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gnucash/libgnucash/engine/gnc-datetime.cpp

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/********************************************************************\
* gnc-datetime.cpp -- Date and Time classes for GnuCash *
* *
* Copyright 2015 John Ralls <jralls@ceridwen.us> *
* *
* This program 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 2 of *
* the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License*
* along with this program; if not, contact: *
* *
* Free Software Foundation Voice: +1-617-542-5942 *
* 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652 *
* Boston, MA 02110-1301, USA gnu@gnu.org *
* *
\********************************************************************/
#include <config.h>
#include "platform.h"
#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/local_time/local_time.hpp>
#include <boost/locale.hpp>
#include <boost/regex.hpp>
#include <libintl.h>
#include <locale.h>
#include <map>
#include <memory>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#ifdef __MINGW32__
#include <codecvt>
#endif
#include <gnc-locale-utils.hpp>
#include "gnc-timezone.hpp"
#include "gnc-datetime.hpp"
#define N_(string) string //So that xgettext will find it
using PTZ = boost::local_time::posix_time_zone;
using Date = boost::gregorian::date;
using Month = boost::gregorian::greg_month;
using PTime = boost::posix_time::ptime;
using LDT = boost::local_time::local_date_time;
using Duration = boost::posix_time::time_duration;
using LDTBase = boost::local_time::local_date_time_base<PTime, boost::date_time::time_zone_base<PTime, char>>;
using boost::date_time::not_a_date_time;
using time64 = int64_t;
static const TimeZoneProvider ltzp;
static const TimeZoneProvider* tzp = &ltzp;
// For converting to/from POSIX time.
static const PTime unix_epoch (Date(1970, boost::gregorian::Jan, 1),
boost::posix_time::seconds(0));
static const TZ_Ptr utc_zone(new boost::local_time::posix_time_zone("UTC-0"));
/* Backdoor to enable unittests to temporarily override the timezone: */
void _set_tzp(TimeZoneProvider& tz);
void _reset_tzp();
/* To ensure things aren't overly screwed up by setting the nanosecond clock for boost::date_time. Don't do it, though, it doesn't get us anything and slows down the date/time library. */
#ifndef BOOST_DATE_TIME_HAS_NANOSECONDS
static constexpr auto ticks_per_second = INT64_C(1000000);
#else
static constexpr auto ticks_per_second = INT64_C(1000000000);
#endif
/* Vector of date formats understood by gnucash and corresponding regex
* to parse each from an external source
* Note: while the format names are using a "-" as separator, the
* regexes will accept any of "-/.' " and will also work for dates
* without separators.
*/
const std::vector<GncDateFormat> GncDate::c_formats ({
GncDateFormat {
N_("y-m-d"),
"(?:" // either y-m-d
"(?<YEAR>[0-9]+)[-/.' ]+"
"(?<MONTH>[0-9]+)[-/.' ]+"
"(?<DAY>[0-9]+)"
"|" // or CCYYMMDD
"(?<YEAR>[0-9]{4})"
"(?<MONTH>[0-9]{2})"
"(?<DAY>[0-9]{2})"
")"
},
GncDateFormat {
N_("d-m-y"),
"(?:" // either d-m-y
"(?<DAY>[0-9]+)[-/.' ]+"
"(?<MONTH>[0-9]+)[-/.' ]+"
"(?<YEAR>[0-9]+)"
"|" // or DDMMCCYY
"(?<DAY>[0-9]{2})"
"(?<MONTH>[0-9]{2})"
"(?<YEAR>[0-9]{4})"
")"
},
GncDateFormat {
N_("m-d-y"),
"(?:" // either m-d-y
"(?<MONTH>[0-9]+)[-/.' ]+"
"(?<DAY>[0-9]+)[-/.' ]+"
"(?<YEAR>[0-9]+)"
"|" // or MMDDCCYY
"(?<MONTH>[0-9]{2})"
"(?<DAY>[0-9]{2})"
"(?<YEAR>[0-9]{4})"
")"
},
// Note year is still checked for in the regexes below
// This is to be able to raise an error if one is found for a yearless date format
GncDateFormat {
(N_("d-m")),
"(?:" // either d-m(-y)
"(?<DAY>[0-9]+)[-/.' ]+"
"(?<MONTH>[0-9]+)(?:[-/.' ]+"
"(?<YEAR>[0-9]+))?"
"|" // or DDMM(CCYY)
"(?<DAY>[0-9]{2})"
"(?<MONTH>[0-9]{2})"
"(?<YEAR>[0-9]+)?"
")"
},
GncDateFormat {
(N_("m-d")),
"(?:" // either m-d(-y)
"(?<MONTH>[0-9]+)[-/.' ]+"
"(?<DAY>[0-9]+)(?:[-/.' ]+"
"(?<YEAR>[0-9]+))?"
"|" // or MMDD(CCYY)
"(?<MONTH>[0-9]{2})"
"(?<DAY>[0-9]{2})"
"(?<YEAR>[0-9]+)?"
")"
}
});
/** Private implementation of GncDateTime. See the documentation for that class.
*/
static LDT
LDT_from_unix_local(const time64 time)
{
try
{
PTime temp(unix_epoch.date(),
boost::posix_time::hours(time / 3600) +
boost::posix_time::seconds(time % 3600));
auto tz = tzp->get(temp.date().year());
return LDT(temp, tz);
}
catch(boost::gregorian::bad_year&)
{
throw(std::invalid_argument("Time value is outside the supported year range."));
}
}
/* If a date-time falls in a DST transition the LDT constructor will
* fail because either the date-time doesn't exist (when starting DST
* because the transition skips an hour) or is ambiguous (when ending
* because the transition hour is repeated). We try again an hour
* later to be outside the DST transition. When starting DST that's
* now the correct time but at the end of DST we need to set the
* returned time back an hour.
*/
static LDT
LDT_with_pushup(const Date& tdate, const Duration& tdur, const TZ_Ptr tz,
bool putback)
{
static const boost::posix_time::hours pushup{1};
LDT ldt{tdate, tdur + pushup, tz, LDTBase::NOT_DATE_TIME_ON_ERROR};
if (ldt.is_special())
{
std::string error{"Couldn't create a valid datetime at "};
error += to_simple_string(tdate) + " ";
error += to_simple_string(tdur) + " TZ ";
error += tz->std_zone_abbrev();
throw(std::invalid_argument{error});
}
if (putback)
ldt -= pushup;
return ldt;
}
static LDT
LDT_from_date_time(const Date& tdate, const Duration& tdur, const TZ_Ptr tz)
{
try
{
LDT ldt(tdate, tdur, tz, LDTBase::EXCEPTION_ON_ERROR);
return ldt;
}
catch (const boost::local_time::time_label_invalid& err)
{
return LDT_with_pushup(tdate, tdur, tz, false);
}
catch (const boost::local_time::ambiguous_result& err)
{
return LDT_with_pushup(tdate, tdur, tz, true);
}
catch(boost::gregorian::bad_year&)
{
throw(std::invalid_argument("Time value is outside the supported year range."));
}
}
static LDT
LDT_from_date_daypart(const Date& date, DayPart part, const TZ_Ptr tz)
{
using hours = boost::posix_time::hours;
static const Duration day_begin{0, 0, 0};
static const Duration day_neutral{10, 59, 0};
static const Duration day_end{23, 59, 59};
switch (part)
{
case DayPart::start:
return LDT_from_date_time(date, day_begin, tz);
case DayPart::end:
return LDT_from_date_time(date, day_end, tz);
default: // To stop gcc from emitting a control reaches end of non-void function.
case DayPart::neutral:
PTime pt{date, day_neutral};
LDT lt{pt, tz};
auto offset = lt.local_time() - lt.utc_time();
if (offset < hours(-10))
lt -= hours(offset.hours() + 10);
if (offset > hours(13))
lt += hours(13 - offset.hours());
return lt;
}
}
static LDT
LDT_from_struct_tm(const struct tm tm)
{
try
{
Date tdate{boost::gregorian::date_from_tm(tm)};
Duration tdur{boost::posix_time::time_duration(tm.tm_hour, tm.tm_min,
tm.tm_sec, 0)};
TZ_Ptr tz{tzp->get(tdate.year())};
return LDT_from_date_time(tdate, tdur, tz);
}
catch(const boost::gregorian::bad_year&)
{
throw(std::invalid_argument{"Time value is outside the supported year range."});
}
}
void
_set_tzp(TimeZoneProvider& new_tzp)
{
tzp = &new_tzp;
}
void
_reset_tzp()
{
tzp = &ltzp;
}
class GncDateTimeImpl
{
public:
GncDateTimeImpl() : m_time(boost::local_time::local_sec_clock::local_time(tzp->get(boost::gregorian::day_clock::local_day().year()))) {}
GncDateTimeImpl(const time64 time) : m_time(LDT_from_unix_local(time)) {}
GncDateTimeImpl(const struct tm tm) : m_time(LDT_from_struct_tm(tm)) {}
GncDateTimeImpl(const GncDateImpl& date, DayPart part = DayPart::neutral);
GncDateTimeImpl(std::string str);
GncDateTimeImpl(PTime&& pt) : m_time(pt, tzp->get(pt.date().year())) {}
GncDateTimeImpl(LDT&& ldt) : m_time(ldt) {}
operator time64() const;
operator struct tm() const;
void now() { m_time = boost::local_time::local_sec_clock::local_time(tzp->get(boost::gregorian::day_clock::local_day().year())); }
long offset() const;
struct tm utc_tm() const { return to_tm(m_time.utc_time()); }
std::unique_ptr<GncDateImpl> date() const;
std::string format(const char* format) const;
std::string format_zulu(const char* format) const;
std::string format_iso8601() const;
static std::string timestamp();
private:
LDT m_time;
};
/** Private implementation of GncDate. See the documentation for that class.
*/
class GncDateImpl
{
public:
GncDateImpl(): m_greg(boost::gregorian::day_clock::local_day()) {}
GncDateImpl(const int year, const int month, const int day) :
m_greg(year, static_cast<Month>(month), day) {}
GncDateImpl(Date d) : m_greg(d) {}
GncDateImpl(const std::string str, const std::string fmt);
void today() { m_greg = boost::gregorian::day_clock::local_day(); }
gnc_ymd year_month_day() const;
std::string format(const char* format) const;
std::string format_zulu(const char* format) const {
return this->format(format);
}
private:
Date m_greg;
friend GncDateTimeImpl::GncDateTimeImpl(const GncDateImpl&, DayPart);
friend bool operator<(const GncDateImpl&, const GncDateImpl&);
friend bool operator>(const GncDateImpl&, const GncDateImpl&);
friend bool operator==(const GncDateImpl&, const GncDateImpl&);
friend bool operator<=(const GncDateImpl&, const GncDateImpl&);
friend bool operator>=(const GncDateImpl&, const GncDateImpl&);
friend bool operator!=(const GncDateImpl&, const GncDateImpl&);
};
/* Needs to be separately defined so that the friend decl can grant
* access to date.m_greg.
*/
GncDateTimeImpl::GncDateTimeImpl(const GncDateImpl& date, DayPart part) :
m_time{LDT_from_date_daypart(date.m_greg, part,
tzp->get(date.m_greg.year()))} {}
/* Member function definitions for GncDateTimeImpl.
*/
static TZ_Ptr
tz_from_string(std::string str)
{
if (str.empty()) return utc_zone;
std::string tzstr = "XXX" + str;
if (tzstr.length() > 6 && tzstr[6] != ':') //6 for XXXsHH, s is + or -
tzstr.insert(6, ":");
if (tzstr.length() > 9 && tzstr[9] != ':') //9 for XXXsHH:MM
{
tzstr.insert(9, ":");
}
return TZ_Ptr(new PTZ(tzstr));
}
GncDateTimeImpl::GncDateTimeImpl(std::string str) :
m_time(unix_epoch, utc_zone)
{
if (str.empty()) return;
TZ_Ptr tzptr;
try
{
static const boost::regex delim_iso("^(\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}(?:\\.\\d{0,9})?)\\s*([+-]\\d{2}(?::?\\d{2})?)?$");
static const boost::regex non_delim("^(\\d{14}(?:\\.\\d{0,9})?)\\s*([+-]\\d{2}\\s*(:?\\d{2})?)?$");
PTime pdt;
boost::smatch sm;
if (regex_match(str, sm, non_delim))
{
std::string time_str(sm[1]);
time_str.insert(8, "T");
pdt = boost::posix_time::from_iso_string(time_str);
}
else if (regex_match(str, sm, delim_iso))
{
pdt = boost::posix_time::time_from_string(sm[1]);
}
else
{
throw(std::invalid_argument("The date string was not formatted in a way that GncDateTime(std::string) knows how to parse."));
}
std::string tzstr("");
if (sm[2].matched)
tzstr += sm[2];
tzptr = tz_from_string(tzstr);
m_time = LDT_from_date_time(pdt.date(), pdt.time_of_day(), tzptr);
}
catch(boost::gregorian::bad_year&)
{
throw(std::invalid_argument("The date string was outside of the supported year range."));
}
/* Bug 767824: A GLib bug in parsing the UTC timezone on Windows may have
* created a bogus timezone of a random number of minutes. Since there are
* no fractional-hour timezones around the prime meridian we can safely
* check for this in files by resetting to UTC if there's a
* less-than-an-hour offset.
*/
auto offset = tzptr->base_utc_offset().seconds();
if (offset != 0 && std::abs(offset) < 3600)
m_time = m_time.local_time_in(utc_zone);
}
GncDateTimeImpl::operator time64() const
{
auto duration = m_time.utc_time() - unix_epoch;
auto secs = duration.ticks();
secs /= ticks_per_second;
return secs;
}
GncDateTimeImpl::operator struct tm() const
{
struct tm time = to_tm(m_time);
#if HAVE_STRUCT_TM_GMTOFF
time.tm_gmtoff = offset();
#endif
return time;
}
long
GncDateTimeImpl::offset() const
{
auto offset = m_time.local_time() - m_time.utc_time();
return offset.total_seconds();
}
std::unique_ptr<GncDateImpl>
GncDateTimeImpl::date() const
{
return std::unique_ptr<GncDateImpl>(new GncDateImpl(m_time.local_time().date()));
}
/* The 'O', 'E', and '-' format modifiers are not supported by
* boost's output facets. Remove them.
*/
static inline std::string
normalize_format (const std::string& format)
{
bool is_pct = false;
std::string normalized;
std::remove_copy_if(
format.begin(), format.end(), back_inserter(normalized),
[&is_pct](char e){
bool r = (is_pct && (e == 'E' || e == 'O' || e == '-'));
is_pct = e == '%';
return r;
});
return normalized;
}
#ifdef __MINGW32__
constexpr size_t DATEBUFLEN = 100;
static std::string
win_date_format(std::string format, struct tm tm)
{
wchar_t buf[DATEBUFLEN];
memset(buf, 0, DATEBUFLEN);
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t> conv;
auto numchars = wcsftime(buf, DATEBUFLEN - 1, conv.from_bytes(format).c_str(), &tm);
return conv.to_bytes(buf);
}
/* Microsoft's strftime uses the time zone flags differently from
* boost::date_time so we need to handle any before passing the
* format string to strftime.
*/
inline std::string
win_format_tz_abbrev (std::string format, TZ_Ptr tz, bool is_dst)
{
size_t pos = format.find("%z");
if (pos != std::string::npos)
{
auto tzabbr = tz->has_dst() && is_dst ? tz->dst_zone_abbrev() :
tz->std_zone_abbrev();
format.replace(pos, 2, tzabbr);
}
return format;
}
inline std::string
win_format_tz_name (std::string format, TZ_Ptr tz, bool is_dst)
{
size_t pos = format.find("%Z");
if (pos != std::string::npos)
{
auto tzname = tz->has_dst() && is_dst ? tz->dst_zone_name() :
tz->std_zone_name();
format.replace(pos, 2, tzname);
}
return format;
}
inline std::string
win_format_tz_posix (std::string format, TZ_Ptr tz)
{
size_t pos = format.find("%ZP");
if (pos != std::string::npos)
format.replace(pos, 2, tz->to_posix_string());
return format;
}
#endif
std::string
GncDateTimeImpl::format(const char* format) const
{
#ifdef __MINGW32__
auto tz = m_time.zone();
auto tm = static_cast<struct tm>(*this);
auto sformat = win_format_tz_abbrev(format, tz, tm.tm_isdst);
sformat = win_format_tz_name(sformat, tz, tm.tm_isdst);
sformat = win_format_tz_posix(sformat, tz);
return win_date_format(sformat, tm);
#else
using Facet = boost::local_time::local_time_facet;
auto output_facet(new Facet(normalize_format(format).c_str()));
std::stringstream ss;
ss.imbue(std::locale(gnc_get_locale(), output_facet));
ss << m_time;
return ss.str();
#endif
}
std::string
GncDateTimeImpl::format_zulu(const char* format) const
{
#ifdef __MINGW32__
auto tz = m_time.zone();
auto tm = static_cast<struct tm>(*this);
auto sformat = win_format_tz_abbrev(format, tz, tm.tm_isdst);
sformat = win_format_tz_name(sformat, tz, tm.tm_isdst);
sformat = win_format_tz_posix(sformat, tz);
return win_date_format(sformat, utc_tm());
#else
using Facet = boost::local_time::local_time_facet;
auto zulu_time = LDT{m_time.utc_time(), utc_zone};
auto output_facet(new Facet(normalize_format(format).c_str()));
std::stringstream ss;
ss.imbue(std::locale(gnc_get_locale(), output_facet));
ss << zulu_time;
return ss.str();
#endif
}
std::string
GncDateTimeImpl::format_iso8601() const
{
auto str = boost::posix_time::to_iso_extended_string(m_time.utc_time());
str[10] = ' ';
return str.substr(0, 19);
}
std::string
GncDateTimeImpl::timestamp()
{
GncDateTimeImpl gdt;
auto str = boost::posix_time::to_iso_string(gdt.m_time.local_time());
return str.substr(0, 8) + str.substr(9, 15);
}
/* Member function definitions for GncDateImpl.
*/
GncDateImpl::GncDateImpl(const std::string str, const std::string fmt) :
m_greg(boost::gregorian::day_clock::local_day()) /* Temporarily initialized to today, will be used and adjusted in the code below */
{
auto iter = std::find_if(GncDate::c_formats.cbegin(), GncDate::c_formats.cend(),
[&fmt](const GncDateFormat& v){ return (v.m_fmt == fmt); } );
if (iter == GncDate::c_formats.cend())
throw std::invalid_argument(N_("Unknown date format specifier passed as argument."));
boost::regex r(iter->m_re);
boost::smatch what;
if(!boost::regex_search(str, what, r)) // regex didn't find a match
throw std::invalid_argument (N_("Value can't be parsed into a date using the selected date format."));
// Bail out if a year was found with a yearless format specifier
auto fmt_has_year = (fmt.find('y') != std::string::npos);
if (!fmt_has_year && (what.length("YEAR") != 0))
throw std::invalid_argument (N_("Value appears to contain a year while the selected format forbids this."));
int year;
if (fmt_has_year)
{
/* The input dates have a year, so use that one */
year = std::stoi (what.str("YEAR"));
/* We assume two-digit years to be in the range 1969 - 2068. */
if (year < 69)
year += 2000;
else if (year < 100)
year += 1900;
}
else /* The input dates have no year, so use current year */
year = m_greg.year(); // Can use m_greg here as it was already initialized in the initializer list earlier
m_greg = Date(year,
static_cast<Month>(std::stoi (what.str("MONTH"))),
std::stoi (what.str("DAY")));
}
gnc_ymd
GncDateImpl::year_month_day() const
{
auto boost_ymd = m_greg.year_month_day();
return {boost_ymd.year, boost_ymd.month.as_number(), boost_ymd.day};
}
std::string
GncDateImpl::format(const char* format) const
{
#ifdef __MINGW32__
return win_date_format(format, to_tm(m_greg));
#else
using Facet = boost::gregorian::date_facet;
std::stringstream ss;
//The stream destructor frees the facet, so it must be heap-allocated.
auto output_facet(new Facet(normalize_format(format).c_str()));
ss.imbue(std::locale(gnc_get_locale(), output_facet));
ss << m_greg;
return ss.str();
#endif
}
bool operator<(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg < b.m_greg; }
bool operator>(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg > b.m_greg; }
bool operator==(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg == b.m_greg; }
bool operator<=(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg <= b.m_greg; }
bool operator>=(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg >= b.m_greg; }
bool operator!=(const GncDateImpl& a, const GncDateImpl& b) { return a.m_greg != b.m_greg; }
/* =================== Presentation-class Implementations ====================*/
/* GncDateTime */
GncDateTime::GncDateTime() : m_impl(new GncDateTimeImpl) {}
GncDateTime::GncDateTime(const time64 time) :
m_impl(new GncDateTimeImpl(time)) {}
GncDateTime::GncDateTime(const struct tm tm) :
m_impl(new GncDateTimeImpl(tm)) {}
GncDateTime::GncDateTime(std::string str) :
m_impl(new GncDateTimeImpl(str)) {}
GncDateTime::~GncDateTime() = default;
GncDateTime::GncDateTime(const GncDate& date, DayPart part) :
m_impl(new GncDateTimeImpl(*(date.m_impl), part)) {}
void
GncDateTime::now()
{
m_impl->now();
}
GncDateTime::operator time64() const
{
return m_impl->operator time64();
}
GncDateTime::operator struct tm() const
{
return m_impl->operator struct tm();
}
long
GncDateTime::offset() const
{
return m_impl->offset();
}
struct tm
GncDateTime::utc_tm() const
{
return m_impl->utc_tm();
}
GncDate
GncDateTime::date() const
{
return GncDate(m_impl->date());
}
std::string
GncDateTime::format(const char* format) const
{
return m_impl->format(format);
}
std::string
GncDateTime::format_zulu(const char* format) const
{
return m_impl->format_zulu(format);
}
std::string
GncDateTime::format_iso8601() const
{
return m_impl->format_iso8601();
}
std::string
GncDateTime::timestamp()
{
return GncDateTimeImpl::timestamp();
}
/* GncDate */
GncDate::GncDate() : m_impl{new GncDateImpl} {}
GncDate::GncDate(int year, int month, int day) :
m_impl(new GncDateImpl(year, month, day)) {}
GncDate::GncDate(const std::string str, const std::string fmt) :
m_impl(new GncDateImpl(str, fmt)) {}
GncDate::GncDate(std::unique_ptr<GncDateImpl> impl) :
m_impl(std::move(impl)) {}
GncDate::GncDate(const GncDate& a) :
m_impl(new GncDateImpl(*a.m_impl)) {}
GncDate::GncDate(GncDate&&) = default;
GncDate::~GncDate() = default;
GncDate&
GncDate::operator=(const GncDate& a)
{
m_impl.reset(new GncDateImpl(*a.m_impl));
return *this;
}
GncDate&
GncDate::operator=(GncDate&&) = default;
void
GncDate::today()
{
m_impl->today();
}
std::string
GncDate::format(const char* format)
{
return m_impl->format(format);
}
gnc_ymd
GncDate::year_month_day() const
{
return m_impl->year_month_day();
}
bool operator<(const GncDate& a, const GncDate& b) { return *(a.m_impl) < *(b.m_impl); }
bool operator>(const GncDate& a, const GncDate& b) { return *(a.m_impl) > *(b.m_impl); }
bool operator==(const GncDate& a, const GncDate& b) { return *(a.m_impl) == *(b.m_impl); }
bool operator<=(const GncDate& a, const GncDate& b) { return *(a.m_impl) <= *(b.m_impl); }
bool operator>=(const GncDate& a, const GncDate& b) { return *(a.m_impl) >= *(b.m_impl); }
bool operator!=(const GncDate& a, const GncDate& b) { return *(a.m_impl) != *(b.m_impl); }
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