diff --git a/R/cpp11.R b/R/cpp11.R
index 738e6296..f89b14b1 100644
--- a/R/cpp11.R
+++ b/R/cpp11.R
@@ -172,6 +172,10 @@ clock_set_install <- function(path) {
   invisible(.Call("_clock_clock_set_install", path, PACKAGE = "clock"))
 }
 
+clock_set_tz_dir <- function(path) {
+  invisible(.Call("_clock_clock_set_tz_dir", path, PACKAGE = "clock"))
+}
+
 iso_year_week_day_check_range_cpp <- function(x, component_string, arg) {
   invisible(.Call("_clock_iso_year_week_day_check_range_cpp", x, component_string, arg, PACKAGE = "clock"))
 }
diff --git a/R/zzz.R b/R/zzz.R
index 8a92083c..04659f2b 100644
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -1,6 +1,15 @@
 .onLoad <- function(libname, pkgname) {
-  tzdata <- system.file("tzdata", package = "clock", mustWork = TRUE)
-  clock_set_install(tzdata)
+  sysname <- tolower(Sys.info()[["sysname"]])
+
+  if (identical(sysname, "windows")) {
+    # Use shipped text version of the tzdb
+    tzdata <- system.file("tzdata", package = "clock", mustWork = TRUE)
+    clock_set_install(tzdata)
+  } else {
+    # Use shipped binary version of the tzdb
+    tz_dir <- system.file("zoneinfo", package = "clock", mustWork = TRUE)
+    clock_set_tz_dir(tz_dir)
+  }
 
   vctrs::s3_register("pillar::pillar_shaft", "clock_calendar", pillar_shaft.clock_calendar)
   vctrs::s3_register("pillar::pillar_shaft", "clock_time_point", pillar_shaft.clock_time_point)
diff --git a/inst/include/date/date.h b/inst/include/date/date.h
index bf5fe027..1ad54246 100644
--- a/inst/include/date/date.h
+++ b/inst/include/date/date.h
@@ -45,9 +45,7 @@
 #include <cctype>
 #include <chrono>
 #include <climits>
-#if !(__cplusplus >= 201402)
-#  include <cmath>
-#endif
+#include <cmath>
 #include <cstddef>
 #include <cstdint>
 #include <cstdlib>
@@ -6169,9 +6167,16 @@ long double
 read_long_double(std::basic_istream<CharT, Traits>& is, unsigned m = 1, unsigned M = 10)
 {
     unsigned count = 0;
+    unsigned fcount = 0;
+    unsigned long long i = 0;
+    unsigned long long f = 0;
+    bool parsing_fraction = false;
+#if ONLY_C_LOCALE
+    typename Traits::int_type decimal_point = '.';
+#else
     auto decimal_point = Traits::to_int_type(
         std::use_facet<std::numpunct<CharT>>(is.getloc()).decimal_point());
-    std::string buf;
+#endif
     while (true)
     {
         auto ic = is.peek();
@@ -6179,18 +6184,25 @@ read_long_double(std::basic_istream<CharT, Traits>& is, unsigned m = 1, unsigned
             break;
         if (Traits::eq_int_type(ic, decimal_point))
         {
-            buf += '.';
             decimal_point = Traits::eof();
-            is.get();
+            parsing_fraction = true;
         }
         else
         {
             auto c = static_cast<char>(Traits::to_char_type(ic));
             if (!('0' <= c && c <= '9'))
                 break;
-            buf += c;
-            (void)is.get();
+            if (!parsing_fraction)
+            {
+                i = 10*i + static_cast<unsigned>(c - '0');
+            }
+            else
+            {
+                f = 10*f + static_cast<unsigned>(c - '0');
+                ++fcount;
+            }
         }
+        (void)is.get();
         if (++count == M)
             break;
     }
@@ -6199,7 +6211,7 @@ read_long_double(std::basic_istream<CharT, Traits>& is, unsigned m = 1, unsigned
         is.setstate(std::ios::failbit);
         return 0;
     }
-    return std::stold(buf);
+    return i + f/std::pow(10.L, fcount);
 }
 
 struct rs
@@ -6966,7 +6978,7 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
 #else
                         auto nm = detail::ampm_names();
                         auto i = detail::scan_keyword(is, nm.first, nm.second) - nm.first;
-                        tp = i;
+                        tp = static_cast<decltype(tp)>(i);
 #endif
                         checked_set(p, tp, not_a_ampm, is);
                     }
diff --git a/inst/include/date/tz.h b/inst/include/date/tz.h
index 49210683..a0d8ed44 100644
--- a/inst/include/date/tz.h
+++ b/inst/include/date/tz.h
@@ -47,8 +47,16 @@
 #  define USE_OS_TZDB 0
 #endif
 
+#ifndef USE_BINARY_TZDB
+#  define USE_BINARY_TZDB USE_OS_TZDB
+#endif
+
+#if (!USE_BINARY_TZDB) && (USE_OS_TZDB)
+#  define error "If USE_OS_TZDB is used, then USE_BINARY_TZDB must also be used."
+#endif
+
 #ifndef HAS_REMOTE_API
-#  if USE_OS_TZDB == 0
+#  if USE_BINARY_TZDB == 0
 #    ifdef _WIN32
 #      define HAS_REMOTE_API 0
 #    else
@@ -64,8 +72,8 @@
 # pragma clang diagnostic ignored "-Wconstant-logical-operand"
 #endif
 
-static_assert(!(USE_OS_TZDB && HAS_REMOTE_API),
-              "USE_OS_TZDB and HAS_REMOTE_API can not be used together");
+static_assert(!(USE_BINARY_TZDB && HAS_REMOTE_API),
+              "USE_BINARY_TZDB and HAS_REMOTE_API can not be used together");
 
 #ifdef __clang__
 # pragma clang diagnostic pop
@@ -82,9 +90,9 @@ static_assert(HAS_REMOTE_API == 0 ? AUTO_DOWNLOAD == 0 : true,
 #  define USE_SHELL_API 1
 #endif
 
-#if USE_OS_TZDB
+#if USE_OS_TZDB || USE_BINARY_TZDB
 #  ifdef _WIN32
-#    error "USE_OS_TZDB can not be used on Windows"
+#    error "USE_OS_TZDB and USE_BINARY_TZDB can not be used on Windows"
 #  endif
 #endif
 
@@ -764,13 +772,13 @@ operator!=(const zoned_time<Duration1, TimeZonePtr>& x,
 
 namespace detail
 {
-#  if USE_OS_TZDB
+#  if USE_BINARY_TZDB
     struct transition;
     struct expanded_ttinfo;
-#  else  // !USE_OS_TZDB
+#  else  // !USE_BINARY_TZDB
     struct zonelet;
     class Rule;
-#  endif  // !USE_OS_TZDB
+#  endif  // !USE_BINARY_TZDB
 }
 
 #endif  // !defined(_MSC_VER) || (_MSC_VER >= 1900)
@@ -779,12 +787,12 @@ class time_zone
 {
 private:
     std::string                          name_;
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
     std::vector<detail::transition>      transitions_;
     std::vector<detail::expanded_ttinfo> ttinfos_;
-#else  // !USE_OS_TZDB
+#else  // !USE_BINARY_TZDB
     std::vector<detail::zonelet>         zonelets_;
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
     std::unique_ptr<std::once_flag>      adjusted_;
 
 public:
@@ -819,9 +827,9 @@ class time_zone
     friend bool operator< (const time_zone& x, const time_zone& y) NOEXCEPT;
     friend DATE_API std::ostream& operator<<(std::ostream& os, const time_zone& z);
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
     DATE_API void add(const std::string& s);
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 private:
     DATE_API sys_info   get_info_impl(sys_seconds tp) const;
@@ -834,7 +842,7 @@ class time_zone
         sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
         to_sys_impl(local_time<Duration> tp, choose, std::true_type) const;
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
     DATE_API void init() const;
     DATE_API void init_impl();
     DATE_API sys_info
@@ -844,11 +852,11 @@ class time_zone
     DATE_API void
     load_data(std::istream& inf, std::int32_t tzh_leapcnt, std::int32_t tzh_timecnt,
                                  std::int32_t tzh_typecnt, std::int32_t tzh_charcnt);
-#else  // !USE_OS_TZDB
+#else  // !USE_BINARY_TZDB
     DATE_API sys_info   get_info_impl(sys_seconds tp, int timezone) const;
     DATE_API void adjust_infos(const std::vector<detail::Rule>& rules);
     DATE_API void parse_info(std::istream& in);
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 };
 
 #if defined(_MSC_VER) && (_MSC_VER < 1900)
@@ -958,7 +966,7 @@ time_zone::to_sys_impl(local_time<Duration> tp, choose, std::true_type) const
     return sys_time<Duration>{tp.time_since_epoch()} - i.first.offset;
 }
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
 
 class time_zone_link
 {
@@ -984,7 +992,7 @@ inline bool operator> (const time_zone_link& x, const time_zone_link& y) {return
 inline bool operator<=(const time_zone_link& x, const time_zone_link& y) {return !(y < x);}
 inline bool operator>=(const time_zone_link& x, const time_zone_link& y) {return !(x < y);}
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 class leap_second
 {
@@ -992,7 +1000,7 @@ class leap_second
     sys_seconds date_;
 
 public:
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
     DATE_API explicit leap_second(const sys_seconds& s, detail::undocumented);
 #else
     DATE_API explicit leap_second(const std::string& s, detail::undocumented);
@@ -1151,11 +1159,11 @@ struct tzdb
 {
     std::string                 version = "unknown";
     std::vector<time_zone>      zones;
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
     std::vector<time_zone_link> links;
 #endif
     std::vector<leap_second>    leap_seconds;
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
     std::vector<detail::Rule>   rules;
 #endif
 #ifdef _WIN32
@@ -1294,12 +1302,14 @@ tzdb_list::cend() const NOEXCEPT
 
 DATE_API tzdb_list& get_tzdb_list();
 
-#if !USE_OS_TZDB
-
+#if USE_BINARY_TZDB
+#  if !USE_OS_TZDB
+DATE_API void set_tz_dir(const std::string& tz_dir);
+#  endif // !USE_OS_TZDB
+#else // !USE_BINARY_TZDB
 DATE_API const tzdb& reload_tzdb();
 DATE_API void        set_install(const std::string& install);
-
-#endif  // !USE_OS_TZDB
+#endif // USE_BINARY_TZDB
 
 #if HAS_REMOTE_API
 
diff --git a/inst/include/date/tz_private.h b/inst/include/date/tz_private.h
index aec01d04..d9a9b137 100644
--- a/inst/include/date/tz_private.h
+++ b/inst/include/date/tz_private.h
@@ -40,7 +40,7 @@ namespace date
 namespace detail
 {
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
 
 enum class tz {utc, local, standard};
 
@@ -256,7 +256,7 @@ struct zonelet
     zonelet& operator=(const zonelet&) = delete;
 };
 
-#else  // USE_OS_TZDB
+#else  // USE_BINARY_TZDB
 
 struct ttinfo
 {
@@ -303,7 +303,7 @@ struct transition
     }
 };
 
-#endif  // USE_OS_TZDB
+#endif  // USE_BINARY_TZDB
 
 }  // namespace detail
 
diff --git a/inst/zoneinfo/Africa/Abidjan b/inst/zoneinfo/Africa/Abidjan
new file mode 100644
index 00000000..28b32ab2
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index 00000000..697b9933
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index 00000000..9a2918f4
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index 00000000..52753c0f
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index 00000000..9a2918f4
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diff --git a/inst/zoneinfo/Africa/Djibouti b/inst/zoneinfo/Africa/Djibouti
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index 00000000..066fbed0
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index 00000000..59f3759c
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diff --git a/inst/zoneinfo/America/Araguaina b/inst/zoneinfo/America/Araguaina
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diff --git a/inst/zoneinfo/Pacific/Easter b/inst/zoneinfo/Pacific/Easter
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diff --git a/inst/zoneinfo/Pacific/Efate b/inst/zoneinfo/Pacific/Efate
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diff --git a/inst/zoneinfo/Pacific/Enderbury b/inst/zoneinfo/Pacific/Enderbury
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diff --git a/inst/zoneinfo/Pacific/Fakaofo b/inst/zoneinfo/Pacific/Fakaofo
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diff --git a/inst/zoneinfo/Pacific/Fiji b/inst/zoneinfo/Pacific/Fiji
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diff --git a/inst/zoneinfo/Pacific/Funafuti b/inst/zoneinfo/Pacific/Funafuti
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diff --git a/inst/zoneinfo/Pacific/Galapagos b/inst/zoneinfo/Pacific/Galapagos
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diff --git a/inst/zoneinfo/Pacific/Guadalcanal b/inst/zoneinfo/Pacific/Guadalcanal
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diff --git a/inst/zoneinfo/Pacific/Honolulu b/inst/zoneinfo/Pacific/Honolulu
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diff --git a/inst/zoneinfo/US/East-Indiana b/inst/zoneinfo/US/East-Indiana
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diff --git a/inst/zoneinfo/US/Samoa b/inst/zoneinfo/US/Samoa
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diff --git a/inst/zoneinfo/UTC b/inst/zoneinfo/UTC
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index 00000000..91558be0
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diff --git a/inst/zoneinfo/Universal b/inst/zoneinfo/Universal
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diff --git a/inst/zoneinfo/W-SU b/inst/zoneinfo/W-SU
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diff --git a/inst/zoneinfo/WET b/inst/zoneinfo/WET
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diff --git a/inst/zoneinfo/Zulu b/inst/zoneinfo/Zulu
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diff --git a/inst/zoneinfo/iso3166.tab b/inst/zoneinfo/iso3166.tab
new file mode 100644
index 00000000..a4ff61a4
--- /dev/null
+++ b/inst/zoneinfo/iso3166.tab
@@ -0,0 +1,274 @@
+# ISO 3166 alpha-2 country codes
+#
+# This file is in the public domain, so clarified as of
+# 2009-05-17 by Arthur David Olson.
+#
+# From Paul Eggert (2015-05-02):
+# This file contains a table of two-letter country codes.  Columns are
+# separated by a single tab.  Lines beginning with '#' are comments.
+# All text uses UTF-8 encoding.  The columns of the table are as follows:
+#
+# 1.  ISO 3166-1 alpha-2 country code, current as of
+#     ISO 3166-1 N976 (2018-11-06).  See: Updates on ISO 3166-1
+#     https://isotc.iso.org/livelink/livelink/Open/16944257
+# 2.  The usual English name for the coded region,
+#     chosen so that alphabetic sorting of subsets produces helpful lists.
+#     This is not the same as the English name in the ISO 3166 tables.
+#
+# The table is sorted by country code.
+#
+# This table is intended as an aid for users, to help them select time
+# zone data appropriate for their practical needs.  It is not intended
+# to take or endorse any position on legal or territorial claims.
+#
+#country-
+#code	name of country, territory, area, or subdivision
+AD	Andorra
+AE	United Arab Emirates
+AF	Afghanistan
+AG	Antigua & Barbuda
+AI	Anguilla
+AL	Albania
+AM	Armenia
+AO	Angola
+AQ	Antarctica
+AR	Argentina
+AS	Samoa (American)
+AT	Austria
+AU	Australia
+AW	Aruba
+AX	Åland Islands
+AZ	Azerbaijan
+BA	Bosnia & Herzegovina
+BB	Barbados
+BD	Bangladesh
+BE	Belgium
+BF	Burkina Faso
+BG	Bulgaria
+BH	Bahrain
+BI	Burundi
+BJ	Benin
+BL	St Barthelemy
+BM	Bermuda
+BN	Brunei
+BO	Bolivia
+BQ	Caribbean NL
+BR	Brazil
+BS	Bahamas
+BT	Bhutan
+BV	Bouvet Island
+BW	Botswana
+BY	Belarus
+BZ	Belize
+CA	Canada
+CC	Cocos (Keeling) Islands
+CD	Congo (Dem. Rep.)
+CF	Central African Rep.
+CG	Congo (Rep.)
+CH	Switzerland
+CI	Côte d'Ivoire
+CK	Cook Islands
+CL	Chile
+CM	Cameroon
+CN	China
+CO	Colombia
+CR	Costa Rica
+CU	Cuba
+CV	Cape Verde
+CW	Curaçao
+CX	Christmas Island
+CY	Cyprus
+CZ	Czech Republic
+DE	Germany
+DJ	Djibouti
+DK	Denmark
+DM	Dominica
+DO	Dominican Republic
+DZ	Algeria
+EC	Ecuador
+EE	Estonia
+EG	Egypt
+EH	Western Sahara
+ER	Eritrea
+ES	Spain
+ET	Ethiopia
+FI	Finland
+FJ	Fiji
+FK	Falkland Islands
+FM	Micronesia
+FO	Faroe Islands
+FR	France
+GA	Gabon
+GB	Britain (UK)
+GD	Grenada
+GE	Georgia
+GF	French Guiana
+GG	Guernsey
+GH	Ghana
+GI	Gibraltar
+GL	Greenland
+GM	Gambia
+GN	Guinea
+GP	Guadeloupe
+GQ	Equatorial Guinea
+GR	Greece
+GS	South Georgia & the South Sandwich Islands
+GT	Guatemala
+GU	Guam
+GW	Guinea-Bissau
+GY	Guyana
+HK	Hong Kong
+HM	Heard Island & McDonald Islands
+HN	Honduras
+HR	Croatia
+HT	Haiti
+HU	Hungary
+ID	Indonesia
+IE	Ireland
+IL	Israel
+IM	Isle of Man
+IN	India
+IO	British Indian Ocean Territory
+IQ	Iraq
+IR	Iran
+IS	Iceland
+IT	Italy
+JE	Jersey
+JM	Jamaica
+JO	Jordan
+JP	Japan
+KE	Kenya
+KG	Kyrgyzstan
+KH	Cambodia
+KI	Kiribati
+KM	Comoros
+KN	St Kitts & Nevis
+KP	Korea (North)
+KR	Korea (South)
+KW	Kuwait
+KY	Cayman Islands
+KZ	Kazakhstan
+LA	Laos
+LB	Lebanon
+LC	St Lucia
+LI	Liechtenstein
+LK	Sri Lanka
+LR	Liberia
+LS	Lesotho
+LT	Lithuania
+LU	Luxembourg
+LV	Latvia
+LY	Libya
+MA	Morocco
+MC	Monaco
+MD	Moldova
+ME	Montenegro
+MF	St Martin (French)
+MG	Madagascar
+MH	Marshall Islands
+MK	North Macedonia
+ML	Mali
+MM	Myanmar (Burma)
+MN	Mongolia
+MO	Macau
+MP	Northern Mariana Islands
+MQ	Martinique
+MR	Mauritania
+MS	Montserrat
+MT	Malta
+MU	Mauritius
+MV	Maldives
+MW	Malawi
+MX	Mexico
+MY	Malaysia
+MZ	Mozambique
+NA	Namibia
+NC	New Caledonia
+NE	Niger
+NF	Norfolk Island
+NG	Nigeria
+NI	Nicaragua
+NL	Netherlands
+NO	Norway
+NP	Nepal
+NR	Nauru
+NU	Niue
+NZ	New Zealand
+OM	Oman
+PA	Panama
+PE	Peru
+PF	French Polynesia
+PG	Papua New Guinea
+PH	Philippines
+PK	Pakistan
+PL	Poland
+PM	St Pierre & Miquelon
+PN	Pitcairn
+PR	Puerto Rico
+PS	Palestine
+PT	Portugal
+PW	Palau
+PY	Paraguay
+QA	Qatar
+RE	Réunion
+RO	Romania
+RS	Serbia
+RU	Russia
+RW	Rwanda
+SA	Saudi Arabia
+SB	Solomon Islands
+SC	Seychelles
+SD	Sudan
+SE	Sweden
+SG	Singapore
+SH	St Helena
+SI	Slovenia
+SJ	Svalbard & Jan Mayen
+SK	Slovakia
+SL	Sierra Leone
+SM	San Marino
+SN	Senegal
+SO	Somalia
+SR	Suriname
+SS	South Sudan
+ST	Sao Tome & Principe
+SV	El Salvador
+SX	St Maarten (Dutch)
+SY	Syria
+SZ	Eswatini (Swaziland)
+TC	Turks & Caicos Is
+TD	Chad
+TF	French Southern & Antarctic Lands
+TG	Togo
+TH	Thailand
+TJ	Tajikistan
+TK	Tokelau
+TL	East Timor
+TM	Turkmenistan
+TN	Tunisia
+TO	Tonga
+TR	Turkey
+TT	Trinidad & Tobago
+TV	Tuvalu
+TW	Taiwan
+TZ	Tanzania
+UA	Ukraine
+UG	Uganda
+UM	US minor outlying islands
+US	United States
+UY	Uruguay
+UZ	Uzbekistan
+VA	Vatican City
+VC	St Vincent
+VE	Venezuela
+VG	Virgin Islands (UK)
+VI	Virgin Islands (US)
+VN	Vietnam
+VU	Vanuatu
+WF	Wallis & Futuna
+WS	Samoa (western)
+YE	Yemen
+YT	Mayotte
+ZA	South Africa
+ZM	Zambia
+ZW	Zimbabwe
diff --git a/inst/zoneinfo/localtime b/inst/zoneinfo/localtime
new file mode 100644
index 00000000..afeeb88d
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diff --git a/inst/zoneinfo/zone1970.tab b/inst/zoneinfo/zone1970.tab
new file mode 100644
index 00000000..53ee77e8
--- /dev/null
+++ b/inst/zoneinfo/zone1970.tab
@@ -0,0 +1,384 @@
+# tzdb timezone descriptions
+#
+# This file is in the public domain.
+#
+# From Paul Eggert (2018-06-27):
+# This file contains a table where each row stands for a timezone where
+# civil timestamps have agreed since 1970.  Columns are separated by
+# a single tab.  Lines beginning with '#' are comments.  All text uses
+# UTF-8 encoding.  The columns of the table are as follows:
+#
+# 1.  The countries that overlap the timezone, as a comma-separated list
+#     of ISO 3166 2-character country codes.  See the file 'iso3166.tab'.
+# 2.  Latitude and longitude of the timezone's principal location
+#     in ISO 6709 sign-degrees-minutes-seconds format,
+#     either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
+#     first latitude (+ is north), then longitude (+ is east).
+# 3.  Timezone name used in value of TZ environment variable.
+#     Please see the theory.html file for how these names are chosen.
+#     If multiple timezones overlap a country, each has a row in the
+#     table, with each column 1 containing the country code.
+# 4.  Comments; present if and only if a country has multiple timezones.
+#
+# If a timezone covers multiple countries, the most-populous city is used,
+# and that country is listed first in column 1; any other countries
+# are listed alphabetically by country code.  The table is sorted
+# first by country code, then (if possible) by an order within the
+# country that (1) makes some geographical sense, and (2) puts the
+# most populous timezones first, where that does not contradict (1).
+#
+# This table is intended as an aid for users, to help them select timezones
+# appropriate for their practical needs.  It is not intended to take or
+# endorse any position on legal or territorial claims.
+#
+#country-
+#codes	coordinates	TZ	comments
+AD	+4230+00131	Europe/Andorra
+AE,OM	+2518+05518	Asia/Dubai
+AF	+3431+06912	Asia/Kabul
+AL	+4120+01950	Europe/Tirane
+AM	+4011+04430	Asia/Yerevan
+AQ	-6617+11031	Antarctica/Casey	Casey
+AQ	-6835+07758	Antarctica/Davis	Davis
+AQ	-6640+14001	Antarctica/DumontDUrville	Dumont-d'Urville
+AQ	-6736+06253	Antarctica/Mawson	Mawson
+AQ	-6448-06406	Antarctica/Palmer	Palmer
+AQ	-6734-06808	Antarctica/Rothera	Rothera
+AQ	-690022+0393524	Antarctica/Syowa	Syowa
+AQ	-720041+0023206	Antarctica/Troll	Troll
+AQ	-7824+10654	Antarctica/Vostok	Vostok
+AR	-3436-05827	America/Argentina/Buenos_Aires	Buenos Aires (BA, CF)
+AR	-3124-06411	America/Argentina/Cordoba	Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)
+AR	-2447-06525	America/Argentina/Salta	Salta (SA, LP, NQ, RN)
+AR	-2411-06518	America/Argentina/Jujuy	Jujuy (JY)
+AR	-2649-06513	America/Argentina/Tucuman	Tucumán (TM)
+AR	-2828-06547	America/Argentina/Catamarca	Catamarca (CT); Chubut (CH)
+AR	-2926-06651	America/Argentina/La_Rioja	La Rioja (LR)
+AR	-3132-06831	America/Argentina/San_Juan	San Juan (SJ)
+AR	-3253-06849	America/Argentina/Mendoza	Mendoza (MZ)
+AR	-3319-06621	America/Argentina/San_Luis	San Luis (SL)
+AR	-5138-06913	America/Argentina/Rio_Gallegos	Santa Cruz (SC)
+AR	-5448-06818	America/Argentina/Ushuaia	Tierra del Fuego (TF)
+AS,UM	-1416-17042	Pacific/Pago_Pago	Samoa, Midway
+AT	+4813+01620	Europe/Vienna
+AU	-3133+15905	Australia/Lord_Howe	Lord Howe Island
+AU	-5430+15857	Antarctica/Macquarie	Macquarie Island
+AU	-4253+14719	Australia/Hobart	Tasmania (most areas)
+AU	-3956+14352	Australia/Currie	Tasmania (King Island)
+AU	-3749+14458	Australia/Melbourne	Victoria
+AU	-3352+15113	Australia/Sydney	New South Wales (most areas)
+AU	-3157+14127	Australia/Broken_Hill	New South Wales (Yancowinna)
+AU	-2728+15302	Australia/Brisbane	Queensland (most areas)
+AU	-2016+14900	Australia/Lindeman	Queensland (Whitsunday Islands)
+AU	-3455+13835	Australia/Adelaide	South Australia
+AU	-1228+13050	Australia/Darwin	Northern Territory
+AU	-3157+11551	Australia/Perth	Western Australia (most areas)
+AU	-3143+12852	Australia/Eucla	Western Australia (Eucla)
+AZ	+4023+04951	Asia/Baku
+BB	+1306-05937	America/Barbados
+BD	+2343+09025	Asia/Dhaka
+BE	+5050+00420	Europe/Brussels
+BG	+4241+02319	Europe/Sofia
+BM	+3217-06446	Atlantic/Bermuda
+BN	+0456+11455	Asia/Brunei
+BO	-1630-06809	America/La_Paz
+BR	-0351-03225	America/Noronha	Atlantic islands
+BR	-0127-04829	America/Belem	Pará (east); Amapá
+BR	-0343-03830	America/Fortaleza	Brazil (northeast: MA, PI, CE, RN, PB)
+BR	-0803-03454	America/Recife	Pernambuco
+BR	-0712-04812	America/Araguaina	Tocantins
+BR	-0940-03543	America/Maceio	Alagoas, Sergipe
+BR	-1259-03831	America/Bahia	Bahia
+BR	-2332-04637	America/Sao_Paulo	Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)
+BR	-2027-05437	America/Campo_Grande	Mato Grosso do Sul
+BR	-1535-05605	America/Cuiaba	Mato Grosso
+BR	-0226-05452	America/Santarem	Pará (west)
+BR	-0846-06354	America/Porto_Velho	Rondônia
+BR	+0249-06040	America/Boa_Vista	Roraima
+BR	-0308-06001	America/Manaus	Amazonas (east)
+BR	-0640-06952	America/Eirunepe	Amazonas (west)
+BR	-0958-06748	America/Rio_Branco	Acre
+BS	+2505-07721	America/Nassau
+BT	+2728+08939	Asia/Thimphu
+BY	+5354+02734	Europe/Minsk
+BZ	+1730-08812	America/Belize
+CA	+4734-05243	America/St_Johns	Newfoundland; Labrador (southeast)
+CA	+4439-06336	America/Halifax	Atlantic - NS (most areas); PE
+CA	+4612-05957	America/Glace_Bay	Atlantic - NS (Cape Breton)
+CA	+4606-06447	America/Moncton	Atlantic - New Brunswick
+CA	+5320-06025	America/Goose_Bay	Atlantic - Labrador (most areas)
+CA	+5125-05707	America/Blanc-Sablon	AST - QC (Lower North Shore)
+CA	+4339-07923	America/Toronto	Eastern - ON, QC (most areas)
+CA	+4901-08816	America/Nipigon	Eastern - ON, QC (no DST 1967-73)
+CA	+4823-08915	America/Thunder_Bay	Eastern - ON (Thunder Bay)
+CA	+6344-06828	America/Iqaluit	Eastern - NU (most east areas)
+CA	+6608-06544	America/Pangnirtung	Eastern - NU (Pangnirtung)
+CA	+484531-0913718	America/Atikokan	EST - ON (Atikokan); NU (Coral H)
+CA	+4953-09709	America/Winnipeg	Central - ON (west); Manitoba
+CA	+4843-09434	America/Rainy_River	Central - ON (Rainy R, Ft Frances)
+CA	+744144-0944945	America/Resolute	Central - NU (Resolute)
+CA	+624900-0920459	America/Rankin_Inlet	Central - NU (central)
+CA	+5024-10439	America/Regina	CST - SK (most areas)
+CA	+5017-10750	America/Swift_Current	CST - SK (midwest)
+CA	+5333-11328	America/Edmonton	Mountain - AB; BC (E); SK (W)
+CA	+690650-1050310	America/Cambridge_Bay	Mountain - NU (west)
+CA	+6227-11421	America/Yellowknife	Mountain - NT (central)
+CA	+682059-1334300	America/Inuvik	Mountain - NT (west)
+CA	+4906-11631	America/Creston	MST - BC (Creston)
+CA	+5946-12014	America/Dawson_Creek	MST - BC (Dawson Cr, Ft St John)
+CA	+5848-12242	America/Fort_Nelson	MST - BC (Ft Nelson)
+CA	+4916-12307	America/Vancouver	Pacific - BC (most areas)
+CA	+6043-13503	America/Whitehorse	Pacific - Yukon (east)
+CA	+6404-13925	America/Dawson	Pacific - Yukon (west)
+CC	-1210+09655	Indian/Cocos
+CH,DE,LI	+4723+00832	Europe/Zurich	Swiss time
+CI,BF,GM,GN,ML,MR,SH,SL,SN,TG	+0519-00402	Africa/Abidjan
+CK	-2114-15946	Pacific/Rarotonga
+CL	-3327-07040	America/Santiago	Chile (most areas)
+CL	-5309-07055	America/Punta_Arenas	Region of Magallanes
+CL	-2709-10926	Pacific/Easter	Easter Island
+CN	+3114+12128	Asia/Shanghai	Beijing Time
+CN	+4348+08735	Asia/Urumqi	Xinjiang Time
+CO	+0436-07405	America/Bogota
+CR	+0956-08405	America/Costa_Rica
+CU	+2308-08222	America/Havana
+CV	+1455-02331	Atlantic/Cape_Verde
+CW,AW,BQ,SX	+1211-06900	America/Curacao
+CX	-1025+10543	Indian/Christmas
+CY	+3510+03322	Asia/Nicosia	Cyprus (most areas)
+CY	+3507+03357	Asia/Famagusta	Northern Cyprus
+CZ,SK	+5005+01426	Europe/Prague
+DE	+5230+01322	Europe/Berlin	Germany (most areas)
+DK	+5540+01235	Europe/Copenhagen
+DO	+1828-06954	America/Santo_Domingo
+DZ	+3647+00303	Africa/Algiers
+EC	-0210-07950	America/Guayaquil	Ecuador (mainland)
+EC	-0054-08936	Pacific/Galapagos	Galápagos Islands
+EE	+5925+02445	Europe/Tallinn
+EG	+3003+03115	Africa/Cairo
+EH	+2709-01312	Africa/El_Aaiun
+ES	+4024-00341	Europe/Madrid	Spain (mainland)
+ES	+3553-00519	Africa/Ceuta	Ceuta, Melilla
+ES	+2806-01524	Atlantic/Canary	Canary Islands
+FI,AX	+6010+02458	Europe/Helsinki
+FJ	-1808+17825	Pacific/Fiji
+FK	-5142-05751	Atlantic/Stanley
+FM	+0725+15147	Pacific/Chuuk	Chuuk/Truk, Yap
+FM	+0658+15813	Pacific/Pohnpei	Pohnpei/Ponape
+FM	+0519+16259	Pacific/Kosrae	Kosrae
+FO	+6201-00646	Atlantic/Faroe
+FR	+4852+00220	Europe/Paris
+GB,GG,IM,JE	+513030-0000731	Europe/London
+GE	+4143+04449	Asia/Tbilisi
+GF	+0456-05220	America/Cayenne
+GH	+0533-00013	Africa/Accra
+GI	+3608-00521	Europe/Gibraltar
+GL	+6411-05144	America/Nuuk	Greenland (most areas)
+GL	+7646-01840	America/Danmarkshavn	National Park (east coast)
+GL	+7029-02158	America/Scoresbysund	Scoresbysund/Ittoqqortoormiit
+GL	+7634-06847	America/Thule	Thule/Pituffik
+GR	+3758+02343	Europe/Athens
+GS	-5416-03632	Atlantic/South_Georgia
+GT	+1438-09031	America/Guatemala
+GU,MP	+1328+14445	Pacific/Guam
+GW	+1151-01535	Africa/Bissau
+GY	+0648-05810	America/Guyana
+HK	+2217+11409	Asia/Hong_Kong
+HN	+1406-08713	America/Tegucigalpa
+HT	+1832-07220	America/Port-au-Prince
+HU	+4730+01905	Europe/Budapest
+ID	-0610+10648	Asia/Jakarta	Java, Sumatra
+ID	-0002+10920	Asia/Pontianak	Borneo (west, central)
+ID	-0507+11924	Asia/Makassar	Borneo (east, south); Sulawesi/Celebes, Bali, Nusa Tengarra; Timor (west)
+ID	-0232+14042	Asia/Jayapura	New Guinea (West Papua / Irian Jaya); Malukus/Moluccas
+IE	+5320-00615	Europe/Dublin
+IL	+314650+0351326	Asia/Jerusalem
+IN	+2232+08822	Asia/Kolkata
+IO	-0720+07225	Indian/Chagos
+IQ	+3321+04425	Asia/Baghdad
+IR	+3540+05126	Asia/Tehran
+IS	+6409-02151	Atlantic/Reykjavik
+IT,SM,VA	+4154+01229	Europe/Rome
+JM	+175805-0764736	America/Jamaica
+JO	+3157+03556	Asia/Amman
+JP	+353916+1394441	Asia/Tokyo
+KE,DJ,ER,ET,KM,MG,SO,TZ,UG,YT	-0117+03649	Africa/Nairobi
+KG	+4254+07436	Asia/Bishkek
+KI	+0125+17300	Pacific/Tarawa	Gilbert Islands
+KI	-0308-17105	Pacific/Enderbury	Phoenix Islands
+KI	+0152-15720	Pacific/Kiritimati	Line Islands
+KP	+3901+12545	Asia/Pyongyang
+KR	+3733+12658	Asia/Seoul
+KZ	+4315+07657	Asia/Almaty	Kazakhstan (most areas)
+KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda/Kyzylorda/Kzyl-Orda
+KZ	+5312+06337	Asia/Qostanay	Qostanay/Kostanay/Kustanay
+KZ	+5017+05710	Asia/Aqtobe	Aqtöbe/Aktobe
+KZ	+4431+05016	Asia/Aqtau	Mangghystaū/Mankistau
+KZ	+4707+05156	Asia/Atyrau	Atyraū/Atirau/Gur'yev
+KZ	+5113+05121	Asia/Oral	West Kazakhstan
+LB	+3353+03530	Asia/Beirut
+LK	+0656+07951	Asia/Colombo
+LR	+0618-01047	Africa/Monrovia
+LT	+5441+02519	Europe/Vilnius
+LU	+4936+00609	Europe/Luxembourg
+LV	+5657+02406	Europe/Riga
+LY	+3254+01311	Africa/Tripoli
+MA	+3339-00735	Africa/Casablanca
+MC	+4342+00723	Europe/Monaco
+MD	+4700+02850	Europe/Chisinau
+MH	+0709+17112	Pacific/Majuro	Marshall Islands (most areas)
+MH	+0905+16720	Pacific/Kwajalein	Kwajalein
+MM	+1647+09610	Asia/Yangon
+MN	+4755+10653	Asia/Ulaanbaatar	Mongolia (most areas)
+MN	+4801+09139	Asia/Hovd	Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
+MN	+4804+11430	Asia/Choibalsan	Dornod, Sükhbaatar
+MO	+221150+1133230	Asia/Macau
+MQ	+1436-06105	America/Martinique
+MT	+3554+01431	Europe/Malta
+MU	-2010+05730	Indian/Mauritius
+MV	+0410+07330	Indian/Maldives
+MX	+1924-09909	America/Mexico_City	Central Time
+MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
+MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatán
+MX	+2540-10019	America/Monterrey	Central Time - Durango; Coahuila, Nuevo León, Tamaulipas (most areas)
+MX	+2550-09730	America/Matamoros	Central Time US - Coahuila, Nuevo León, Tamaulipas (US border)
+MX	+2313-10625	America/Mazatlan	Mountain Time - Baja California Sur, Nayarit, Sinaloa
+MX	+2838-10605	America/Chihuahua	Mountain Time - Chihuahua (most areas)
+MX	+2934-10425	America/Ojinaga	Mountain Time US - Chihuahua (US border)
+MX	+2904-11058	America/Hermosillo	Mountain Standard Time - Sonora
+MX	+3232-11701	America/Tijuana	Pacific Time US - Baja California
+MX	+2048-10515	America/Bahia_Banderas	Central Time - Bahía de Banderas
+MY	+0310+10142	Asia/Kuala_Lumpur	Malaysia (peninsula)
+MY	+0133+11020	Asia/Kuching	Sabah, Sarawak
+MZ,BI,BW,CD,MW,RW,ZM,ZW	-2558+03235	Africa/Maputo	Central Africa Time
+NA	-2234+01706	Africa/Windhoek
+NC	-2216+16627	Pacific/Noumea
+NF	-2903+16758	Pacific/Norfolk
+NG,AO,BJ,CD,CF,CG,CM,GA,GQ,NE	+0627+00324	Africa/Lagos	West Africa Time
+NI	+1209-08617	America/Managua
+NL	+5222+00454	Europe/Amsterdam
+NO,SJ	+5955+01045	Europe/Oslo
+NP	+2743+08519	Asia/Kathmandu
+NR	-0031+16655	Pacific/Nauru
+NU	-1901-16955	Pacific/Niue
+NZ,AQ	-3652+17446	Pacific/Auckland	New Zealand time
+NZ	-4357-17633	Pacific/Chatham	Chatham Islands
+PA,KY	+0858-07932	America/Panama
+PE	-1203-07703	America/Lima
+PF	-1732-14934	Pacific/Tahiti	Society Islands
+PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
+PF	-2308-13457	Pacific/Gambier	Gambier Islands
+PG	-0930+14710	Pacific/Port_Moresby	Papua New Guinea (most areas)
+PG	-0613+15534	Pacific/Bougainville	Bougainville
+PH	+1435+12100	Asia/Manila
+PK	+2452+06703	Asia/Karachi
+PL	+5215+02100	Europe/Warsaw
+PM	+4703-05620	America/Miquelon
+PN	-2504-13005	Pacific/Pitcairn
+PR	+182806-0660622	America/Puerto_Rico
+PS	+3130+03428	Asia/Gaza	Gaza Strip
+PS	+313200+0350542	Asia/Hebron	West Bank
+PT	+3843-00908	Europe/Lisbon	Portugal (mainland)
+PT	+3238-01654	Atlantic/Madeira	Madeira Islands
+PT	+3744-02540	Atlantic/Azores	Azores
+PW	+0720+13429	Pacific/Palau
+PY	-2516-05740	America/Asuncion
+QA,BH	+2517+05132	Asia/Qatar
+RE,TF	-2052+05528	Indian/Reunion	Réunion, Crozet, Scattered Islands
+RO	+4426+02606	Europe/Bucharest
+RS,BA,HR,ME,MK,SI	+4450+02030	Europe/Belgrade
+RU	+5443+02030	Europe/Kaliningrad	MSK-01 - Kaliningrad
+RU	+554521+0373704	Europe/Moscow	MSK+00 - Moscow area
+# Mention RU and UA alphabetically.  See "territorial claims" above.
+RU,UA	+4457+03406	Europe/Simferopol	Crimea
+RU	+5836+04939	Europe/Kirov	MSK+00 - Kirov
+RU	+4621+04803	Europe/Astrakhan	MSK+01 - Astrakhan
+RU	+4844+04425	Europe/Volgograd	MSK+01 - Volgograd
+RU	+5134+04602	Europe/Saratov	MSK+01 - Saratov
+RU	+5420+04824	Europe/Ulyanovsk	MSK+01 - Ulyanovsk
+RU	+5312+05009	Europe/Samara	MSK+01 - Samara, Udmurtia
+RU	+5651+06036	Asia/Yekaterinburg	MSK+02 - Urals
+RU	+5500+07324	Asia/Omsk	MSK+03 - Omsk
+RU	+5502+08255	Asia/Novosibirsk	MSK+04 - Novosibirsk
+RU	+5322+08345	Asia/Barnaul	MSK+04 - Altai
+RU	+5630+08458	Asia/Tomsk	MSK+04 - Tomsk
+RU	+5345+08707	Asia/Novokuznetsk	MSK+04 - Kemerovo
+RU	+5601+09250	Asia/Krasnoyarsk	MSK+04 - Krasnoyarsk area
+RU	+5216+10420	Asia/Irkutsk	MSK+05 - Irkutsk, Buryatia
+RU	+5203+11328	Asia/Chita	MSK+06 - Zabaykalsky
+RU	+6200+12940	Asia/Yakutsk	MSK+06 - Lena River
+RU	+623923+1353314	Asia/Khandyga	MSK+06 - Tomponsky, Ust-Maysky
+RU	+4310+13156	Asia/Vladivostok	MSK+07 - Amur River
+RU	+643337+1431336	Asia/Ust-Nera	MSK+07 - Oymyakonsky
+RU	+5934+15048	Asia/Magadan	MSK+08 - Magadan
+RU	+4658+14242	Asia/Sakhalin	MSK+08 - Sakhalin Island
+RU	+6728+15343	Asia/Srednekolymsk	MSK+08 - Sakha (E); North Kuril Is
+RU	+5301+15839	Asia/Kamchatka	MSK+09 - Kamchatka
+RU	+6445+17729	Asia/Anadyr	MSK+09 - Bering Sea
+SA,KW,YE	+2438+04643	Asia/Riyadh
+SB	-0932+16012	Pacific/Guadalcanal
+SC	-0440+05528	Indian/Mahe
+SD	+1536+03232	Africa/Khartoum
+SE	+5920+01803	Europe/Stockholm
+SG	+0117+10351	Asia/Singapore
+SR	+0550-05510	America/Paramaribo
+SS	+0451+03137	Africa/Juba
+ST	+0020+00644	Africa/Sao_Tome
+SV	+1342-08912	America/El_Salvador
+SY	+3330+03618	Asia/Damascus
+TC	+2128-07108	America/Grand_Turk
+TD	+1207+01503	Africa/Ndjamena
+TF	-492110+0701303	Indian/Kerguelen	Kerguelen, St Paul Island, Amsterdam Island
+TH,KH,LA,VN	+1345+10031	Asia/Bangkok	Indochina (most areas)
+TJ	+3835+06848	Asia/Dushanbe
+TK	-0922-17114	Pacific/Fakaofo
+TL	-0833+12535	Asia/Dili
+TM	+3757+05823	Asia/Ashgabat
+TN	+3648+01011	Africa/Tunis
+TO	-2110-17510	Pacific/Tongatapu
+TR	+4101+02858	Europe/Istanbul
+TT,AG,AI,BL,DM,GD,GP,KN,LC,MF,MS,VC,VG,VI	+1039-06131	America/Port_of_Spain
+TV	-0831+17913	Pacific/Funafuti
+TW	+2503+12130	Asia/Taipei
+UA	+5026+03031	Europe/Kiev	Ukraine (most areas)
+UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
+UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
+UM	+1917+16637	Pacific/Wake	Wake Island
+US	+404251-0740023	America/New_York	Eastern (most areas)
+US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
+US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
+US	+364947-0845057	America/Kentucky/Monticello	Eastern - KY (Wayne)
+US	+394606-0860929	America/Indiana/Indianapolis	Eastern - IN (most areas)
+US	+384038-0873143	America/Indiana/Vincennes	Eastern - IN (Da, Du, K, Mn)
+US	+410305-0863611	America/Indiana/Winamac	Eastern - IN (Pulaski)
+US	+382232-0862041	America/Indiana/Marengo	Eastern - IN (Crawford)
+US	+382931-0871643	America/Indiana/Petersburg	Eastern - IN (Pike)
+US	+384452-0850402	America/Indiana/Vevay	Eastern - IN (Switzerland)
+US	+415100-0873900	America/Chicago	Central (most areas)
+US	+375711-0864541	America/Indiana/Tell_City	Central - IN (Perry)
+US	+411745-0863730	America/Indiana/Knox	Central - IN (Starke)
+US	+450628-0873651	America/Menominee	Central - MI (Wisconsin border)
+US	+470659-1011757	America/North_Dakota/Center	Central - ND (Oliver)
+US	+465042-1012439	America/North_Dakota/New_Salem	Central - ND (Morton rural)
+US	+471551-1014640	America/North_Dakota/Beulah	Central - ND (Mercer)
+US	+394421-1045903	America/Denver	Mountain (most areas)
+US	+433649-1161209	America/Boise	Mountain - ID (south); OR (east)
+US	+332654-1120424	America/Phoenix	MST - Arizona (except Navajo)
+US	+340308-1181434	America/Los_Angeles	Pacific
+US	+611305-1495401	America/Anchorage	Alaska (most areas)
+US	+581807-1342511	America/Juneau	Alaska - Juneau area
+US	+571035-1351807	America/Sitka	Alaska - Sitka area
+US	+550737-1313435	America/Metlakatla	Alaska - Annette Island
+US	+593249-1394338	America/Yakutat	Alaska - Yakutat
+US	+643004-1652423	America/Nome	Alaska (west)
+US	+515248-1763929	America/Adak	Aleutian Islands
+US,UM	+211825-1575130	Pacific/Honolulu	Hawaii
+UY	-345433-0561245	America/Montevideo
+UZ	+3940+06648	Asia/Samarkand	Uzbekistan (west)
+UZ	+4120+06918	Asia/Tashkent	Uzbekistan (east)
+VE	+1030-06656	America/Caracas
+VN	+1045+10640	Asia/Ho_Chi_Minh	Vietnam (south)
+VU	-1740+16825	Pacific/Efate
+WF	-1318-17610	Pacific/Wallis
+WS	-1350-17144	Pacific/Apia
+ZA,LS,SZ	-2615+02800	Africa/Johannesburg
diff --git a/src/Makevars b/src/Makevars
index 26de1c59..95472744 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -9,7 +9,7 @@
 # These are required to turn off code that links against libcurl.
 # We embed our own time zone database directly so we don't need any of this.
 
-# -DUSE_OS_TZDB=0
+# -DUSE_BINARY_TZDB=0
 #
 # Using the time zone data base that comes with the OS can be MUCH faster
 # because it is pre-compiled. However, there are a few issues.
@@ -31,5 +31,6 @@ PKG_CXXFLAGS = \
 	-DINSTALL=dummy \
 	-DAUTO_DOWNLOAD=0 \
 	-DHAS_REMOTE_API=0 \
+	-DUSE_BINARY_TZDB=1 \
 	-DUSE_OS_TZDB=0 \
 	-DONLY_C_LOCALE=1
diff --git a/src/Makevars.win b/src/Makevars.win
index 1e7f7373..65b86e2b 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -11,5 +11,6 @@ PKG_CXXFLAGS = \
 	-DINSTALL=dummy \
 	-DAUTO_DOWNLOAD=0 \
 	-DHAS_REMOTE_API=0 \
+	-DUSE_BINARY_TZDB=0 \
 	-DUSE_OS_TZDB=0 \
 	-DONLY_C_LOCALE=1
diff --git a/src/cpp11.cpp b/src/cpp11.cpp
index 2bc7c367..5dfd26b2 100644
--- a/src/cpp11.cpp
+++ b/src/cpp11.cpp
@@ -308,6 +308,14 @@ extern "C" SEXP _clock_clock_set_install(SEXP path) {
     return R_NilValue;
   END_CPP11
 }
+// install.cpp
+void clock_set_tz_dir(const cpp11::strings& path);
+extern "C" SEXP _clock_clock_set_tz_dir(SEXP path) {
+  BEGIN_CPP11
+    clock_set_tz_dir(cpp11::as_cpp<cpp11::decay_t<const cpp11::strings&>>(path));
+    return R_NilValue;
+  END_CPP11
+}
 // iso-year-week-day.cpp
 void iso_year_week_day_check_range_cpp(const cpp11::integers& x, const cpp11::strings& component_string, const cpp11::strings& arg);
 extern "C" SEXP _clock_iso_year_week_day_check_range_cpp(SEXP x, SEXP component_string, SEXP arg) {
@@ -596,6 +604,7 @@ extern SEXP _clock_as_year_month_weekday_from_sys_time_cpp(SEXP, SEXP);
 extern SEXP _clock_as_year_quarter_day_from_sys_time_cpp(SEXP, SEXP, SEXP);
 extern SEXP _clock_as_zoned_sys_time_from_naive_time_cpp(SEXP, SEXP, SEXP, SEXP, SEXP);
 extern SEXP _clock_clock_set_install(SEXP);
+extern SEXP _clock_clock_set_tz_dir(SEXP);
 extern SEXP _clock_collect_iso_year_week_day_fields(SEXP, SEXP);
 extern SEXP _clock_collect_year_month_day_fields(SEXP, SEXP);
 extern SEXP _clock_collect_year_month_weekday_fields(SEXP, SEXP);
@@ -680,6 +689,7 @@ static const R_CallMethodDef CallEntries[] = {
     {"_clock_as_year_quarter_day_from_sys_time_cpp",           (DL_FUNC) &_clock_as_year_quarter_day_from_sys_time_cpp,            3},
     {"_clock_as_zoned_sys_time_from_naive_time_cpp",           (DL_FUNC) &_clock_as_zoned_sys_time_from_naive_time_cpp,            5},
     {"_clock_clock_set_install",                               (DL_FUNC) &_clock_clock_set_install,                                1},
+    {"_clock_clock_set_tz_dir",                                (DL_FUNC) &_clock_clock_set_tz_dir,                                 1},
     {"_clock_collect_iso_year_week_day_fields",                (DL_FUNC) &_clock_collect_iso_year_week_day_fields,                 2},
     {"_clock_collect_year_month_day_fields",                   (DL_FUNC) &_clock_collect_year_month_day_fields,                    2},
     {"_clock_collect_year_month_weekday_fields",               (DL_FUNC) &_clock_collect_year_month_weekday_fields,                2},
diff --git a/src/install.cpp b/src/install.cpp
index 21384cbd..78e613b8 100644
--- a/src/install.cpp
+++ b/src/install.cpp
@@ -2,10 +2,10 @@
 #include "utils.h"
 
 /*
- * This function won't do anything if `USE_OS_TZDB=1`. In that case, the date
+ * This function won't do anything if `USE_BINARY_TZDB=1`. In that case, the date
  * library will auto find the binary version of the TZDB on your computer,
  * but this doesn't work on Windows and the binary parser has some issues.
- * So instead we set `USE_OS_TZDB=0` in the Makevars so `set_install()` is
+ * So instead we set `USE_BINARY_TZDB=0` in the Makevars so `set_install()` is
  * always run.
  */
 [[cpp11::register]]
@@ -16,7 +16,20 @@ void clock_set_install(const cpp11::strings& path) {
 
   std::string string_path(path[0]);
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
   date::set_install(string_path);
 #endif
 }
+
+[[cpp11::register]]
+void clock_set_tz_dir(const cpp11::strings& path) {
+  if (path.size() != 1) {
+    clock_abort("Internal error: Time zone database installation path should have size 1.");
+  }
+
+  std::string string_path(path[0]);
+
+#if USE_BINARY_TZDB && !USE_OS_TZDB
+  date::set_tz_dir(string_path);
+#endif
+}
diff --git a/src/tz.cpp b/src/tz.cpp
index f853b07b..1773143d 100644
--- a/src/tz.cpp
+++ b/src/tz.cpp
@@ -92,7 +92,7 @@
 #  define TARGET_OS_SIMULATOR 0
 #endif
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 #  include <dirent.h>
 #endif
 #include <algorithm>
@@ -105,7 +105,7 @@
 #include <iostream>
 #include <iterator>
 #include <memory>
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 #  include <queue>
 #endif
 #include <sstream>
@@ -141,7 +141,7 @@
 #  endif  // HAS_REMOTE_API
 #else   // !_WIN32
 #  include <unistd.h>
-#  if !USE_OS_TZDB && !defined(INSTALL)
+#  if !USE_BINARY_TZDB && !defined(INSTALL)
 #    include <wordexp.h>
 #  endif
 #  include <limits.h>
@@ -180,7 +180,7 @@ static CONSTDATA char folder_delimiter = '/';
 #  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
 #endif  // defined(__GNUC__) && __GNUC__ < 5
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
 
 #  ifdef _WIN32
 #    ifndef WINRT
@@ -267,7 +267,7 @@ get_download_folder()
 
 #  endif  // !_WIN32
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 namespace date
 {
@@ -277,7 +277,7 @@ namespace date
 
 using namespace detail;
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
 
 static
 std::string&
@@ -326,7 +326,7 @@ get_download_gz_file(const std::string& version)
 }
 #endif  // HAS_REMOTE_API
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 // These can be used to reduce the range of the database to save memory
 CONSTDATA auto min_year = date::year::min();
@@ -335,13 +335,13 @@ CONSTDATA auto max_year = date::year::max();
 CONSTDATA auto min_day = date::January/1;
 CONSTDATA auto max_day = date::December/31;
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 
 CONSTCD14 const sys_seconds min_seconds = sys_days(min_year/min_day);
 
-#endif  // USE_OS_TZDB
+#endif  // USE_BINARY_TZDB
 
-#ifndef _WIN32
+#if USE_OS_TZDB
 
 static
 std::string
@@ -396,7 +396,33 @@ get_tz_dir()
     return tz_dir;
 }
 
-#endif
+#elif USE_BINARY_TZDB // !USE_OS_TZDB
+
+static
+std::string&
+access_tz_dir()
+{
+    static std::string tz_dir;
+    return tz_dir;
+}
+
+void
+set_tz_dir(const std::string& tz_dir)
+{
+    access_tz_dir() = tz_dir;
+}
+
+static
+const std::string&
+get_tz_dir()
+{
+    static const std::string& tz_dir = access_tz_dir();
+    if (tz_dir.empty())
+        throw std::runtime_error("set_tz_dir() must set a directory path before calling get_tz_dir().");
+    return tz_dir;
+}
+
+#endif // USE_OS_TZDB
 
 // +-------------------+
 // | End Configuration |
@@ -491,7 +517,7 @@ parse_month(std::istream& in)
     return static_cast<unsigned>(++m);
 }
 
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
 
 #ifdef _WIN32
 
@@ -1722,11 +1748,11 @@ detail::zonelet::zonelet(const zonelet& i)
 #endif
 }
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 // time_zone
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 
 time_zone::time_zone(const std::string& s, detail::undocumented)
     : name_(s)
@@ -2230,7 +2256,7 @@ leap_second::leap_second(const sys_seconds& s, detail::undocumented)
 {
 }
 
-#else  // !USE_OS_TZDB
+#else  // !USE_BINARY_TZDB
 
 time_zone::time_zone(const std::string& s, detail::undocumented)
     : adjusted_(new std::once_flag{})
@@ -2630,7 +2656,7 @@ operator<<(std::ostream& os, const time_zone& z)
     return os;
 }
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 std::ostream&
 operator<<(std::ostream& os, const leap_second& x)
@@ -2639,7 +2665,7 @@ operator<<(std::ostream& os, const leap_second& x)
     return os << x.date_ << "  +";
 }
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 
 static
 std::string
@@ -2661,7 +2687,7 @@ get_version()
         in >> version;
         return version;
     }
-    return version;
+    return "unknown";
 }
 
 static
@@ -2772,6 +2798,7 @@ init_tzdb()
                 strcmp(d->d_name, "iso3166.tab")  == 0      ||
                 strcmp(d->d_name, "right")        == 0      ||
                 strcmp(d->d_name, "+VERSION")     == 0      ||
+                strcmp(d->d_name, "version")      == 0      ||
                 strcmp(d->d_name, "zone.tab")     == 0      ||
                 strcmp(d->d_name, "zone1970.tab") == 0      ||
                 strcmp(d->d_name, "tzdata.zi")    == 0      ||
@@ -2804,7 +2831,7 @@ init_tzdb()
     return db;
 }
 
-#else  // !USE_OS_TZDB
+#else  // !USE_BINARY_TZDB
 
 // time_zone_link
 
@@ -3582,7 +3609,7 @@ reload_tzdb()
     return get_tzdb_list().front();
 }
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 const tzdb&
 get_tzdb()
@@ -3608,7 +3635,7 @@ tzdb::locate_zone(const std::string& tz_name) const
         });
     if (zi == zones.end() || zi->name() != tz_name)
     {
-#if !USE_OS_TZDB
+#if !USE_BINARY_TZDB
         auto li = std::lower_bound(links.begin(), links.end(), tz_name,
 #if HAS_STRING_VIEW
         [](const time_zone_link& z, const std::string_view& nm)
@@ -3628,7 +3655,7 @@ tzdb::locate_zone(const std::string& tz_name) const
             if (zi != zones.end() && zi->name() == li->target())
                 return &*zi;
         }
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
         throw std::runtime_error(std::string(tz_name) + " not found in timezone database");
     }
     return &*zi;
@@ -3644,7 +3671,7 @@ locate_zone(const std::string& tz_name)
     return get_tzdb().locate_zone(tz_name);
 }
 
-#if USE_OS_TZDB
+#if USE_BINARY_TZDB
 
 std::ostream&
 operator<<(std::ostream& os, const tzdb& db)
@@ -3658,7 +3685,7 @@ operator<<(std::ostream& os, const tzdb& db)
     return os;
 }
 
-#else  // !USE_OS_TZDB
+#else  // !USE_BINARY_TZDB
 
 std::ostream&
 operator<<(std::ostream& os, const tzdb& db)
@@ -3717,7 +3744,7 @@ operator<<(std::ostream& os, const tzdb& db)
     return os;
 }
 
-#endif  // !USE_OS_TZDB
+#endif  // !USE_BINARY_TZDB
 
 // -----------------------
 
@@ -3846,6 +3873,7 @@ tzdb::current_zone() const
             return locate_zone(extract_tz_name(rp));
         }
     }
+#if USE_OS_TZDB
     // On embedded systems e.g. buildroot with uclibc the timezone is linked
     // into /etc/TZ which is a symlink to path like this:
     // "/usr/share/zoneinfo/uclibc/America/Los_Angeles"
@@ -3874,6 +3902,7 @@ tzdb::current_zone() const
             return locate_zone(result);
         }
     }
+#endif // USE_OS_TZDB
     {
     // On some versions of some linux distro's (e.g. Ubuntu),
     // the current timezone might be in the first line of