From: Björn Schäpers <bjo...@hazardy.de>

On Windows there is no API to get the current time zone as IANA name,
instead Windows has its own zones. But there exists a mapping provided
by the Unicode Consortium. This patch adds a script to convert the XML
file with the mapping to a lookup table and adds a Windows code path to
use that mapping.

libstdc++-v3/Changelog:

        Implement std::chrono::current_zone() for Windows

        * scripts/gen_windows_zones_map.py: New file, generates
        windows_zones-map.h.
        * src/c++20/windows_zones-map.h: New file, contains the look up
        table.
        * src/c++20/tzdb.cc (tzdb::current_zone): Add Windows code path.

Signed-off-by: Björn Schäpers <bjo...@hazardy.de>
---
 libstdc++-v3/scripts/gen_windows_zones_map.py | 127 ++++++
 libstdc++-v3/src/c++20/tzdb.cc                | 103 ++++-
 libstdc++-v3/src/c++20/windows_zones-map.h    | 407 ++++++++++++++++++
 3 files changed, 635 insertions(+), 2 deletions(-)
 create mode 100644 libstdc++-v3/scripts/gen_windows_zones_map.py
 create mode 100644 libstdc++-v3/src/c++20/windows_zones-map.h

diff --git a/libstdc++-v3/scripts/gen_windows_zones_map.py 
b/libstdc++-v3/scripts/gen_windows_zones_map.py
new file mode 100644
index 00000000000..9ac559209cc
--- /dev/null
+++ b/libstdc++-v3/scripts/gen_windows_zones_map.py
@@ -0,0 +1,127 @@
+#!/usr/bin/env python3
+#
+# Script to generate the map for libstdc++ std::chrono::current_zone under 
Windows.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 3, or (at your option) any later
+# version.
+#
+# GCC 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.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+# To update the Libstdc++ static data in src/c++20/windows_zones-map.h 
download the latest:
+# 
https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml
+# Then run this script and save the output to
+# src/c++20/windows_zones-map.h
+
+import os
+import sys
+import xml.etree.ElementTree as et
+
+if len(sys.argv) != 2:
+    print("Usage: %s <windows zones xml>" % sys.argv[0], file=sys.stderr)
+    sys.exit(1)
+
+self = os.path.basename(__file__)
+print("// Generated by scripts/{}, do not edit.".format(self))
+print("""
+// Copyright The GNU Toolchain Authors.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library 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.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/windows_zones-map.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{chrono}
+ */
+""")
+
+print("#ifndef _GLIBCXX_GET_WINDOWS_ZONES_MAP")
+print('# error "This is not a public header, do not include it directly"')
+print("#endif\n")
+
+class WindowsZoneMapEntry:
+    def __init__(self, windows, territory, iana):
+        self.windows = windows
+        self.territory = territory
+        self.iana = iana
+
+    def __lt__(self, other):
+        if self.windows < other.windows:
+            return True
+        if self.windows > other.windows:
+            return False
+        return self.territory < other.territory
+
+windows_zone_map = []
+
+tree = et.parse(sys.argv[1])
+xml_zone_map = tree.getroot().find("windowsZones").find("mapTimezones")
+
+for entry in xml_zone_map.iter("mapZone"):
+    iana = entry.attrib["type"]
+    space = iana.find(" ")
+    if space != -1:
+        iana = iana[0:space]
+    windows_zone_map.append(WindowsZoneMapEntry(entry.attrib["other"], 
entry.attrib["territory"], iana))
+
+# Sort so we can use binary search on the array.
+windows_zone_map.sort();
+
+# Skip territories which have the same IANA zone as 001, so we can reduce the 
data.
+last_windows_zone = ""
+for entry in windows_zone_map[:]:
+    if entry.windows != last_windows_zone:
+        if entry.territory != "001":
+            raise ValueError("Territory \"001\" not the first one, this breaks 
assumptions in tzdb.cc!")
+        last_windows_zone = entry.windows
+        fallback_iana = entry.iana
+    else:
+        if entry.iana == fallback_iana:
+            windows_zone_map.remove(entry)
+
+print("""struct windows_zone_map_entry
+{{
+  wstring_view windows_name;
+  wstring_view territory;
+  string_view iana_name;
+}};
+
+static constexpr array<windows_zone_map_entry, {}> windows_zone_map{{
+  {{""".format(len(windows_zone_map)))
+
+for entry in windows_zone_map:
+    print('    {{L"{}", L"{}", "{}"}},'.format(entry.windows, entry.territory, 
entry.iana))
+
+print("""  }
+};""")
+
+# <chrono> gives an error if this macro is left defined.
+# Do this last, so that the generated output is not usable unless we reach 
here.
+print("\n#undef _GLIBCXX_GET_WINDOWS_ZONES_MAP")
diff --git a/libstdc++-v3/src/c++20/tzdb.cc b/libstdc++-v3/src/c++20/tzdb.cc
index 9923d14b7a7..666fcc0a221 100644
--- a/libstdc++-v3/src/c++20/tzdb.cc
+++ b/libstdc++-v3/src/c++20/tzdb.cc
@@ -48,6 +48,8 @@
 # define WIN32_LEAN_AND_MEAN
 # include <windows.h>
 # include <psapi.h>
+
+# include <array>
 #endif
 
 #if defined __GTHREADS && ATOMIC_POINTER_LOCK_FREE == 2
@@ -1768,6 +1770,99 @@ namespace std::chrono
 
       return nullptr; // not found
     }
+
+#ifdef _GLIBCXX_HAVE_WINDOWS_H
+    string_view
+    detect_windows_zone() noexcept
+    {
+      DYNAMIC_TIME_ZONE_INFORMATION information{};
+      if (GetDynamicTimeZoneInformation(&information) == TIME_ZONE_ID_INVALID)
+       return {};
+
+      constexpr SYSTEMTIME all_zero_time{};
+      const wstring_view zone_name{ information.TimeZoneKeyName };
+      auto equal = [](const SYSTEMTIME &lhs, const SYSTEMTIME &rhs) noexcept
+       { return memcmp(&lhs, &rhs, sizeof(SYSTEMTIME)) == 0; };
+      // The logic is copied from icu, couldn't find the source.
+      // Detect if DST is disabled.
+      if (information.DynamicDaylightTimeDisabled
+         && equal(information.StandardDate, information.DaylightDate)
+         && ((!zone_name.empty()
+              && equal(information.StandardDate, all_zero_time))
+             || (zone_name.empty()
+                 && !equal(information.StandardDate, all_zero_time))))
+       {
+         if (information.Bias == 0)
+           return "Etc/UTC";
+
+         if (information.Bias % 60 != 0)
+           // If the offset is not in full hours, we can't do anything really.
+           return {};
+
+         const auto raw_index = information.Bias / 60;
+
+         // The bias added to the local time equals UTC. And GMT+X corrosponds
+         // to UTC-X, the sign is negated. Thus we can use the hourly bias as
+         // an index into an array.
+         if (raw_index < 0 && raw_index >= -14)
+           {
+             static array<string_view, 14> table{
+               "Etc/GMT-1",  "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-10", "Etc/GMT-11", "Etc/GMT-12",
+               "Etc/GMT-13", "Etc/GMT-14"
+             };
+             return table[-raw_index - 1];
+           }
+         else if (raw_index > 0 && raw_index <= 12)
+           {
+             static array<string_view, 14> table{
+               "Etc/GMT+1", "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+10", "Etc/GMT+11", "Etc/GMT+12"
+             };
+             return table[raw_index - 1];
+           }
+         return {};
+       }
+
+#define _GLIBCXX_GET_WINDOWS_ZONES_MAP
+#include "windows_zones-map.h"
+#ifdef _GLIBCXX_GET_WINDOWS_ZONES_MAP
+# error "Invalid windows_zones map"
+#endif
+
+      const auto zone_range
+         = ranges::equal_range(windows_zone_map, zone_name, {},
+                               &windows_zone_map_entry::windows_name);
+
+      const auto size = ranges::size(zone_range);
+      if (size == 0)
+       // Unknown zone, we can't detect anything.
+       return {};
+
+      if (size == 1)
+       // Some zones have only one territory, use the quick path.
+       return zone_range.front().iana_name;
+
+      const auto geo_id = GetUserGeoID(GEOCLASS_NATION);
+      // We ask for a 2-letter country code plus the zero terminator. "001" is
+      // only contained in the zone map, not returned by GetGeoInfoW.
+      wchar_t territory[3] = {};
+      if (GetGeoInfoW(geo_id, GEO_ISO2, territory, 3, 0) == 0)
+       // Couldn't detect the territory, fallback to "001", which is the first
+       // entry.
+       return zone_range.front().iana_name;
+
+      const auto iter = ranges::lower_bound(
+         zone_range, territory, {}, &windows_zone_map_entry::territory);
+      if (iter == zone_range.end() || iter->territory != territory)
+       // Territory not within the the map, use "001".
+       return zone_range.front().iana_name;
+
+      return iter->iana_name;
+    }
+#endif
   } // namespace
 
   // Implementation of std::chrono::tzdb::locate_zone(string_view).
@@ -1790,7 +1885,7 @@ namespace std::chrono
   {
     // TODO cache this function's result?
 
-#ifndef _AIX
+#if !defined(_AIX) && !defined(_GLIBCXX_HAVE_WINDOWS_H)
     // Repeat the preprocessor condition used by filesystem::read_symlink,
     // to avoid a dependency on src/c++17/fs_ops.o if it won't work anyway.
 #if defined(_GLIBCXX_HAVE_READLINK) && defined(_GLIBCXX_HAVE_SYS_STAT_H)
@@ -1847,7 +1942,11 @@ namespace std::chrono
                  return tz;
              }
       }
-#else
+#elif defined(_GLIBCXX_HAVE_WINDOWS_H)
+    if (auto tz
+       = do_locate_zone(this->zones, this->links, detect_windows_zone()))
+      return tz;
+#else // defined(_AIX)
     // AIX stores current zone in $TZ in /etc/environment but the value
     // is typically a POSIX time zone name, not IANA zone.
     // https://developer.ibm.com/articles/au-aix-posix/
diff --git a/libstdc++-v3/src/c++20/windows_zones-map.h 
b/libstdc++-v3/src/c++20/windows_zones-map.h
new file mode 100644
index 00000000000..7be736b063d
--- /dev/null
+++ b/libstdc++-v3/src/c++20/windows_zones-map.h
@@ -0,0 +1,407 @@
+// Generated by scripts/gen_windows_zones_map.py, do not edit.
+
+// Copyright The GNU Toolchain Authors.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library 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.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/windows_zones-map.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{chrono}
+ */
+
+#ifndef _GLIBCXX_GET_WINDOWS_ZONES_MAP
+# error "This is not a public header, do not include it directly"
+#endif
+
+struct windows_zone_map_entry
+{
+  wstring_view windows_name;
+  wstring_view territory;
+  string_view iana_name;
+};
+
+static constexpr array<windows_zone_map_entry, 361> windows_zone_map{
+  {
+    {L"AUS Central Standard Time", L"001", "Australia/Darwin"},
+    {L"AUS Eastern Standard Time", L"001", "Australia/Sydney"},
+    {L"Afghanistan Standard Time", L"001", "Asia/Kabul"},
+    {L"Alaskan Standard Time", L"001", "America/Anchorage"},
+    {L"Aleutian Standard Time", L"001", "America/Adak"},
+    {L"Altai Standard Time", L"001", "Asia/Barnaul"},
+    {L"Arab Standard Time", L"001", "Asia/Riyadh"},
+    {L"Arab Standard Time", L"BH", "Asia/Bahrain"},
+    {L"Arab Standard Time", L"KW", "Asia/Kuwait"},
+    {L"Arab Standard Time", L"QA", "Asia/Qatar"},
+    {L"Arab Standard Time", L"YE", "Asia/Aden"},
+    {L"Arabian Standard Time", L"001", "Asia/Dubai"},
+    {L"Arabian Standard Time", L"OM", "Asia/Muscat"},
+    {L"Arabian Standard Time", L"ZZ", "Etc/GMT-4"},
+    {L"Arabic Standard Time", L"001", "Asia/Baghdad"},
+    {L"Argentina Standard Time", L"001", "America/Buenos_Aires"},
+    {L"Astrakhan Standard Time", L"001", "Europe/Astrakhan"},
+    {L"Atlantic Standard Time", L"001", "America/Halifax"},
+    {L"Atlantic Standard Time", L"BM", "Atlantic/Bermuda"},
+    {L"Atlantic Standard Time", L"GL", "America/Thule"},
+    {L"Aus Central W. Standard Time", L"001", "Australia/Eucla"},
+    {L"Azerbaijan Standard Time", L"001", "Asia/Baku"},
+    {L"Azores Standard Time", L"001", "Atlantic/Azores"},
+    {L"Azores Standard Time", L"GL", "America/Scoresbysund"},
+    {L"Bahia Standard Time", L"001", "America/Bahia"},
+    {L"Bangladesh Standard Time", L"001", "Asia/Dhaka"},
+    {L"Bangladesh Standard Time", L"BT", "Asia/Thimphu"},
+    {L"Belarus Standard Time", L"001", "Europe/Minsk"},
+    {L"Bougainville Standard Time", L"001", "Pacific/Bougainville"},
+    {L"Canada Central Standard Time", L"001", "America/Regina"},
+    {L"Cape Verde Standard Time", L"001", "Atlantic/Cape_Verde"},
+    {L"Cape Verde Standard Time", L"ZZ", "Etc/GMT+1"},
+    {L"Caucasus Standard Time", L"001", "Asia/Yerevan"},
+    {L"Cen. Australia Standard Time", L"001", "Australia/Adelaide"},
+    {L"Central America Standard Time", L"001", "America/Guatemala"},
+    {L"Central America Standard Time", L"BZ", "America/Belize"},
+    {L"Central America Standard Time", L"CR", "America/Costa_Rica"},
+    {L"Central America Standard Time", L"EC", "Pacific/Galapagos"},
+    {L"Central America Standard Time", L"HN", "America/Tegucigalpa"},
+    {L"Central America Standard Time", L"NI", "America/Managua"},
+    {L"Central America Standard Time", L"SV", "America/El_Salvador"},
+    {L"Central America Standard Time", L"ZZ", "Etc/GMT+6"},
+    {L"Central Asia Standard Time", L"001", "Asia/Bishkek"},
+    {L"Central Asia Standard Time", L"AQ", "Antarctica/Vostok"},
+    {L"Central Asia Standard Time", L"CN", "Asia/Urumqi"},
+    {L"Central Asia Standard Time", L"IO", "Indian/Chagos"},
+    {L"Central Asia Standard Time", L"ZZ", "Etc/GMT-6"},
+    {L"Central Brazilian Standard Time", L"001", "America/Cuiaba"},
+    {L"Central Europe Standard Time", L"001", "Europe/Budapest"},
+    {L"Central Europe Standard Time", L"AL", "Europe/Tirane"},
+    {L"Central Europe Standard Time", L"CZ", "Europe/Prague"},
+    {L"Central Europe Standard Time", L"ME", "Europe/Podgorica"},
+    {L"Central Europe Standard Time", L"RS", "Europe/Belgrade"},
+    {L"Central Europe Standard Time", L"SI", "Europe/Ljubljana"},
+    {L"Central Europe Standard Time", L"SK", "Europe/Bratislava"},
+    {L"Central European Standard Time", L"001", "Europe/Warsaw"},
+    {L"Central European Standard Time", L"BA", "Europe/Sarajevo"},
+    {L"Central European Standard Time", L"HR", "Europe/Zagreb"},
+    {L"Central European Standard Time", L"MK", "Europe/Skopje"},
+    {L"Central Pacific Standard Time", L"001", "Pacific/Guadalcanal"},
+    {L"Central Pacific Standard Time", L"AQ", "Antarctica/Casey"},
+    {L"Central Pacific Standard Time", L"FM", "Pacific/Ponape"},
+    {L"Central Pacific Standard Time", L"NC", "Pacific/Noumea"},
+    {L"Central Pacific Standard Time", L"VU", "Pacific/Efate"},
+    {L"Central Pacific Standard Time", L"ZZ", "Etc/GMT-11"},
+    {L"Central Standard Time", L"001", "America/Chicago"},
+    {L"Central Standard Time", L"CA", "America/Winnipeg"},
+    {L"Central Standard Time", L"MX", "America/Matamoros"},
+    {L"Central Standard Time (Mexico)", L"001", "America/Mexico_City"},
+    {L"Chatham Islands Standard Time", L"001", "Pacific/Chatham"},
+    {L"China Standard Time", L"001", "Asia/Shanghai"},
+    {L"China Standard Time", L"HK", "Asia/Hong_Kong"},
+    {L"China Standard Time", L"MO", "Asia/Macau"},
+    {L"Cuba Standard Time", L"001", "America/Havana"},
+    {L"Dateline Standard Time", L"001", "Etc/GMT+12"},
+    {L"E. Africa Standard Time", L"001", "Africa/Nairobi"},
+    {L"E. Africa Standard Time", L"AQ", "Antarctica/Syowa"},
+    {L"E. Africa Standard Time", L"DJ", "Africa/Djibouti"},
+    {L"E. Africa Standard Time", L"ER", "Africa/Asmera"},
+    {L"E. Africa Standard Time", L"ET", "Africa/Addis_Ababa"},
+    {L"E. Africa Standard Time", L"KM", "Indian/Comoro"},
+    {L"E. Africa Standard Time", L"MG", "Indian/Antananarivo"},
+    {L"E. Africa Standard Time", L"SO", "Africa/Mogadishu"},
+    {L"E. Africa Standard Time", L"TZ", "Africa/Dar_es_Salaam"},
+    {L"E. Africa Standard Time", L"UG", "Africa/Kampala"},
+    {L"E. Africa Standard Time", L"YT", "Indian/Mayotte"},
+    {L"E. Africa Standard Time", L"ZZ", "Etc/GMT-3"},
+    {L"E. Australia Standard Time", L"001", "Australia/Brisbane"},
+    {L"E. Europe Standard Time", L"001", "Europe/Chisinau"},
+    {L"E. South America Standard Time", L"001", "America/Sao_Paulo"},
+    {L"Easter Island Standard Time", L"001", "Pacific/Easter"},
+    {L"Eastern Standard Time", L"001", "America/New_York"},
+    {L"Eastern Standard Time", L"BS", "America/Nassau"},
+    {L"Eastern Standard Time", L"CA", "America/Toronto"},
+    {L"Eastern Standard Time (Mexico)", L"001", "America/Cancun"},
+    {L"Egypt Standard Time", L"001", "Africa/Cairo"},
+    {L"Ekaterinburg Standard Time", L"001", "Asia/Yekaterinburg"},
+    {L"FLE Standard Time", L"001", "Europe/Kiev"},
+    {L"FLE Standard Time", L"AX", "Europe/Mariehamn"},
+    {L"FLE Standard Time", L"BG", "Europe/Sofia"},
+    {L"FLE Standard Time", L"EE", "Europe/Tallinn"},
+    {L"FLE Standard Time", L"FI", "Europe/Helsinki"},
+    {L"FLE Standard Time", L"LT", "Europe/Vilnius"},
+    {L"FLE Standard Time", L"LV", "Europe/Riga"},
+    {L"Fiji Standard Time", L"001", "Pacific/Fiji"},
+    {L"GMT Standard Time", L"001", "Europe/London"},
+    {L"GMT Standard Time", L"ES", "Atlantic/Canary"},
+    {L"GMT Standard Time", L"FO", "Atlantic/Faeroe"},
+    {L"GMT Standard Time", L"GG", "Europe/Guernsey"},
+    {L"GMT Standard Time", L"IE", "Europe/Dublin"},
+    {L"GMT Standard Time", L"IM", "Europe/Isle_of_Man"},
+    {L"GMT Standard Time", L"JE", "Europe/Jersey"},
+    {L"GMT Standard Time", L"PT", "Europe/Lisbon"},
+    {L"GTB Standard Time", L"001", "Europe/Bucharest"},
+    {L"GTB Standard Time", L"CY", "Asia/Nicosia"},
+    {L"GTB Standard Time", L"GR", "Europe/Athens"},
+    {L"Georgian Standard Time", L"001", "Asia/Tbilisi"},
+    {L"Greenland Standard Time", L"001", "America/Godthab"},
+    {L"Greenwich Standard Time", L"001", "Atlantic/Reykjavik"},
+    {L"Greenwich Standard Time", L"BF", "Africa/Ouagadougou"},
+    {L"Greenwich Standard Time", L"CI", "Africa/Abidjan"},
+    {L"Greenwich Standard Time", L"GH", "Africa/Accra"},
+    {L"Greenwich Standard Time", L"GL", "America/Danmarkshavn"},
+    {L"Greenwich Standard Time", L"GM", "Africa/Banjul"},
+    {L"Greenwich Standard Time", L"GN", "Africa/Conakry"},
+    {L"Greenwich Standard Time", L"GW", "Africa/Bissau"},
+    {L"Greenwich Standard Time", L"LR", "Africa/Monrovia"},
+    {L"Greenwich Standard Time", L"ML", "Africa/Bamako"},
+    {L"Greenwich Standard Time", L"MR", "Africa/Nouakchott"},
+    {L"Greenwich Standard Time", L"SH", "Atlantic/St_Helena"},
+    {L"Greenwich Standard Time", L"SL", "Africa/Freetown"},
+    {L"Greenwich Standard Time", L"SN", "Africa/Dakar"},
+    {L"Greenwich Standard Time", L"TG", "Africa/Lome"},
+    {L"Haiti Standard Time", L"001", "America/Port-au-Prince"},
+    {L"Hawaiian Standard Time", L"001", "Pacific/Honolulu"},
+    {L"Hawaiian Standard Time", L"CK", "Pacific/Rarotonga"},
+    {L"Hawaiian Standard Time", L"PF", "Pacific/Tahiti"},
+    {L"Hawaiian Standard Time", L"ZZ", "Etc/GMT+10"},
+    {L"India Standard Time", L"001", "Asia/Calcutta"},
+    {L"Iran Standard Time", L"001", "Asia/Tehran"},
+    {L"Israel Standard Time", L"001", "Asia/Jerusalem"},
+    {L"Jordan Standard Time", L"001", "Asia/Amman"},
+    {L"Kaliningrad Standard Time", L"001", "Europe/Kaliningrad"},
+    {L"Korea Standard Time", L"001", "Asia/Seoul"},
+    {L"Libya Standard Time", L"001", "Africa/Tripoli"},
+    {L"Line Islands Standard Time", L"001", "Pacific/Kiritimati"},
+    {L"Line Islands Standard Time", L"ZZ", "Etc/GMT-14"},
+    {L"Lord Howe Standard Time", L"001", "Australia/Lord_Howe"},
+    {L"Magadan Standard Time", L"001", "Asia/Magadan"},
+    {L"Magallanes Standard Time", L"001", "America/Punta_Arenas"},
+    {L"Marquesas Standard Time", L"001", "Pacific/Marquesas"},
+    {L"Mauritius Standard Time", L"001", "Indian/Mauritius"},
+    {L"Mauritius Standard Time", L"RE", "Indian/Reunion"},
+    {L"Mauritius Standard Time", L"SC", "Indian/Mahe"},
+    {L"Middle East Standard Time", L"001", "Asia/Beirut"},
+    {L"Montevideo Standard Time", L"001", "America/Montevideo"},
+    {L"Morocco Standard Time", L"001", "Africa/Casablanca"},
+    {L"Morocco Standard Time", L"EH", "Africa/El_Aaiun"},
+    {L"Mountain Standard Time", L"001", "America/Denver"},
+    {L"Mountain Standard Time", L"CA", "America/Edmonton"},
+    {L"Mountain Standard Time", L"MX", "America/Ciudad_Juarez"},
+    {L"Mountain Standard Time (Mexico)", L"001", "America/Mazatlan"},
+    {L"Myanmar Standard Time", L"001", "Asia/Rangoon"},
+    {L"Myanmar Standard Time", L"CC", "Indian/Cocos"},
+    {L"N. Central Asia Standard Time", L"001", "Asia/Novosibirsk"},
+    {L"Namibia Standard Time", L"001", "Africa/Windhoek"},
+    {L"Nepal Standard Time", L"001", "Asia/Katmandu"},
+    {L"New Zealand Standard Time", L"001", "Pacific/Auckland"},
+    {L"New Zealand Standard Time", L"AQ", "Antarctica/McMurdo"},
+    {L"Newfoundland Standard Time", L"001", "America/St_Johns"},
+    {L"Norfolk Standard Time", L"001", "Pacific/Norfolk"},
+    {L"North Asia East Standard Time", L"001", "Asia/Irkutsk"},
+    {L"North Asia Standard Time", L"001", "Asia/Krasnoyarsk"},
+    {L"North Korea Standard Time", L"001", "Asia/Pyongyang"},
+    {L"Omsk Standard Time", L"001", "Asia/Omsk"},
+    {L"Pacific SA Standard Time", L"001", "America/Santiago"},
+    {L"Pacific Standard Time", L"001", "America/Los_Angeles"},
+    {L"Pacific Standard Time", L"CA", "America/Vancouver"},
+    {L"Pacific Standard Time (Mexico)", L"001", "America/Tijuana"},
+    {L"Pakistan Standard Time", L"001", "Asia/Karachi"},
+    {L"Paraguay Standard Time", L"001", "America/Asuncion"},
+    {L"Qyzylorda Standard Time", L"001", "Asia/Qyzylorda"},
+    {L"Romance Standard Time", L"001", "Europe/Paris"},
+    {L"Romance Standard Time", L"BE", "Europe/Brussels"},
+    {L"Romance Standard Time", L"DK", "Europe/Copenhagen"},
+    {L"Romance Standard Time", L"ES", "Europe/Madrid"},
+    {L"Russia Time Zone 10", L"001", "Asia/Srednekolymsk"},
+    {L"Russia Time Zone 11", L"001", "Asia/Kamchatka"},
+    {L"Russia Time Zone 3", L"001", "Europe/Samara"},
+    {L"Russian Standard Time", L"001", "Europe/Moscow"},
+    {L"Russian Standard Time", L"UA", "Europe/Simferopol"},
+    {L"SA Eastern Standard Time", L"001", "America/Cayenne"},
+    {L"SA Eastern Standard Time", L"AQ", "Antarctica/Rothera"},
+    {L"SA Eastern Standard Time", L"BR", "America/Fortaleza"},
+    {L"SA Eastern Standard Time", L"FK", "Atlantic/Stanley"},
+    {L"SA Eastern Standard Time", L"SR", "America/Paramaribo"},
+    {L"SA Eastern Standard Time", L"ZZ", "Etc/GMT+3"},
+    {L"SA Pacific Standard Time", L"001", "America/Bogota"},
+    {L"SA Pacific Standard Time", L"BR", "America/Rio_Branco"},
+    {L"SA Pacific Standard Time", L"CA", "America/Coral_Harbour"},
+    {L"SA Pacific Standard Time", L"EC", "America/Guayaquil"},
+    {L"SA Pacific Standard Time", L"JM", "America/Jamaica"},
+    {L"SA Pacific Standard Time", L"KY", "America/Cayman"},
+    {L"SA Pacific Standard Time", L"PA", "America/Panama"},
+    {L"SA Pacific Standard Time", L"PE", "America/Lima"},
+    {L"SA Pacific Standard Time", L"ZZ", "Etc/GMT+5"},
+    {L"SA Western Standard Time", L"001", "America/La_Paz"},
+    {L"SA Western Standard Time", L"AG", "America/Antigua"},
+    {L"SA Western Standard Time", L"AI", "America/Anguilla"},
+    {L"SA Western Standard Time", L"AW", "America/Aruba"},
+    {L"SA Western Standard Time", L"BB", "America/Barbados"},
+    {L"SA Western Standard Time", L"BL", "America/St_Barthelemy"},
+    {L"SA Western Standard Time", L"BQ", "America/Kralendijk"},
+    {L"SA Western Standard Time", L"BR", "America/Manaus"},
+    {L"SA Western Standard Time", L"CA", "America/Blanc-Sablon"},
+    {L"SA Western Standard Time", L"CW", "America/Curacao"},
+    {L"SA Western Standard Time", L"DM", "America/Dominica"},
+    {L"SA Western Standard Time", L"DO", "America/Santo_Domingo"},
+    {L"SA Western Standard Time", L"GD", "America/Grenada"},
+    {L"SA Western Standard Time", L"GP", "America/Guadeloupe"},
+    {L"SA Western Standard Time", L"GY", "America/Guyana"},
+    {L"SA Western Standard Time", L"KN", "America/St_Kitts"},
+    {L"SA Western Standard Time", L"LC", "America/St_Lucia"},
+    {L"SA Western Standard Time", L"MF", "America/Marigot"},
+    {L"SA Western Standard Time", L"MQ", "America/Martinique"},
+    {L"SA Western Standard Time", L"MS", "America/Montserrat"},
+    {L"SA Western Standard Time", L"PR", "America/Puerto_Rico"},
+    {L"SA Western Standard Time", L"SX", "America/Lower_Princes"},
+    {L"SA Western Standard Time", L"TT", "America/Port_of_Spain"},
+    {L"SA Western Standard Time", L"VC", "America/St_Vincent"},
+    {L"SA Western Standard Time", L"VG", "America/Tortola"},
+    {L"SA Western Standard Time", L"VI", "America/St_Thomas"},
+    {L"SA Western Standard Time", L"ZZ", "Etc/GMT+4"},
+    {L"SE Asia Standard Time", L"001", "Asia/Bangkok"},
+    {L"SE Asia Standard Time", L"AQ", "Antarctica/Davis"},
+    {L"SE Asia Standard Time", L"CX", "Indian/Christmas"},
+    {L"SE Asia Standard Time", L"ID", "Asia/Jakarta"},
+    {L"SE Asia Standard Time", L"KH", "Asia/Phnom_Penh"},
+    {L"SE Asia Standard Time", L"LA", "Asia/Vientiane"},
+    {L"SE Asia Standard Time", L"VN", "Asia/Saigon"},
+    {L"SE Asia Standard Time", L"ZZ", "Etc/GMT-7"},
+    {L"Saint Pierre Standard Time", L"001", "America/Miquelon"},
+    {L"Sakhalin Standard Time", L"001", "Asia/Sakhalin"},
+    {L"Samoa Standard Time", L"001", "Pacific/Apia"},
+    {L"Sao Tome Standard Time", L"001", "Africa/Sao_Tome"},
+    {L"Saratov Standard Time", L"001", "Europe/Saratov"},
+    {L"Singapore Standard Time", L"001", "Asia/Singapore"},
+    {L"Singapore Standard Time", L"BN", "Asia/Brunei"},
+    {L"Singapore Standard Time", L"ID", "Asia/Makassar"},
+    {L"Singapore Standard Time", L"MY", "Asia/Kuala_Lumpur"},
+    {L"Singapore Standard Time", L"PH", "Asia/Manila"},
+    {L"Singapore Standard Time", L"ZZ", "Etc/GMT-8"},
+    {L"South Africa Standard Time", L"001", "Africa/Johannesburg"},
+    {L"South Africa Standard Time", L"BI", "Africa/Bujumbura"},
+    {L"South Africa Standard Time", L"BW", "Africa/Gaborone"},
+    {L"South Africa Standard Time", L"CD", "Africa/Lubumbashi"},
+    {L"South Africa Standard Time", L"LS", "Africa/Maseru"},
+    {L"South Africa Standard Time", L"MW", "Africa/Blantyre"},
+    {L"South Africa Standard Time", L"MZ", "Africa/Maputo"},
+    {L"South Africa Standard Time", L"RW", "Africa/Kigali"},
+    {L"South Africa Standard Time", L"SZ", "Africa/Mbabane"},
+    {L"South Africa Standard Time", L"ZM", "Africa/Lusaka"},
+    {L"South Africa Standard Time", L"ZW", "Africa/Harare"},
+    {L"South Africa Standard Time", L"ZZ", "Etc/GMT-2"},
+    {L"South Sudan Standard Time", L"001", "Africa/Juba"},
+    {L"Sri Lanka Standard Time", L"001", "Asia/Colombo"},
+    {L"Sudan Standard Time", L"001", "Africa/Khartoum"},
+    {L"Syria Standard Time", L"001", "Asia/Damascus"},
+    {L"Taipei Standard Time", L"001", "Asia/Taipei"},
+    {L"Tasmania Standard Time", L"001", "Australia/Hobart"},
+    {L"Tocantins Standard Time", L"001", "America/Araguaina"},
+    {L"Tokyo Standard Time", L"001", "Asia/Tokyo"},
+    {L"Tokyo Standard Time", L"ID", "Asia/Jayapura"},
+    {L"Tokyo Standard Time", L"PW", "Pacific/Palau"},
+    {L"Tokyo Standard Time", L"TL", "Asia/Dili"},
+    {L"Tokyo Standard Time", L"ZZ", "Etc/GMT-9"},
+    {L"Tomsk Standard Time", L"001", "Asia/Tomsk"},
+    {L"Tonga Standard Time", L"001", "Pacific/Tongatapu"},
+    {L"Transbaikal Standard Time", L"001", "Asia/Chita"},
+    {L"Turkey Standard Time", L"001", "Europe/Istanbul"},
+    {L"Turks And Caicos Standard Time", L"001", "America/Grand_Turk"},
+    {L"US Eastern Standard Time", L"001", "America/Indianapolis"},
+    {L"US Mountain Standard Time", L"001", "America/Phoenix"},
+    {L"US Mountain Standard Time", L"CA", "America/Creston"},
+    {L"US Mountain Standard Time", L"MX", "America/Hermosillo"},
+    {L"US Mountain Standard Time", L"ZZ", "Etc/GMT+7"},
+    {L"UTC", L"001", "Etc/UTC"},
+    {L"UTC+12", L"001", "Etc/GMT-12"},
+    {L"UTC+12", L"KI", "Pacific/Tarawa"},
+    {L"UTC+12", L"MH", "Pacific/Majuro"},
+    {L"UTC+12", L"NR", "Pacific/Nauru"},
+    {L"UTC+12", L"TV", "Pacific/Funafuti"},
+    {L"UTC+12", L"UM", "Pacific/Wake"},
+    {L"UTC+12", L"WF", "Pacific/Wallis"},
+    {L"UTC+13", L"001", "Etc/GMT-13"},
+    {L"UTC+13", L"KI", "Pacific/Enderbury"},
+    {L"UTC+13", L"TK", "Pacific/Fakaofo"},
+    {L"UTC-02", L"001", "Etc/GMT+2"},
+    {L"UTC-02", L"BR", "America/Noronha"},
+    {L"UTC-02", L"GS", "Atlantic/South_Georgia"},
+    {L"UTC-08", L"001", "Etc/GMT+8"},
+    {L"UTC-08", L"PN", "Pacific/Pitcairn"},
+    {L"UTC-09", L"001", "Etc/GMT+9"},
+    {L"UTC-09", L"PF", "Pacific/Gambier"},
+    {L"UTC-11", L"001", "Etc/GMT+11"},
+    {L"UTC-11", L"AS", "Pacific/Pago_Pago"},
+    {L"UTC-11", L"NU", "Pacific/Niue"},
+    {L"UTC-11", L"UM", "Pacific/Midway"},
+    {L"Ulaanbaatar Standard Time", L"001", "Asia/Ulaanbaatar"},
+    {L"Venezuela Standard Time", L"001", "America/Caracas"},
+    {L"Vladivostok Standard Time", L"001", "Asia/Vladivostok"},
+    {L"Volgograd Standard Time", L"001", "Europe/Volgograd"},
+    {L"W. Australia Standard Time", L"001", "Australia/Perth"},
+    {L"W. Central Africa Standard Time", L"001", "Africa/Lagos"},
+    {L"W. Central Africa Standard Time", L"AO", "Africa/Luanda"},
+    {L"W. Central Africa Standard Time", L"BJ", "Africa/Porto-Novo"},
+    {L"W. Central Africa Standard Time", L"CD", "Africa/Kinshasa"},
+    {L"W. Central Africa Standard Time", L"CF", "Africa/Bangui"},
+    {L"W. Central Africa Standard Time", L"CG", "Africa/Brazzaville"},
+    {L"W. Central Africa Standard Time", L"CM", "Africa/Douala"},
+    {L"W. Central Africa Standard Time", L"DZ", "Africa/Algiers"},
+    {L"W. Central Africa Standard Time", L"GA", "Africa/Libreville"},
+    {L"W. Central Africa Standard Time", L"GQ", "Africa/Malabo"},
+    {L"W. Central Africa Standard Time", L"NE", "Africa/Niamey"},
+    {L"W. Central Africa Standard Time", L"TD", "Africa/Ndjamena"},
+    {L"W. Central Africa Standard Time", L"TN", "Africa/Tunis"},
+    {L"W. Central Africa Standard Time", L"ZZ", "Etc/GMT-1"},
+    {L"W. Europe Standard Time", L"001", "Europe/Berlin"},
+    {L"W. Europe Standard Time", L"AD", "Europe/Andorra"},
+    {L"W. Europe Standard Time", L"AT", "Europe/Vienna"},
+    {L"W. Europe Standard Time", L"CH", "Europe/Zurich"},
+    {L"W. Europe Standard Time", L"GI", "Europe/Gibraltar"},
+    {L"W. Europe Standard Time", L"IT", "Europe/Rome"},
+    {L"W. Europe Standard Time", L"LI", "Europe/Vaduz"},
+    {L"W. Europe Standard Time", L"LU", "Europe/Luxembourg"},
+    {L"W. Europe Standard Time", L"MC", "Europe/Monaco"},
+    {L"W. Europe Standard Time", L"MT", "Europe/Malta"},
+    {L"W. Europe Standard Time", L"NL", "Europe/Amsterdam"},
+    {L"W. Europe Standard Time", L"NO", "Europe/Oslo"},
+    {L"W. Europe Standard Time", L"SE", "Europe/Stockholm"},
+    {L"W. Europe Standard Time", L"SJ", "Arctic/Longyearbyen"},
+    {L"W. Europe Standard Time", L"SM", "Europe/San_Marino"},
+    {L"W. Europe Standard Time", L"VA", "Europe/Vatican"},
+    {L"W. Mongolia Standard Time", L"001", "Asia/Hovd"},
+    {L"West Asia Standard Time", L"001", "Asia/Tashkent"},
+    {L"West Asia Standard Time", L"AQ", "Antarctica/Mawson"},
+    {L"West Asia Standard Time", L"KZ", "Asia/Oral"},
+    {L"West Asia Standard Time", L"MV", "Indian/Maldives"},
+    {L"West Asia Standard Time", L"TF", "Indian/Kerguelen"},
+    {L"West Asia Standard Time", L"TJ", "Asia/Dushanbe"},
+    {L"West Asia Standard Time", L"TM", "Asia/Ashgabat"},
+    {L"West Asia Standard Time", L"ZZ", "Etc/GMT-5"},
+    {L"West Bank Standard Time", L"001", "Asia/Hebron"},
+    {L"West Pacific Standard Time", L"001", "Pacific/Port_Moresby"},
+    {L"West Pacific Standard Time", L"AQ", "Antarctica/DumontDUrville"},
+    {L"West Pacific Standard Time", L"FM", "Pacific/Truk"},
+    {L"West Pacific Standard Time", L"GU", "Pacific/Guam"},
+    {L"West Pacific Standard Time", L"MP", "Pacific/Saipan"},
+    {L"West Pacific Standard Time", L"ZZ", "Etc/GMT-10"},
+    {L"Yakutsk Standard Time", L"001", "Asia/Yakutsk"},
+    {L"Yukon Standard Time", L"001", "America/Whitehorse"},
+  }
+};
+
+#undef _GLIBCXX_GET_WINDOWS_ZONES_MAP
-- 
2.50.0

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