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date/tz.h
Howard Hinnant c8d3cc14da Add zoned_time deduction guides
2017-07-06 20:49:53 -04:00

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#ifndef TZ_H
#define TZ_H
// The MIT License (MIT)
//
// Copyright (c) 2015, 2016, 2017 Howard Hinnant
// Copyright (c) 2017 Jiangang Zhuang
// Copyright (c) 2017 Aaron Bishop
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// Our apologies. When the previous paragraph was written, lowercase had not yet
// been invented (that would involve another several millennia of evolution).
// We did not mean to shout.
// Get more recent database at http://www.iana.org/time-zones
// The notion of "current timezone" is something the operating system is expected to "just
// know". How it knows this is system specific. It's often a value set by the user at OS
// installation time and recorded by the OS somewhere. On Linux and Mac systems the current
// timezone name is obtained by looking at the name or contents of a particular file on
// disk. On Windows the current timezone name comes from the registry. In either method,
// there is no guarantee that the "native" current timezone name obtained will match any
// of the "Standard" names in this library's "database". On Linux, the names usually do
// seem to match so mapping functions to map from native to "Standard" are typically not
// required. On Windows, the names are never "Standard" so mapping is always required.
// Technically any OS may use the mapping process but currently only Windows does use it.
#ifndef USE_OS_TZDB
# define USE_OS_TZDB 0
#endif
#ifndef HAS_REMOTE_API
# if USE_OS_TZDB == 0
# ifdef _WIN32
# define HAS_REMOTE_API 0
# else
# define HAS_REMOTE_API 1
# endif
# else // HAS_REMOTE_API makes no since when using the OS timezone database
# define HAS_REMOTE_API 0
# endif
#endif
static_assert(!(USE_OS_TZDB && HAS_REMOTE_API),
"USE_OS_TZDB and HAS_REMOTE_API can not be used together");
#ifndef AUTO_DOWNLOAD
# define AUTO_DOWNLOAD HAS_REMOTE_API
#endif
static_assert(HAS_REMOTE_API == 0 ? AUTO_DOWNLOAD == 0 : true,
"AUTO_DOWNLOAD can not be turned on without HAS_REMOTE_API");
#ifndef USE_SHELL_API
# define USE_SHELL_API 1
#endif
#if USE_OS_TZDB
# ifdef _WIN32
# error "USE_OS_TZDB can not be used on Windows"
# endif
# ifndef MISSING_LEAP_SECONDS
# ifdef __APPLE__
# define MISSING_LEAP_SECONDS 1
# else
# define MISSING_LEAP_SECONDS 0
# endif
# endif
#else
# define MISSING_LEAP_SECONDS 0
#endif
#ifndef HAS_DEDUCTION_GUIDES
# if __cplusplus >= 201703
# define HAS_DEDUCTION_GUIDES 1
# else
# define HAS_DEDUCTION_GUIDES 0
# endif
#endif // HAS_DEDUCTION_GUIDES
#include "date.h"
#if defined(_MSC_VER) && (_MSC_VER < 1900)
#include "tz_private.h"
#endif
#include <algorithm>
#include <cassert>
#include <chrono>
#include <istream>
#include <locale>
#include <memory>
#include <mutex>
#include <ostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>
#ifdef _WIN32
# ifdef DATE_BUILD_DLL
# define DATE_API __declspec(dllexport)
# elif defined(DATE_BUILD_LIB)
# define DATE_API
# else
# define DATE_API __declspec(dllimport)
# endif
#else
# define DATE_API
#endif
namespace date
{
enum class choose {earliest, latest};
namespace detail
{
struct undocumented;
}
class nonexistent_local_time
: public std::runtime_error
{
public:
template <class Duration>
nonexistent_local_time(local_time<Duration> tp, local_seconds first,
const std::string& first_abbrev, local_seconds last,
const std::string& last_abbrev, sys_seconds time_sys);
private:
template <class Duration>
static
std::string
make_msg(local_time<Duration> tp,
local_seconds first, const std::string& first_abbrev,
local_seconds last, const std::string& last_abbrev,
sys_seconds time_sys);
};
template <class Duration>
inline
nonexistent_local_time::nonexistent_local_time(local_time<Duration> tp,
local_seconds begin,
const std::string& first_abbrev,
local_seconds end,
const std::string& last_abbrev,
sys_seconds time_sys)
: std::runtime_error(make_msg(tp, begin, first_abbrev, end, last_abbrev, time_sys))
{}
template <class Duration>
std::string
nonexistent_local_time::make_msg(local_time<Duration> tp, local_seconds begin,
const std::string& first_abbrev, local_seconds end,
const std::string& last_abbrev, sys_seconds time_sys)
{
using namespace date;
std::ostringstream os;
os << tp << " is in a gap between\n"
<< begin << ' ' << first_abbrev << " and\n"
<< end << ' ' << last_abbrev
<< " which are both equivalent to\n"
<< time_sys << " UTC";
return os.str();
}
class ambiguous_local_time
: public std::runtime_error
{
public:
template <class Duration>
ambiguous_local_time(local_time<Duration> tp, std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev);
private:
template <class Duration>
static
std::string
make_msg(local_time<Duration> tp,
std::chrono::seconds first_offset, const std::string& first_abbrev,
std::chrono::seconds second_offset, const std::string& second_abbrev);
};
template <class Duration>
inline
ambiguous_local_time::ambiguous_local_time(
local_time<Duration> tp,
std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev)
: std::runtime_error(make_msg(tp, first_offset, first_abbrev, second_offset,
second_abbrev))
{}
template <class Duration>
std::string
ambiguous_local_time::make_msg(local_time<Duration> tp,
std::chrono::seconds first_offset,
const std::string& first_abbrev,
std::chrono::seconds second_offset,
const std::string& second_abbrev)
{
using namespace date;
std::ostringstream os;
os << tp << " is ambiguous. It could be\n"
<< tp << ' ' << first_abbrev << " == "
<< tp - first_offset << " UTC or\n"
<< tp << ' ' << second_abbrev << " == "
<< tp - second_offset << " UTC";
return os.str();
}
struct sys_info
{
sys_seconds begin;
sys_seconds end;
std::chrono::seconds offset;
std::chrono::minutes save;
std::string abbrev;
};
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const sys_info& r)
{
os << r.begin << '\n';
os << r.end << '\n';
os << make_time(r.offset) << "\n";
os << make_time(r.save) << "\n";
os << r.abbrev << '\n';
return os;
}
struct local_info
{
enum {unique, nonexistent, ambiguous} result;
sys_info first;
sys_info second;
};
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const local_info& r)
{
if (r.result == local_info::nonexistent)
os << "nonexistent between\n";
else if (r.result == local_info::ambiguous)
os << "ambiguous between\n";
os << r.first;
if (r.result != local_info::unique)
{
os << "and\n";
os << r.second;
}
return os;
}
class time_zone;
DATE_API const time_zone* locate_zone(const std::string& tz_name);
DATE_API const time_zone* current_zone();
template <class Duration>
class zoned_time
{
public:
using duration = typename std::common_type<Duration, std::chrono::seconds>::type;
private:
const time_zone* zone_;
sys_time<duration> tp_;
public:
zoned_time();
zoned_time(const sys_time<Duration>& st);
explicit zoned_time(const time_zone* z);
explicit zoned_time(const std::string& name);
template <class Duration2,
class = typename std::enable_if
<
std::is_convertible<sys_time<Duration2>,
sys_time<Duration>>::value
>::type>
zoned_time(const zoned_time<Duration2>& zt) NOEXCEPT;
zoned_time(const time_zone* z, const local_time<Duration>& tp);
zoned_time(const std::string& name, const local_time<Duration>& tp);
zoned_time(const char* name, const local_time<Duration>& tp);
zoned_time(const time_zone* z, const local_time<Duration>& tp, choose c);
zoned_time(const std::string& name, const local_time<Duration>& tp, choose c);
zoned_time(const char* name, const local_time<Duration>& tp, choose c);
zoned_time(const time_zone* z, const zoned_time<Duration>& zt);
zoned_time(const std::string& name, const zoned_time<Duration>& zt);
zoned_time(const char* name, const zoned_time<Duration>& zt);
zoned_time(const time_zone* z, const zoned_time<Duration>& zt, choose);
zoned_time(const std::string& name, const zoned_time<Duration>& zt, choose);
zoned_time(const char* name, const zoned_time<Duration>& zt, choose);
zoned_time(const time_zone* z, const sys_time<Duration>& st);
zoned_time(const std::string& name, const sys_time<Duration>& st);
zoned_time(const char* name, const sys_time<Duration>& st);
zoned_time& operator=(const sys_time<Duration>& st);
zoned_time& operator=(const local_time<Duration>& ut);
explicit operator sys_time<duration>() const;
explicit operator local_time<duration>() const;
const time_zone* get_time_zone() const;
local_time<duration> get_local_time() const;
sys_time<duration> get_sys_time() const;
sys_info get_info() const;
template <class Duration1, class Duration2>
friend
bool
operator==(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y);
template <class CharT, class Traits, class Duration1>
friend
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const zoned_time<Duration1>& t);
private:
template <class D> friend class zoned_time;
};
using zoned_seconds = zoned_time<std::chrono::seconds>;
#if HAS_DEDUCTION_GUIDES
template <class Duration>
zoned_time(sys_time<Duration>)
-> zoned_time<std::common_type_t<Duration, std::chrono::seconds>>;
template <class Zone, class Duration>
zoned_time(Zone, sys_time<Duration>)
-> zoned_time<std::common_type_t<Duration, std::chrono::seconds>>;
template <class Zone, class Duration>
zoned_time(Zone, local_time<Duration>, choose = choose::earliest)
-> zoned_time<std::common_type_t<Duration, std::chrono::seconds>>;
template <class Zone, class Duration>
zoned_time(Zone, zoned_time<Duration>, choose = choose::earliest)
-> zoned_time<std::common_type_t<Duration, std::chrono::seconds>>;
#endif // HAS_DEDUCTION_GUIDES
template <class Duration1, class Duration2>
inline
bool
operator==(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y)
{
return x.zone_ == y.zone_ && x.tp_ == y.tp_;
}
template <class Duration1, class Duration2>
inline
bool
operator!=(const zoned_time<Duration1>& x, const zoned_time<Duration2>& y)
{
return !(x == y);
}
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
namespace detail
{
# if USE_OS_TZDB
struct transition;
struct expanded_ttinfo;
# else // !USE_OS_TZDB
struct zonelet;
class Rule;
# endif // !USE_OS_TZDB
}
#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
class time_zone
{
private:
std::string name_;
#if USE_OS_TZDB
std::vector<detail::transition> transitions_;
std::vector<detail::expanded_ttinfo> ttinfos_;
#else // !USE_OS_TZDB
std::vector<detail::zonelet> zonelets_;
#endif // !USE_OS_TZDB
std::unique_ptr<std::once_flag> adjusted_;
public:
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
time_zone(time_zone&&) = default;
time_zone& operator=(time_zone&&) = default;
#else // defined(_MSC_VER) && (_MSC_VER < 1900)
time_zone(time_zone&& src);
time_zone& operator=(time_zone&& src);
#endif // defined(_MSC_VER) && (_MSC_VER < 1900)
DATE_API explicit time_zone(const std::string& s, detail::undocumented);
const std::string& name() const NOEXCEPT;
template <class Duration> sys_info get_info(sys_time<Duration> st) const;
template <class Duration> local_info get_info(local_time<Duration> tp) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(local_time<Duration> tp) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys(local_time<Duration> tp, choose z) const;
template <class Duration>
local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_local(sys_time<Duration> tp) const;
friend bool operator==(const time_zone& x, const time_zone& y) NOEXCEPT;
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
DATE_API void add(const std::string& s);
#endif // !USE_OS_TZDB
private:
DATE_API sys_info get_info_impl(sys_seconds tp) const;
DATE_API local_info get_info_impl(local_seconds tp) const;
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_impl(local_time<Duration> tp, choose z, std::false_type) const;
template <class Duration>
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
DATE_API void init() const;
DATE_API void init_impl();
DATE_API sys_info
load_sys_info(std::vector<detail::transition>::const_iterator i) const;
template <class TimeType>
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
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
};
#if defined(_MSC_VER) && (_MSC_VER < 1900)
inline
time_zone::time_zone(time_zone&& src)
: name_(std::move(src.name_))
, zonelets_(std::move(src.zonelets_))
, adjusted_(std::move(src.adjusted_))
{}
inline
time_zone&
time_zone::operator=(time_zone&& src)
{
name_ = std::move(src.name_);
zonelets_ = std::move(src.zonelets_);
adjusted_ = std::move(src.adjusted_);
return *this;
}
#endif // defined(_MSC_VER) && (_MSC_VER < 1900)
inline
const std::string&
time_zone::name() const NOEXCEPT
{
return name_;
}
template <class Duration>
inline
sys_info
time_zone::get_info(sys_time<Duration> st) const
{
using namespace std::chrono;
return get_info_impl(date::floor<seconds>(st));
}
template <class Duration>
inline
local_info
time_zone::get_info(local_time<Duration> tp) const
{
using namespace std::chrono;
return get_info_impl(date::floor<seconds>(tp));
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(local_time<Duration> tp) const
{
return to_sys_impl(tp, choose{}, std::true_type{});
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys(local_time<Duration> tp, choose z) const
{
return to_sys_impl(tp, z, std::false_type{});
}
template <class Duration>
inline
local_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_local(sys_time<Duration> tp) const
{
using LT = local_time<typename std::common_type<Duration, std::chrono::seconds>::type>;
auto i = get_info(tp);
return LT{(tp + i.offset).time_since_epoch()};
}
inline bool operator==(const time_zone& x, const time_zone& y) NOEXCEPT {return x.name_ == y.name_;}
inline bool operator< (const time_zone& x, const time_zone& y) NOEXCEPT {return x.name_ < y.name_;}
inline bool operator!=(const time_zone& x, const time_zone& y) NOEXCEPT {return !(x == y);}
inline bool operator> (const time_zone& x, const time_zone& y) NOEXCEPT {return y < x;}
inline bool operator<=(const time_zone& x, const time_zone& y) NOEXCEPT {return !(y < x);}
inline bool operator>=(const time_zone& x, const time_zone& y) NOEXCEPT {return !(x < y);}
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys_impl(local_time<Duration> tp, choose z, std::false_type) const
{
using namespace date;
using namespace std::chrono;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
{
return i.first.end;
}
else if (i.result == local_info::ambiguous)
{
if (z == choose::latest)
return sys_time<Duration>{tp.time_since_epoch()} - i.second.offset;
}
return sys_time<Duration>{tp.time_since_epoch()} - i.first.offset;
}
template <class Duration>
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
time_zone::to_sys_impl(local_time<Duration> tp, choose, std::true_type) const
{
using namespace date;
using namespace std::chrono;
auto i = get_info(tp);
if (i.result == local_info::nonexistent)
{
auto prev_end = local_seconds{i.first.end.time_since_epoch()} +
i.first.offset;
auto next_begin = local_seconds{i.second.begin.time_since_epoch()} +
i.second.offset;
throw nonexistent_local_time(tp, prev_end, i.first.abbrev,
next_begin, i.second.abbrev, i.first.end);
}
else if (i.result == local_info::ambiguous)
{
throw ambiguous_local_time(tp, i.first.offset, i.first.abbrev,
i.second.offset, i.second.abbrev);
}
return sys_time<Duration>{tp.time_since_epoch()} - i.first.offset;
}
#if !USE_OS_TZDB
class link
{
private:
std::string name_;
std::string target_;
public:
DATE_API explicit link(const std::string& s);
const std::string& name() const {return name_;}
const std::string& target() const {return target_;}
friend bool operator==(const link& x, const link& y) {return x.name_ == y.name_;}
friend bool operator< (const link& x, const link& y) {return x.name_ < y.name_;}
friend DATE_API std::ostream& operator<<(std::ostream& os, const link& x);
};
inline bool operator!=(const link& x, const link& y) {return !(x == y);}
inline bool operator> (const link& x, const link& y) {return y < x;}
inline bool operator<=(const link& x, const link& y) {return !(y < x);}
inline bool operator>=(const link& x, const link& y) {return !(x < y);}
#endif // !USE_OS_TZDB
#if !MISSING_LEAP_SECONDS
class leap
{
private:
sys_seconds date_;
public:
#if USE_OS_TZDB
DATE_API explicit leap(const sys_seconds& s, detail::undocumented);
#else
DATE_API explicit leap(const std::string& s, detail::undocumented);
#endif
sys_seconds date() const {return date_;}
friend bool operator==(const leap& x, const leap& y) {return x.date_ == y.date_;}
friend bool operator< (const leap& x, const leap& y) {return x.date_ < y.date_;}
template <class Duration>
friend
bool
operator==(const leap& x, const sys_time<Duration>& y)
{
return x.date_ == y;
}
template <class Duration>
friend
bool
operator< (const leap& x, const sys_time<Duration>& y)
{
return x.date_ < y;
}
template <class Duration>
friend
bool
operator< (const sys_time<Duration>& x, const leap& y)
{
return x < y.date_;
}
friend DATE_API std::ostream& operator<<(std::ostream& os, const leap& x);
};
inline bool operator!=(const leap& x, const leap& y) {return !(x == y);}
inline bool operator> (const leap& x, const leap& y) {return y < x;}
inline bool operator<=(const leap& x, const leap& y) {return !(y < x);}
inline bool operator>=(const leap& x, const leap& y) {return !(x < y);}
template <class Duration>
inline
bool
operator==(const sys_time<Duration>& x, const leap& y)
{
return y == x;
}
template <class Duration>
inline
bool
operator!=(const leap& x, const sys_time<Duration>& y)
{
return !(x == y);
}
template <class Duration>
inline
bool
operator!=(const sys_time<Duration>& x, const leap& y)
{
return !(x == y);
}
template <class Duration>
inline
bool
operator> (const leap& x, const sys_time<Duration>& y)
{
return y < x;
}
template <class Duration>
inline
bool
operator> (const sys_time<Duration>& x, const leap& y)
{
return y < x;
}
template <class Duration>
inline
bool
operator<=(const leap& x, const sys_time<Duration>& y)
{
return !(y < x);
}
template <class Duration>
inline
bool
operator<=(const sys_time<Duration>& x, const leap& y)
{
return !(y < x);
}
template <class Duration>
inline
bool
operator>=(const leap& x, const sys_time<Duration>& y)
{
return !(x < y);
}
template <class Duration>
inline
bool
operator>=(const sys_time<Duration>& x, const leap& y)
{
return !(x < y);
}
#endif // !MISSING_LEAP_SECONDS
#ifdef _WIN32
namespace detail
{
// The time zone mapping is modelled after this data file:
// http://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml
// and the field names match the element names from the mapZone element
// of windowsZones.xml.
// The website displays this file here:
// http://www.unicode.org/cldr/charts/latest/supplemental/zone_tzid.html
// The html view is sorted before being displayed but is otherwise the same
// There is a mapping between the os centric view (in this case windows)
// the html displays uses and the generic view the xml file.
// That mapping is this:
// display column "windows" -> xml field "other".
// display column "region" -> xml field "territory".
// display column "tzid" -> xml field "type".
// This structure uses the generic terminology because it could be
// used to to support other os/native name conversions, not just windows,
// and using the same generic names helps retain the connection to the
// origin of the data that we are using.
struct timezone_mapping
{
timezone_mapping(const char* other, const char* territory, const char* type)
: other(other), territory(territory), type(type)
{
}
timezone_mapping() = default;
std::string other;
std::string territory;
std::string type;
};
} // detail
#endif // _WIN32
struct TZ_DB
{
std::string version = "unknown";
std::vector<time_zone> zones;
#if !USE_OS_TZDB
std::vector<link> links;
#endif
#if !MISSING_LEAP_SECONDS
std::vector<leap> leaps;
#endif
#if !USE_OS_TZDB
std::vector<detail::Rule> rules;
#endif
#ifdef _WIN32
std::vector<detail::timezone_mapping> mappings;
#endif
TZ_DB() = default;
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
TZ_DB(TZ_DB&&) = default;
TZ_DB& operator=(TZ_DB&&) = default;
#else // defined(_MSC_VER) && (_MSC_VER < 1900)
TZ_DB(TZ_DB&& src)
: version(std::move(src.version))
, zones(std::move(src.zones))
, links(std::move(src.links))
, leaps(std::move(src.leaps))
, rules(std::move(src.rules))
, mappings(std::move(src.mappings))
{}
TZ_DB& operator=(TZ_DB&& src)
{
version = std::move(src.version);
zones = std::move(src.zones);
links = std::move(src.links);
leaps = std::move(src.leaps);
rules = std::move(src.rules);
mappings = std::move(src.mappings);
return *this;
}
#endif // defined(_MSC_VER) && (_MSC_VER < 1900)
};
DATE_API std::ostream&
operator<<(std::ostream& os, const TZ_DB& db);
DATE_API const TZ_DB& get_tzdb();
#if !USE_OS_TZDB
DATE_API const TZ_DB& reload_tzdb();
DATE_API void set_install(const std::string& install);
#endif // !USE_OS_TZDB
#if HAS_REMOTE_API
DATE_API std::string remote_version();
DATE_API bool remote_download(const std::string& version);
DATE_API bool remote_install(const std::string& version);
#endif
DATE_API const time_zone* locate_zone(const std::string& tz_name);
DATE_API const time_zone* current_zone();
// zoned_time
template <class Duration>
inline
zoned_time<Duration>::zoned_time()
: zone_(locate_zone("UTC"))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const sys_time<Duration>& st)
: zone_(locate_zone("UTC"))
, tp_(st)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z)
: zone_(z)
{assert(zone_ != nullptr);}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name)
: zoned_time(locate_zone(name))
{}
template <class Duration>
template <class Duration2, class>
inline
zoned_time<Duration>::zoned_time(const zoned_time<Duration2>& zt) NOEXCEPT
: zone_(zt.zone_)
, tp_(zt.tp_)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const local_time<Duration>& t)
: zone_(z)
, tp_(z->to_sys(t))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const local_time<Duration>& t)
: zoned_time(locate_zone(name), t)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const char* name, const local_time<Duration>& t)
: zoned_time(locate_zone(name), t)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const local_time<Duration>& t,
choose c)
: zone_(z)
, tp_(z->to_sys(t, c))
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const local_time<Duration>& t,
choose c)
: zoned_time(locate_zone(name), t, c)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const char* name, const local_time<Duration>& t,
choose c)
: zoned_time(locate_zone(name), t, c)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const zoned_time<Duration>& zt)
: zone_(z)
, tp_(zt.tp_)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const zoned_time<Duration>& zt)
: zoned_time(locate_zone(name), zt)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const char* name, const zoned_time<Duration>& zt)
: zoned_time(locate_zone(name), zt)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const zoned_time<Duration>& zt, choose)
: zoned_time(z, zt)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name,
const zoned_time<Duration>& zt, choose c)
: zoned_time(locate_zone(name), zt, c)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const char* name,
const zoned_time<Duration>& zt, choose c)
: zoned_time(locate_zone(name), zt, c)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const time_zone* z, const sys_time<Duration>& st)
: zone_(z)
, tp_(st)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const std::string& name, const sys_time<Duration>& st)
: zoned_time(locate_zone(name), st)
{}
template <class Duration>
inline
zoned_time<Duration>::zoned_time(const char* name, const sys_time<Duration>& st)
: zoned_time(locate_zone(name), st)
{}
template <class Duration>
inline
zoned_time<Duration>&
zoned_time<Duration>::operator=(const sys_time<Duration>& st)
{
tp_ = st;
return *this;
}
template <class Duration>
inline
zoned_time<Duration>&
zoned_time<Duration>::operator=(const local_time<Duration>& ut)
{
tp_ = zone_->to_sys(ut);
return *this;
}
template <class Duration>
inline
zoned_time<Duration>::operator local_time<zoned_time::duration>() const
{
return get_local_time();
}
template <class Duration>
inline
zoned_time<Duration>::operator sys_time<zoned_time::duration>() const
{
return get_sys_time();
}
template <class Duration>
inline
const time_zone*
zoned_time<Duration>::get_time_zone() const
{
return zone_;
}
template <class Duration>
inline
local_time<typename zoned_time<Duration>::duration>
zoned_time<Duration>::get_local_time() const
{
return zone_->to_local(tp_);
}
template <class Duration>
inline
sys_time<typename zoned_time<Duration>::duration>
zoned_time<Duration>::get_sys_time() const
{
return tp_;
}
template <class Duration>
inline
sys_info
zoned_time<Duration>::get_info() const
{
return zone_->get_info(tp_);
}
// make_zoned_time
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const sys_time<Duration>& tp)
{
return {tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const local_time<Duration>& tp)
{
return {zone, tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const local_time<Duration>& tp)
{
return {name, tp};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const local_time<Duration>& tp, choose c)
{
return {zone, tp, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const local_time<Duration>& tp, choose c)
{
return {name, tp, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const zoned_time<Duration>& zt)
{
return {zone, zt};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const zoned_time<Duration>& zt)
{
return {name, zt};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const zoned_time<Duration>& zt, choose c)
{
return {zone, zt, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const zoned_time<Duration>& zt, choose c)
{
return {name, zt, c};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const time_zone* zone, const sys_time<Duration>& st)
{
return {zone, st};
}
template <class Duration>
inline
zoned_time<typename std::common_type<Duration, std::chrono::seconds>::type>
make_zoned(const std::string& name, const sys_time<Duration>& st)
{
return {name, st};
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const zoned_time<Duration>& tp)
{
auto const info = tp.get_info();
return to_stream(os, fmt, tp.get_local_time(), &info.abbrev, &info.offset);
}
template <class CharT, class Traits, class Duration>
inline
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const zoned_time<Duration>& t)
{
const CharT fmt[] = {'%', 'F', ' ', '%', 'T', ' ', '%', 'Z', CharT{}};
return to_stream(os, fmt, t);
}
#if !MISSING_LEAP_SECONDS
class utc_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<utc_clock>;
static CONSTDATA bool is_steady = false;
static time_point now();
};
template <class Duration>
using utc_time = std::chrono::time_point<utc_clock, Duration>;
using utc_seconds = utc_time<std::chrono::seconds>;
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(const sys_time<Duration>& st)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto const& leaps = get_tzdb().leaps;
auto const lt = std::upper_bound(leaps.begin(), leaps.end(), st);
return utc_time<duration>{st.time_since_epoch() + seconds{lt-leaps.begin()}};
}
// Return pair<is_leap_second, seconds{number_of_leap_seconds_since_1970}>
// first is true if ut is during a leap second insertion, otherwise false.
// If ut is during a leap second insertion, that leap second is included in the count
template <class Duration>
std::pair<bool, std::chrono::seconds>
is_leap_second(date::utc_time<Duration> const& ut)
{
using namespace date;
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto const& leaps = get_tzdb().leaps;
auto tp = sys_time<duration>{ut.time_since_epoch()};
auto const lt = std::upper_bound(leaps.begin(), leaps.end(), tp);
auto ds = seconds{lt-leaps.begin()};
tp -= ds;
auto ls = false;
if (lt > leaps.begin())
{
if (tp < lt[-1])
{
if (tp >= lt[-1].date() - seconds{1})
ls = true;
else
--ds;
}
}
return {ls, ds};
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(const utc_time<Duration>& ut)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
auto ls = is_leap_second(ut);
auto tp = sys_time<duration>{ut.time_since_epoch() - ls.second};
if (ls.first)
tp = floor<seconds>(tp) + seconds{1} - duration{1};
return tp;
}
inline
utc_clock::time_point
utc_clock::now()
{
using namespace std::chrono;
return to_utc_time(system_clock::now());
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const utc_time<Duration>& t)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
const string abbrev("UTC");
CONSTDATA seconds offset{0};
auto ls = is_leap_second(t);
auto tp = sys_time<CT>{t.time_since_epoch() - ls.second};
auto const sd = floor<days>(tp);
year_month_day ymd = sd;
auto time = make_time(tp - sd);
time.seconds() += seconds{ls.first};
fields<CT> fds{ymd, time};
return to_stream(os, fmt, fds, &abbrev, &offset);
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const utc_time<Duration>& t)
{
const CharT fmt[] = {'%', 'F', ' ', '%', 'T', CharT{}};
return to_stream(os, fmt, t);
}
template <class Duration, class CharT, class Traits, class Alloc = std::allocator<CharT>>
std::basic_istream<CharT, Traits>&
from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
utc_time<Duration>& tp, std::basic_string<CharT, Traits, Alloc>* abbrev = nullptr,
std::chrono::minutes* offset = nullptr)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
minutes offset_local{};
auto offptr = offset ? offset : &offset_local;
fields<CT> fds{};
from_stream(is, fmt, fds, abbrev, offptr);
if (!fds.ymd.ok())
is.setstate(ios::failbit);
if (!is.fail())
{
bool is_60_sec = fds.tod.seconds() == seconds{60};
if (is_60_sec)
fds.tod.seconds() -= seconds{1};
auto tmp = to_utc_time(sys_days(fds.ymd) + (fds.tod.to_duration() - *offptr));
if (is_60_sec)
tmp += seconds{1};
if (is_60_sec != is_leap_second(tmp).first || !fds.tod.in_conventional_range())
{
is.setstate(ios::failbit);
return is;
}
tp = time_point_cast<Duration>(tmp);
}
return is;
}
// tai_clock
class tai_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<tai_clock>;
static const bool is_steady = false;
static time_point now() NOEXCEPT;
};
template <class Duration>
using tai_time = std::chrono::time_point<tai_clock, Duration>;
using tai_seconds = tai_time<std::chrono::seconds>;
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(const tai_time<Duration>& t) NOEXCEPT
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return utc_time<duration>{t.time_since_epoch()} -
(sys_days(year{1970}/jan/1) - sys_days(year{1958}/jan/1) + seconds{10});
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(const utc_time<Duration>& t) NOEXCEPT
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return tai_time<duration>{t.time_since_epoch()} +
(sys_days(year{1970}/jan/1) - sys_days(year{1958}/jan/1) + seconds{10});
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(const sys_time<Duration>& t)
{
return to_tai_time(to_utc_time(t));
}
inline
tai_clock::time_point
tai_clock::now() NOEXCEPT
{
using namespace std::chrono;
return to_tai_time(system_clock::now());
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const tai_time<Duration>& t)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
const string abbrev("TAI");
CONSTDATA seconds offset{0};
auto tp = sys_time<CT>{t.time_since_epoch()} -
(sys_days(year{1970}/jan/1) - sys_days(year{1958}/jan/1));
auto const sd = floor<days>(tp);
year_month_day ymd = sd;
auto time = make_time(tp - sd);
fields<CT> fds{ymd, time};
return to_stream(os, fmt, fds, &abbrev, &offset);
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const tai_time<Duration>& t)
{
const CharT fmt[] = {'%', 'F', ' ', '%', 'T', CharT{}};
return to_stream(os, fmt, t);
}
template <class Duration, class CharT, class Traits, class Alloc = std::allocator<CharT>>
std::basic_istream<CharT, Traits>&
from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
tai_time<Duration>& tp,
std::basic_string<CharT, Traits, Alloc>* abbrev = nullptr,
std::chrono::minutes* offset = nullptr)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
minutes offset_local{};
auto offptr = offset ? offset : &offset_local;
fields<CT> fds{};
from_stream(is, fmt, fds, abbrev, offptr);
if (!fds.ymd.ok() || !fds.tod.in_conventional_range())
is.setstate(ios::failbit);
if (!is.fail())
tp = tai_time<Duration>{duration_cast<Duration>(
(sys_days(fds.ymd) + fds.tod.to_duration() + (sys_days(year{1970}/jan/1) -
sys_days(year{1958}/jan/1)) - *offptr).time_since_epoch())};
return is;
}
// gps_clock
class gps_clock
{
public:
using duration = std::chrono::system_clock::duration;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<gps_clock>;
static const bool is_steady = false;
static time_point now() NOEXCEPT;
};
template <class Duration>
using gps_time = std::chrono::time_point<gps_clock, Duration>;
using gps_seconds = gps_time<std::chrono::seconds>;
template <class Duration>
inline
utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_utc_time(const gps_time<Duration>& t) NOEXCEPT
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return utc_time<duration>{t.time_since_epoch()} +
(sys_days(year{1980}/jan/sun[1]) - sys_days(year{1970}/jan/1) + seconds{9});
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(const utc_time<Duration>& t)
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return gps_time<duration>{t.time_since_epoch()} -
(sys_days(year{1980}/jan/sun[1]) - sys_days(year{1970}/jan/1) + seconds{9});
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(const sys_time<Duration>& t)
{
return to_gps_time(to_utc_time(t));
}
inline
gps_clock::time_point
gps_clock::now() NOEXCEPT
{
using namespace std::chrono;
return to_gps_time(system_clock::now());
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const gps_time<Duration>& t)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
const string abbrev("GPS");
CONSTDATA seconds offset{0};
auto tp = sys_time<CT>{t.time_since_epoch()} +
(sys_days(year{1980}/jan/sun[1]) - sys_days(year{1970}/jan/1));
auto const sd = floor<days>(tp);
year_month_day ymd = sd;
auto time = make_time(tp - sd);
fields<CT> fds{ymd, time};
return to_stream(os, fmt, fds, &abbrev, &offset);
}
template <class CharT, class Traits, class Duration>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os, const gps_time<Duration>& t)
{
const CharT fmt[] = {'%', 'F', ' ', '%', 'T', CharT{}};
return to_stream(os, fmt, t);
}
template <class Duration, class CharT, class Traits, class Alloc = std::allocator<CharT>>
std::basic_istream<CharT, Traits>&
from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
gps_time<Duration>& tp,
std::basic_string<CharT, Traits, Alloc>* abbrev = nullptr,
std::chrono::minutes* offset = nullptr)
{
using namespace std;
using namespace std::chrono;
using CT = typename common_type<Duration, seconds>::type;
minutes offset_local{};
auto offptr = offset ? offset : &offset_local;
fields<CT> fds{};
from_stream(is, fmt, fds, abbrev, offptr);
if (!fds.ymd.ok() || !fds.tod.in_conventional_range())
is.setstate(ios::failbit);
if (!is.fail())
tp = gps_time<Duration>{duration_cast<Duration>(
(sys_days(fds.ymd) + fds.tod.to_duration() -
(sys_days(year{1980}/jan/sun[1]) -
sys_days(year{1970}/jan/1)) - *offptr).time_since_epoch())};
return is;
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(const tai_time<Duration>& t)
{
return to_sys_time(to_utc_time(t));
}
template <class Duration>
inline
sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_sys_time(const gps_time<Duration>& t)
{
return to_sys_time(to_utc_time(t));
}
template <class Duration>
inline
tai_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_tai_time(const gps_time<Duration>& t) NOEXCEPT
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return tai_time<duration>{t.time_since_epoch()} +
(sys_days(year{1980}/jan/sun[1]) - sys_days(year{1958}/jan/1) + seconds{19});
}
template <class Duration>
inline
gps_time<typename std::common_type<Duration, std::chrono::seconds>::type>
to_gps_time(const tai_time<Duration>& t) NOEXCEPT
{
using namespace std::chrono;
using duration = typename std::common_type<Duration, seconds>::type;
return gps_time<duration>{t.time_since_epoch()} -
(sys_days(year{1980}/jan/sun[1]) - sys_days(year{1958}/jan/1) + seconds{19});
}
#endif // !MISSING_LEAP_SECONDS
} // namespace date
#endif // TZ_H
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