        * to current time
        */
        time_t    tx1 = taosGetTimestampSec();
        struct tm tm1;
        taosLocalTime(&tx1, &tm1);
        /* load time zone string from /etc/timezone */
        // FILE *f = fopen("/etc/timezone", "r");
        errno = 0;
        TdFilePtr pFile = taosOpenFile("/etc/timezone", TD_FILE_READ);
        char  buf[68] = {0};
        if (pFile != NULL) {
          int len = taosReadFile(pFile, buf, 64);
          if (len < 64 && taosGetErrorFile(pFile)) {
            taosCloseFile(&pFile);
            printf("read /etc/timezone error, reason:%s", strerror(errno));
            return;
          }

          taosCloseFile(&pFile);

          buf[sizeof(buf) - 1] = 0;
          char *lineEnd = strstr(buf, "\n");
          if (lineEnd != NULL) {
            *lineEnd = 0;
          }

          // for CentOS system, /etc/timezone does not exist. Ignore the TZ environment variables
          if (strlen(buf) > 0) {
            setenv("TZ", buf, 1);
          }
        }
        // get and set default timezone
        tzset();
        /*
        * get CURRENT time zone.
        * system current time zone is affected by daylight saving time(DST)
        *
        * e.g., the local time zone of London in DST is GMT+01:00,
        * otherwise is GMT+00:00
        */
        int32_t tz = (-timezone * MILLISECOND_PER_SECOND) / MILLISECOND_PER_HOUR;
        *tsTimezone = tz;
        tz += daylight;

        /*
        * format example:
        *
        * Asia/Shanghai   (CST, +0800)
        * Europe/London   (BST, +0100)
        */
        snprintf(outTimezoneStr, TD_TIMEZONE_LEN, "%s (%s, %s%02d00)", buf, tzname[daylight], tz >= 0 ? "+" : "-", abs(tz));
      } else {
        printf("There is not /etc/timezone.\n");
      }
      return;
    }
    buf[n] = '\0';

    char *zi = strstr(buf, "zoneinfo");
    if (!zi) {
      printf("parsing /etc/localtime failed");
      return;
    }
    tz = zi + strlen("zoneinfo") + 1;

    //for (int i = n - 1; i >= 0; --i) {
    //  if (buf[i] == '/') {
    //    if (tz) {
    //      tz = buf + i + 1;
    //      break;
    //    }
    //    tz = buf + i + 1;
    //  }
    //}
    //if (!tz || 0 == strchr(tz, '/')) {
    //  printf("parsing /etc/localtime failed");
    //  return;
    //}

    setenv("TZ", tz, 1);
    tzset();
  }

  /*
  * NOTE: do not remove it.
  * Enforce set the correct daylight saving time(DST) flag according
  * to current time
  */
  time_t    tx1 = taosGetTimestampSec();
  struct tm tm1;
  taosLocalTime(&tx1, &tm1);

  /*
  * format example:
  *
  * Asia/Shanghai   (CST, +0800)
  * Europe/London   (BST, +0100)
  */
  snprintf(outTimezoneStr, TD_TIMEZONE_LEN, "%s (%s, %+03ld00)", tz, tm1.tm_isdst ? tzname[daylight] : tzname[0],
          -timezone / 3600);
#endif
}