xref: /llvm-project/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp (revision 6a54dfbfe534276d644d7f9c027f0deeb748dd53)

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: no-localization
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME

// XFAIL: availability-fp_to_chars-missing

// REQUIRES: locale.fr_FR.UTF-8
// REQUIRES: locale.ja_JP.UTF-8

// <chrono>

//  template<class Rep, class Period, class charT>
//    struct formatter<chrono::duration<Rep, Period>, charT>;

#include <chrono>
#include <format>

#include <cassert>
#include <concepts>
#include <locale>
#include <iostream>
#include <ratio>
#include <type_traits>

#include "formatter_tests.h"
#include "make_string.h"
#include "platform_support.h" // locale name macros
#include "test_macros.h"

template <class CharT>
static void test_no_chrono_specs() {
  using namespace std::literals::chrono_literals;

  check(SV("1as"), SV("{}"), std::chrono::duration<int, std::atto>(1));
  check(SV("1fs"), SV("{}"), std::chrono::duration<int, std::femto>(1));
  check(SV("1ps"), SV("{}"), std::chrono::duration<int, std::pico>(1));
  check(SV("1ns"), SV("{}"), 1ns);
#ifndef TEST_HAS_NO_UNICODE
  check(SV("1\u00b5s"), SV("{}"), 1us);
#else
  check(SV("1us"), SV("{}"), 1us);
#endif
  check(SV("1ms"), SV("{}"), 1ms);
  check(SV("1cs"), SV("{}"), std::chrono::duration<int, std::centi>(1));
  check(SV("1ds"), SV("{}"), std::chrono::duration<int, std::deci>(1));

  check(SV("1s"), SV("{}"), 1s);

  check(SV("1das"), SV("{}"), std::chrono::duration<int, std::deca>(1));
  check(SV("1hs"), SV("{}"), std::chrono::duration<int, std::hecto>(1));
  check(SV("1ks"), SV("{}"), std::chrono::duration<int, std::kilo>(1));
  check(SV("1Ms"), SV("{}"), std::chrono::duration<int, std::mega>(1));
  check(SV("1Gs"), SV("{}"), std::chrono::duration<int, std::giga>(1));
  check(SV("1Ts"), SV("{}"), std::chrono::duration<int, std::tera>(1));
  check(SV("1Ps"), SV("{}"), std::chrono::duration<int, std::peta>(1));
  check(SV("1Es"), SV("{}"), std::chrono::duration<int, std::exa>(1));

  check(SV("1min"), SV("{}"), 1min);
  check(SV("1h"), SV("{}"), 1h);
  check(SV("1d"), SV("{}"), std::chrono::duration<int, std::ratio<86400>>(1));

  check(SV("1[42]s"), SV("{}"), std::chrono::duration<int, std::ratio<42>>(1));
  check(SV("1[11]s"), SV("{}"), std::chrono::duration<int, std::ratio<33, 3>>(1));
  check(SV("1[11/9]s"), SV("{}"), std::chrono::duration<int, std::ratio<11, 9>>(1));
}

template <class CharT>
static void test_valid_positive_integral_values() {
  using namespace std::literals::chrono_literals;

  constexpr std::basic_string_view<CharT> fmt = SV(
      "{:"
      "%%H='%H'%t"
      "%%OH='%OH'%t"
      "%%I='%I'%t"
      "%%OI='%OI'%t"
      "%%M='%M'%t"
      "%%OM='%OM'%t"
      "%%S='%S'%t"
      "%%OS='%OS'%t"
      "%%p='%p'%t"
      "%%R='%R'%t"
      "%%T='%T'%t"
      "%%r='%r'%t"
      "%%X='%X'%t"
      "%%EX='%EX'%t"
      "%%j='%j'%t"
      "%%Q='%Q'%t"
      "%%q='%q'%t"
      "%n}");
  constexpr std::basic_string_view<CharT> lfmt = SV(
      "{:L"
      "%%H='%H'%t"
      "%%OH='%OH'%t"
      "%%I='%I'%t"
      "%%OI='%OI'%t"
      "%%M='%M'%t"
      "%%OM='%OM'%t"
      "%%S='%S'%t"
      "%%OS='%OS'%t"
      "%%p='%p'%t"
      "%%R='%R'%t"
      "%%T='%T'%t"
      "%%r='%r'%t"
      "%%X='%X'%t"
      "%%EX='%EX'%t"
      "%%j='%j'%t"
      "%%Q='%Q'%t"
      "%%q='%q'%t"
      "%n}");

  const std::locale loc(LOCALE_ja_JP_UTF_8);
  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));

  // Non localized output using C-locale
  check(SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
           "%p='AM'\t"
           "%R='00:00'\t"
           "%T='00:00:00'\t"
           "%r='12:00:00 AM'\t"
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
           "%j='0'\t"
           "%Q='0'\t"
           "%q='s'\t"
           "\n"),
        fmt,
        0s);

  check(SV("%H='11'\t"
           "%OH='11'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
           "%p='AM'\t"
           "%R='11:59'\t"
           "%T='11:59:59'\t"
           "%r='11:59:59 AM'\t"
           "%X='11:59:59'\t"
           "%EX='11:59:59'\t"
           "%j='0'\t"
           "%Q='43199'\t"
           "%q='s'\t"
           "\n"),
        fmt,
        11h + 59min + 59s);

  check(SV("%H='12'\t"
           "%OH='12'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
           "%p='PM'\t"
           "%R='12:00'\t"
           "%T='12:00:00'\t"
           "%r='12:00:00 PM'\t"
           "%X='12:00:00'\t"
           "%EX='12:00:00'\t"
           "%j='0'\t"
           "%Q='12'\t"
           "%q='h'\t"
           "\n"),
        fmt,
        12h);

  check(SV("%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
           "%p='PM'\t"
           "%R='23:59'\t"
           "%T='23:59:59'\t"
           "%r='11:59:59 PM'\t"
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        fmt,
        23h + 59min + 59s);

  check(SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
           "%p='AM'\t"
           "%R='00:00'\t"
           "%T='00:00:00'\t"
           "%r='12:00:00 AM'\t"
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
           "%j='7'\t"
           "%Q='7'\t"
           "%q='d'\t"
           "\n"),
        fmt,
        std::chrono::duration<int, std::ratio<86400>>(7));

  // Use the global locale (fr_FR)
  check(SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#if defined(_AIX)
           "%p='AM'\t"
#else
           "%p=''\t"
#endif
           "%R='00:00'\t"
           "%T='00:00:00'\t"
#ifdef _WIN32
           "%r='00:00:00'\t"
#elif defined(_AIX)
           "%r='12:00:00 AM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#else
           "%r='12:00:00 '\t"
#endif
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
           "%j='0'\t"
           "%Q='0'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        0s);

  check(SV("%H='11'\t"
           "%OH='11'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#if defined(_AIX)
           "%p='AM'\t"
#else
           "%p=''\t"
#endif
           "%R='11:59'\t"
           "%T='11:59:59'\t"
#ifdef _WIN32
           "%r='11:59:59'\t"
#elif defined(_AIX)
           "%r='11:59:59 AM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#else
           "%r='11:59:59 '\t"
#endif
           "%X='11:59:59'\t"
           "%EX='11:59:59'\t"
           "%j='0'\t"
           "%Q='43199'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        11h + 59min + 59s);

  check(SV("%H='12'\t"
           "%OH='12'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#if defined(_AIX)
           "%p='PM'\t"
#else
           "%p=''\t"
#endif
           "%R='12:00'\t"
           "%T='12:00:00'\t"
#ifdef _WIN32
           "%r='12:00:00'\t"
#elif defined(_AIX)
           "%r='12:00:00 PM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#else
           "%r='12:00:00 '\t"
#endif
           "%X='12:00:00'\t"
           "%EX='12:00:00'\t"
           "%j='0'\t"
           "%Q='12'\t"
           "%q='h'\t"
           "\n"),
        lfmt,
        12h);

  check(SV("%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#if defined(_AIX)
           "%p='PM'\t"
#else
           "%p=''\t"
#endif
           "%R='23:59'\t"
           "%T='23:59:59'\t"
#if defined(_AIX)
           "%r='11:59:59 PM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#elif defined(_WIN32)
           "%r='23:59:59'\t"
#else
           "%r='11:59:59 '\t"
#endif
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        23h + 59min + 59s);

  check(SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#if defined(_AIX)
           "%p='AM'\t"
#else
           "%p=''\t"
#endif
           "%R='00:00'\t"
           "%T='00:00:00'\t"
#ifdef _WIN32
           "%r='00:00:00'\t"
#elif defined(_AIX)
           "%r='12:00:00 AM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#elif defined(_WIN32)
           "%r='12:00:00'\t"
#else
           "%r='12:00:00 '\t"
#endif
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
           "%j='7'\t"
           "%Q='7'\t"
           "%q='d'\t"
           "\n"),
        lfmt,
        std::chrono::duration<int, std::ratio<86400>>(7));

  // Use supplied locale (ja_JP). This locale has a different alternate.
#if defined(__APPLE__) || defined(_AIX) || defined(_WIN32) || defined(__FreeBSD__)
  check(loc,
        SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#  if defined(__APPLE__)
           "%p='AM'\t"
#  else
           "%p='午前'\t"
#  endif
           "%R='00:00'\t"
           "%T='00:00:00'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='12:00:00 AM'\t"
#    else
           "%r='12:00:00 午前'\t"
#    endif
           "%X='00時00分00秒'\t"
           "%EX='00時00分00秒'\t"
#  elif defined(_WIN32)
           "%r='0:00:00'\t"
           "%X='0:00:00'\t"
           "%EX='0:00:00'\t"
#  else
           "%r='午前12:00:00'\t"
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
#  endif
           "%j='0'\t"
           "%Q='0'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        0s);

  check(loc,
        SV("%H='11'\t"
           "%OH='11'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#  if defined(__APPLE__)
           "%p='AM'\t"
#  else
           "%p='午前'\t"
#  endif
           "%R='11:59'\t"
           "%T='11:59:59'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='11:59:59 AM'\t"
#    else
           "%r='11:59:59 午前'\t"
#    endif
           "%X='11時59分59秒'\t"
           "%EX='11時59分59秒'\t"
#  elif defined(_WIN32)
           "%r='11:59:59'\t"
           "%X='11:59:59'\t"
           "%EX='11:59:59'\t"
#  else
           "%r='午前11:59:59'\t"
           "%X='11:59:59'\t"
           "%EX='11:59:59'\t"
#  endif
           "%j='0'\t"
           "%Q='43199'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        11h + 59min + 59s);

  check(loc,
        SV("%H='12'\t"
           "%OH='12'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#  if defined(__APPLE__)
           "%p='PM'\t"
#  else
           "%p='午後'\t"
#  endif
           "%R='12:00'\t"
           "%T='12:00:00'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='12:00:00 PM'\t"
#    else
           "%r='12:00:00 午後'\t"
#    endif
           "%X='12時00分00秒'\t"
           "%EX='12時00分00秒'\t"
#  else
#    ifdef _WIN32
           "%r='12:00:00'\t"
#    else
           "%r='午後12:00:00'\t"
#    endif
           "%X='12:00:00'\t"
           "%EX='12:00:00'\t"
#  endif
           "%j='0'\t"
           "%Q='12'\t"
           "%q='h'\t"
           "\n"),
        lfmt,
        12h);

  check(loc,
        SV("%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#  if defined(__APPLE__)
           "%p='PM'\t"
#  else
           "%p='午後'\t"
#  endif
           "%R='23:59'\t"
           "%T='23:59:59'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='11:59:59 PM'\t"
#    else
           "%r='11:59:59 午後'\t"
#    endif
           "%X='23時59分59秒'\t"
           "%EX='23時59分59秒'\t"
#  else
#    ifdef _WIN32
           "%r='23:59:59'\t"
#    else
           "%r='午後11:59:59'\t"
#    endif
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
#  endif
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        23h + 59min + 59s);

  check(loc,
        SV("%H='00'\t"
           "%OH='00'\t"
           "%I='12'\t"
           "%OI='12'\t"
           "%M='00'\t"
           "%OM='00'\t"
           "%S='00'\t"
           "%OS='00'\t"
#  if defined(__APPLE__)
           "%p='AM'\t"
#  else
           "%p='午前'\t"
#  endif
           "%R='00:00'\t"
           "%T='00:00:00'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='12:00:00 AM'\t"
#    else
           "%r='12:00:00 午前'\t"
#    endif
           "%X='00時00分00秒'\t"
           "%EX='00時00分00秒'\t"
#  elif defined(_WIN32)
           "%r='0:00:00'\t"
           "%X='0:00:00'\t"
           "%EX='0:00:00'\t"
#  else
           "%r='午前12:00:00'\t"
           "%X='00:00:00'\t"
           "%EX='00:00:00'\t"
#  endif
           "%j='7'\t"
           "%Q='7'\t"
           "%q='d'\t"
           "\n"),
        lfmt,
        std::chrono::duration<int, std::ratio<86400>>(7));
#else  // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)
  check(loc,
        SV("%H='00'\t"
           "%OH='〇'\t"
           "%I='12'\t"
           "%OI='十二'\t"
           "%M='00'\t"
           "%OM='〇'\t"
           "%S='00'\t"
           "%OS='〇'\t"
           "%p='午前'\t"
           "%R='00:00'\t"
           "%T='00:00:00'\t"
           "%r='午前12時00分00秒'\t"
           "%X='00時00分00秒'\t"
           "%EX='00時00分00秒'\t"
           "%j='0'\t"
           "%Q='0'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        0s);

  check(loc,
        SV("%H='11'\t"
           "%OH='十一'\t"
           "%I='11'\t"
           "%OI='十一'\t"
           "%M='59'\t"
           "%OM='五十九'\t"
           "%S='59'\t"
           "%OS='五十九'\t"
           "%p='午前'\t"
           "%R='11:59'\t"
           "%T='11:59:59'\t"
           "%r='午前11時59分59秒'\t"
           "%X='11時59分59秒'\t"
           "%EX='11時59分59秒'\t"
           "%j='0'\t"
           "%Q='43199'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        11h + 59min + 59s);

  check(loc,
        SV("%H='12'\t"
           "%OH='十二'\t"
           "%I='12'\t"
           "%OI='十二'\t"
           "%M='00'\t"
           "%OM='〇'\t"
           "%S='00'\t"
           "%OS='〇'\t"
           "%p='午後'\t"
           "%R='12:00'\t"
           "%T='12:00:00'\t"
           "%r='午後12時00分00秒'\t"
           "%X='12時00分00秒'\t"
           "%EX='12時00分00秒'\t"
           "%j='0'\t"
           "%Q='12'\t"
           "%q='h'\t"
           "\n"),
        lfmt,
        12h);

  check(loc,
        SV("%H='23'\t"
           "%OH='二十三'\t"
           "%I='11'\t"
           "%OI='十一'\t"
           "%M='59'\t"
           "%OM='五十九'\t"
           "%S='59'\t"
           "%OS='五十九'\t"
           "%p='午後'\t"
           "%R='23:59'\t"
           "%T='23:59:59'\t"
           "%r='午後11時59分59秒'\t"
           "%X='23時59分59秒'\t"
           "%EX='23時59分59秒'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        23h + 59min + 59s);

  check(loc,
        SV("%H='00'\t"
           "%OH='〇'\t"
           "%I='12'\t"
           "%OI='十二'\t"
           "%M='00'\t"
           "%OM='〇'\t"
           "%S='00'\t"
           "%OS='〇'\t"
           "%p='午前'\t"
           "%R='00:00'\t"
           "%T='00:00:00'\t"
           "%r='午前12時00分00秒'\t"
           "%X='00時00分00秒'\t"
           "%EX='00時00分00秒'\t"
           "%j='7'\t"
           "%Q='7'\t"
           "%q='d'\t"
           "\n"),
        lfmt,
        std::chrono::duration<int, std::ratio<86400>>(7));
#endif // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)

  std::locale::global(std::locale::classic());
}

template <class CharT>
static void test_valid_negative_integral_values() {
  // [time.format]/4 The result of formatting a std::chrono::duration instance
  // holding a negative value, or an hh_mm_ss object h for which
  // h.is_negative() is true, is equivalent to the output of the corresponding
  // positive value, with a STATICALLY-WIDEN<charT>("-") character sequence
  // placed before the replacement of the initial conversion specifier.
  //
  // Note in this case %% is the initial conversion specifier.
  using namespace std::literals::chrono_literals;

  constexpr std::basic_string_view<CharT> fmt = SV(
      "{:"
      "%%H='%H'%t"
      "%%OH='%OH'%t"
      "%%I='%I'%t"
      "%%OI='%OI'%t"
      "%%M='%M'%t"
      "%%OM='%OM'%t"
      "%%S='%S'%t"
      "%%OS='%OS'%t"
      "%%p='%p'%t"
      "%%R='%R'%t"
      "%%T='%T'%t"
      "%%r='%r'%t"
      "%%X='%X'%t"
      "%%EX='%EX'%t"
      "%%j='%j'%t"
      "%%Q='%Q'%t"
      "%%q='%q'%t"
      "%n}");
  constexpr std::basic_string_view<CharT> lfmt = SV(
      "{:L"
      "%%H='%H'%t"
      "%%OH='%OH'%t"
      "%%I='%I'%t"
      "%%OI='%OI'%t"
      "%%M='%M'%t"
      "%%OM='%OM'%t"
      "%%S='%S'%t"
      "%%OS='%OS'%t"
      "%%p='%p'%t"
      "%%R='%R'%t"
      "%%T='%T'%t"
      "%%r='%r'%t"
      "%%X='%X'%t"
      "%%EX='%EX'%t"
      "%%j='%j'%t"
      "%%Q='%Q'%t"
      "%%q='%q'%t"
      "%n}");

  const std::locale loc(LOCALE_ja_JP_UTF_8);
  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));

  // Non localized output using C-locale
  check(SV("-%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
           "%p='PM'\t"
           "%R='23:59'\t"
           "%T='23:59:59'\t"
           "%r='11:59:59 PM'\t"
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        fmt,
        -(23h + 59min + 59s));

  // Use the global locale (fr_FR)
  check(SV("-%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#if defined(_AIX)
           "%p='PM'\t"
#else
           "%p=''\t"
#endif
           "%R='23:59'\t"
           "%T='23:59:59'\t"
#if defined(_AIX)
           "%r='11:59:59 PM'\t"
#elif defined(__APPLE__) || defined(__FreeBSD__)
           "%r=''\t"
#elif defined(_WIN32)
           "%r='23:59:59'\t"
#else
           "%r='11:59:59 '\t"
#endif
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        -(23h + 59min + 59s));

  // Use supplied locale (ja_JP). This locale has a different alternate.
#if defined(__APPLE__) || defined(_AIX) || defined(_WIN32) || defined(__FreeBSD__)
  check(loc,
        SV("-%H='23'\t"
           "%OH='23'\t"
           "%I='11'\t"
           "%OI='11'\t"
           "%M='59'\t"
           "%OM='59'\t"
           "%S='59'\t"
           "%OS='59'\t"
#  if defined(__APPLE__)
           "%p='PM'\t"
#  else
           "%p='午後'\t"
#  endif
           "%R='23:59'\t"
           "%T='23:59:59'\t"
#  if defined(__APPLE__) || defined(__FreeBSD__)
#    if defined(__APPLE__)
           "%r='11:59:59 PM'\t"
#    else
           "%r='11:59:59 午後'\t"
#    endif
           "%X='23時59分59秒'\t"
           "%EX='23時59分59秒'\t"
#  elif defined(_WIN32)
           "%r='23:59:59'\t"
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
#  else
           "%r='午後11:59:59'\t"
           "%X='23:59:59'\t"
           "%EX='23:59:59'\t"
#  endif
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        -(23h + 59min + 59s));
#else  // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)|| defined(__FreeBSD__)
  check(loc,
        SV("-%H='23'\t"
           "%OH='二十三'\t"
           "%I='11'\t"
           "%OI='十一'\t"
           "%M='59'\t"
           "%OM='五十九'\t"
           "%S='59'\t"
           "%OS='五十九'\t"
           "%p='午後'\t"
           "%R='23:59'\t"
           "%T='23:59:59'\t"
           "%r='午後11時59分59秒'\t"
           "%X='23時59分59秒'\t"
           "%EX='23時59分59秒'\t"
           "%j='0'\t"
           "%Q='86399'\t"
           "%q='s'\t"
           "\n"),
        lfmt,
        -(23h + 59min + 59s));
#endif // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)|| defined(__FreeBSD__)
  std::locale::global(std::locale::classic());
}

template <class CharT>
static void test_valid_fractional_values() {
  using namespace std::literals::chrono_literals;

  const std::locale loc(LOCALE_ja_JP_UTF_8);
  std::locale::global(std::locale(LOCALE_fr_FR_UTF_8));

  // Non localized output using C-locale
  check(SV("00.000000001"), SV("{:%S}"), 1ns);
  check(SV("00.000000501"), SV("{:%S}"), 501ns);
  check(SV("00.000001000"), SV("{:%S}"), 1000ns);
  check(SV("00.000000000001"), SV("{:%S}"), std::chrono::duration<int, std::pico>(1));
  check(SV("00.000000000000001"), SV("{:%S}"), std::chrono::duration<int, std::femto>(1));
  check(SV("00.000000000000000001"), SV("{:%S}"), std::chrono::duration<int, std::atto>(1));

  check(SV("00.001"), SV("{:%S}"), 1ms);
  check(SV("00.01"), SV("{:%S}"), std::chrono::duration<int, std::centi>(1));
  check(SV("00.1"), SV("{:%S}"), std::chrono::duration<int, std::deci>(1));
  check(SV("01.1"), SV("{:%S}"), std::chrono::duration<int, std::deci>(11));

  check(SV("00.001"), SV("{:%S}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(SV("00.011"), SV("{:%S}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(SV("01"), SV("{:%S}"), std::chrono::duration<long double>(61.123456789));

  check(SV("00.000000001"), SV("{:%OS}"), 1ns);
  check(SV("00.000000501"), SV("{:%OS}"), 501ns);
  check(SV("00.000001000"), SV("{:%OS}"), 1000ns);
  check(SV("00.000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::pico>(1));
  check(SV("00.000000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::femto>(1));
  check(SV("00.000000000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::atto>(1));

  check(SV("00.001"), SV("{:%OS}"), 1ms);
  check(SV("00.01"), SV("{:%OS}"), std::chrono::duration<int, std::centi>(1));
  check(SV("00.1"), SV("{:%OS}"), std::chrono::duration<int, std::deci>(1));
  check(SV("01.1"), SV("{:%OS}"), std::chrono::duration<int, std::deci>(11));

  check(SV("00.001"), SV("{:%OS}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(SV("00.011"), SV("{:%OS}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(SV("01"), SV("{:%OS}"), std::chrono::duration<long double>(61.123456789));

  check(SV("01:05:06.000000001"), SV("{:%T}"), 1h + 5min + 6s + 1ns);
  check(SV("01:05:06.000000501"), SV("{:%T}"), 1h + 5min + 6s + 501ns);
  check(SV("01:05:06.000001000"), SV("{:%T}"), 1h + 5min + 6s + 1000ns);

  check(SV("01:05:06.001"), SV("{:%T}"), 1h + 5min + 6s + 1ms);
  check(SV("01:05:06.01"), SV("{:%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::centi>(1));
  check(SV("01:05:06.1"), SV("{:%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(1));
  check(SV("01:05:07.1"), SV("{:%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(11));

  check(
      SV("00:01:02"), SV("{:%T}"), std::chrono::duration<float, std::ratio<60>>(1) + std::chrono::duration<float>(2.5));
  check(SV("01:05:11"),
        SV("{:%T}"),
        std::chrono::duration<double, std::ratio<3600>>(1) + std::chrono::duration<double, std::ratio<60>>(5) +
            std::chrono::duration<double>(11.123456789));
  check(SV("01:06:01"),
        SV("{:%T}"),
        std::chrono::duration<long double, std::ratio<3600>>(1) +
            std::chrono::duration<long double, std::ratio<60>>(5) + std::chrono::duration<long double>(61.123456789));

  check(SV("0"), SV("{:%j}"), std::chrono::duration<float, std::milli>(1.));
  check(SV("1"), SV("{:%j}"), std::chrono::duration<double, std::milli>(86'400'000));
  check(SV("1"), SV("{:%j}"), std::chrono::duration<long double, std::ratio<7 * 24 * 3600>>(0.14285714286));

  check(SV("1000000"), SV("{:%Q}"), 1'000'000s);
  check(SV("1"), SV("{:%Q}"), std::chrono::duration<float, std::milli>(1.));
  check(SV("1.123456789"), SV("{:.6%Q}"), std::chrono::duration<double, std::milli>(1.123456789));
  check(SV("1.123456789"), SV("{:.9%Q}"), std::chrono::duration<long double, std::milli>(1.123456789));

  // Use the global locale (fr_FR)
  check(SV("00,000000001"), SV("{:L%S}"), 1ns);
  check(SV("00,000000501"), SV("{:L%S}"), 501ns);
  check(SV("00,000001000"), SV("{:L%S}"), 1000ns);
  check(SV("00,000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::pico>(1));
  check(SV("00,000000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::femto>(1));
  check(SV("00,000000000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::atto>(1));

  check(SV("00,001"), SV("{:L%S}"), 1ms);
  check(SV("00,01"), SV("{:L%S}"), std::chrono::duration<int, std::centi>(1));
  check(SV("00,1"), SV("{:L%S}"), std::chrono::duration<int, std::deci>(1));
  check(SV("01,1"), SV("{:L%S}"), std::chrono::duration<int, std::deci>(11));

  check(SV("00,001"), SV("{:L%S}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(SV("00,011"), SV("{:L%S}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(SV("01"), SV("{:L%S}"), std::chrono::duration<long double>(61.123456789));

  check(SV("00,000000001"), SV("{:L%OS}"), 1ns);
  check(SV("00,000000501"), SV("{:L%OS}"), 501ns);
  check(SV("00,000001000"), SV("{:L%OS}"), 1000ns);
  check(SV("00,000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::pico>(1));
  check(SV("00,000000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::femto>(1));
  check(SV("00,000000000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::atto>(1));

  check(SV("00,001"), SV("{:L%OS}"), 1ms);
  check(SV("00,01"), SV("{:L%OS}"), std::chrono::duration<int, std::centi>(1));
  check(SV("00,1"), SV("{:L%OS}"), std::chrono::duration<int, std::deci>(1));
  check(SV("01,1"), SV("{:L%OS}"), std::chrono::duration<int, std::deci>(11));

  check(SV("00,001"), SV("{:L%OS}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(SV("00,011"), SV("{:L%OS}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(SV("01"), SV("{:L%OS}"), std::chrono::duration<long double>(61.123456789));

  check(SV("01:05:06,000000001"), SV("{:L%T}"), 1h + 5min + 6s + 1ns);
  check(SV("01:05:06,000000501"), SV("{:L%T}"), 1h + 5min + 6s + 501ns);
  check(SV("01:05:06,000001000"), SV("{:L%T}"), 1h + 5min + 6s + 1000ns);

  check(SV("01:05:06,001"), SV("{:L%T}"), 1h + 5min + 6s + 1ms);
  check(SV("01:05:06,01"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::centi>(1));
  check(SV("01:05:06,1"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(1));
  check(SV("01:05:07,1"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(11));

  check(SV("00:01:02"),
        SV("{:L%T}"),
        std::chrono::duration<float, std::ratio<60>>(1) + std::chrono::duration<float>(2.5));
  check(SV("01:05:11"),
        SV("{:L%T}"),
        std::chrono::duration<double, std::ratio<3600>>(1) + std::chrono::duration<double, std::ratio<60>>(5) +
            std::chrono::duration<double>(11.123456789));
  check(SV("01:06:01"),
        SV("{:L%T}"),
        std::chrono::duration<long double, std::ratio<3600>>(1) +
            std::chrono::duration<long double, std::ratio<60>>(5) + std::chrono::duration<long double>(61.123456789));

  check(SV("0"), SV("{:L%j}"), std::chrono::duration<float, std::milli>(1.));
  check(SV("1"), SV("{:L%j}"), std::chrono::duration<double, std::milli>(86'400'000));
  check(SV("1"), SV("{:L%j}"), std::chrono::duration<long double, std::ratio<7 * 24 * 3600>>(0.14285714286));

  check(SV("1000000"), SV("{:L%Q}"), 1'000'000s); // The Standard mandates not localized.
  check(SV("1"), SV("{:L%Q}"), std::chrono::duration<float, std::milli>(1.));
  check(SV("1.123456789"), SV("{:.6L%Q}"), std::chrono::duration<double, std::milli>(1.123456789));
  check(SV("1.123456789"), SV("{:.9L%Q}"), std::chrono::duration<long double, std::milli>(1.123456789));

  // Use supplied locale (ja_JP). This locale has a different alternate.
  check(loc, SV("00.000000001"), SV("{:L%S}"), 1ns);
  check(loc, SV("00.000000501"), SV("{:L%S}"), 501ns);
  check(loc, SV("00.000001000"), SV("{:L%S}"), 1000ns);
  check(loc, SV("00.000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::pico>(1));
  check(loc, SV("00.000000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::femto>(1));
  check(loc, SV("00.000000000000000001"), SV("{:L%S}"), std::chrono::duration<int, std::atto>(1));

  check(loc, SV("00.001"), SV("{:L%S}"), 1ms);
  check(loc, SV("00.01"), SV("{:L%S}"), std::chrono::duration<int, std::centi>(1));
  check(loc, SV("00.1"), SV("{:L%S}"), std::chrono::duration<int, std::deci>(1));
  check(loc, SV("01.1"), SV("{:L%S}"), std::chrono::duration<int, std::deci>(11));

  check(loc, SV("00.001"), SV("{:L%S}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(loc, SV("00.011"), SV("{:L%S}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(loc, SV("01"), SV("{:L%S}"), std::chrono::duration<long double>(61.123456789));

#if defined(__APPLE__) || defined(_AIX) || defined(_WIN32) || defined(__FreeBSD__)

  check(SV("00.000000001"), SV("{:%OS}"), 1ns);
  check(SV("00.000000501"), SV("{:%OS}"), 501ns);
  check(SV("00.000001000"), SV("{:%OS}"), 1000ns);
  check(SV("00.000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::pico>(1));
  check(SV("00.000000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::femto>(1));
  check(SV("00.000000000000000001"), SV("{:%OS}"), std::chrono::duration<int, std::atto>(1));

  check(SV("00.001"), SV("{:%OS}"), 1ms);
  check(SV("00.01"), SV("{:%OS}"), std::chrono::duration<int, std::centi>(1));
  check(SV("00.1"), SV("{:%OS}"), std::chrono::duration<int, std::deci>(1));
  check(SV("01.1"), SV("{:%OS}"), std::chrono::duration<int, std::deci>(11));

  check(SV("00.001"), SV("{:%OS}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(SV("00.011"), SV("{:%OS}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(SV("01"), SV("{:%OS}"), std::chrono::duration<long double>(61.123456789));
#else  // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)|| defined(__FreeBSD__)

  check(loc, SV("〇.000000001"), SV("{:L%OS}"), 1ns);
  check(loc, SV("〇.000000501"), SV("{:L%OS}"), 501ns);
  check(loc, SV("〇.000001000"), SV("{:L%OS}"), 1000ns);
  check(loc, SV("〇.000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::pico>(1));
  check(loc, SV("〇.000000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::femto>(1));
  check(loc, SV("〇.000000000000000001"), SV("{:L%OS}"), std::chrono::duration<int, std::atto>(1));

  check(loc, SV("〇.001"), SV("{:L%OS}"), 1ms);
  check(loc, SV("〇.01"), SV("{:L%OS}"), std::chrono::duration<int, std::centi>(1));
  check(loc, SV("〇.1"), SV("{:L%OS}"), std::chrono::duration<int, std::deci>(1));
  check(loc, SV("一.1"), SV("{:L%OS}"), std::chrono::duration<int, std::deci>(11));

  check(loc, SV("〇.001"), SV("{:L%OS}"), std::chrono::duration<float, std::milli>(1.123456789));
  check(loc, SV("〇.011"), SV("{:L%OS}"), std::chrono::duration<double, std::milli>(11.123456789));
  check(loc, SV("一"), SV("{:L%OS}"), std::chrono::duration<long double>(61.123456789));
#endif // defined(__APPLE__) || defined(_AIX) || defined(_WIN32)|| defined(__FreeBSD__)

  check(loc, SV("01:05:06.000000001"), SV("{:L%T}"), 1h + 5min + 6s + 1ns);
  check(loc, SV("01:05:06.000000501"), SV("{:L%T}"), 1h + 5min + 6s + 501ns);
  check(loc, SV("01:05:06.000001000"), SV("{:L%T}"), 1h + 5min + 6s + 1000ns);

  check(loc, SV("01:05:06.001"), SV("{:L%T}"), 1h + 5min + 6s + 1ms);
  check(loc, SV("01:05:06.01"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::centi>(1));
  check(loc, SV("01:05:06.1"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(1));
  check(loc, SV("01:05:07.1"), SV("{:L%T}"), 1h + 5min + 6s + std::chrono::duration<int, std::deci>(11));

  check(loc,
        SV("00:01:02"),
        SV("{:L%T}"),
        std::chrono::duration<float, std::ratio<60>>(1) + std::chrono::duration<float>(2.5));
  check(loc,
        SV("01:05:11"),
        SV("{:L%T}"),
        std::chrono::duration<double, std::ratio<3600>>(1) + std::chrono::duration<double, std::ratio<60>>(5) +
            std::chrono::duration<double>(11.123456789));
  check(loc,
        SV("01:06:01"),
        SV("{:L%T}"),
        std::chrono::duration<long double, std::ratio<3600>>(1) +
            std::chrono::duration<long double, std::ratio<60>>(5) + std::chrono::duration<long double>(61.123456789));

  check(loc, SV("0"), SV("{:L%j}"), std::chrono::duration<float, std::milli>(1.));
  check(loc, SV("1"), SV("{:L%j}"), std::chrono::duration<double, std::milli>(86'400'000));
  check(loc, SV("1"), SV("{:L%j}"), std::chrono::duration<long double, std::ratio<7 * 24 * 3600>>(0.14285714286));

  check(loc, SV("1000000"), SV("{:L%Q}"), 1'000'000s); // The Standard mandates not localized.
  check(loc, SV("1"), SV("{:L%Q}"), std::chrono::duration<float, std::milli>(1.));
  check(loc, SV("1.123456789"), SV("{:.6L%Q}"), std::chrono::duration<double, std::milli>(1.123456789));
  check(loc, SV("1.123456789"), SV("{:.9L%Q}"), std::chrono::duration<long double, std::milli>(1.123456789));

  std::locale::global(std::locale::classic());
}

template <class CharT>
static void test_valid_values() {
  test_valid_positive_integral_values<CharT>();
  test_valid_negative_integral_values<CharT>();
  test_valid_fractional_values<CharT>();
}

template <class CharT>
static void test_pr62082() {
  // Examples in https://llvm.org/PR62082
  check(SV("39.223300"), SV("{:%S}"), std::chrono::duration<int, std::ratio<101, 103>>{40});
  check(SV("01.4755859375"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 1024>>{1511});

  // Test with all possible number of decimals [0, 18]. When it does not
  // fit in 18 decimals it uses 6.
  check(SV("05"), SV("{:%S}"), std::chrono::duration<float, std::ratio<1, 1>>{5}); // 0

  check(SV("05.0"), SV("{:%S}"), std::chrono::duration<float, std::ratio<1, 2>>{10}); // 1
  check(SV("05.5"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 2>>{11});   // 1

  check(SV("01.00"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 4>>{4});         // 2
  check(SV("01.50"), SV("{:%S}"), std::chrono::duration<double, std::ratio<1, 4>>{6});      // 2
  check(SV("01.75"), SV("{:%S}"), std::chrono::duration<long double, std::ratio<1, 4>>{7}); // 2

  check(SV("01.000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 8>>{8});                          // 3
  check(SV("01.0000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 16>>{16});                       // 4
  check(SV("01.00000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 32>>{32});                      // 5
  check(SV("01.000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 64>>{64});                     // 6
  check(SV("01.0000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 128>>{128});                  // 7
  check(SV("01.00000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 256>>{256});                 // 8
  check(SV("01.000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 512>>{512});                // 9
  check(SV("01.0000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 1024>>{1024});             // 10
  check(SV("01.00000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 2048>>{2048});            // 11
  check(SV("01.000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 4096>>{4096});           // 12
  check(SV("01.0000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 8192>>{8192});          // 13
  check(SV("01.00000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 16384>>{16384});       // 14
  check(SV("01.000000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 32768>>{32768});      // 15
  check(SV("01.0000000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 65536>>{65536});     // 16
  check(SV("01.00000000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 131072>>{131072});  // 17
  check(SV("01.000000000000000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 262144>>{262144}); // 18
  check(SV("01.000000"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 524288>>{524288});             // 19 -> 6

  // Infinite number of decimals will use 6 decimals.
  check(SV("00.111111"), SV("{:%S}"), std::chrono::duration<int, std::ratio<1, 9>>{1});
  check(SV("00.111111"), SV("{:%S}"), std::chrono::duration<float, std::ratio<1, 9>>{1});
  check(SV("00.111111"), SV("{:%S}"), std::chrono::duration<double, std::ratio<1, 9>>{1});
  check(SV("00.111111"), SV("{:%S}"), std::chrono::duration<long double, std::ratio<1, 9>>{1});
}

template <class CharT>
static void test_unsigned_duration() {
  // Reported in https://github.com/llvm/llvm-project/issues/96820
  using namespace std::literals::chrono_literals;

  check(SV("1as"), SV("{}"), std::chrono::duration<unsigned short, std::atto>(1));
  check(SV("1fs"), SV("{}"), std::chrono::duration<unsigned, std::femto>(1));
  check(SV("1ps"), SV("{}"), std::chrono::duration<unsigned long, std::pico>(1));
  check(SV("1ns"), SV("{}"), std::chrono::duration<unsigned long long, std::nano>(1));
}

template <class CharT>
static void test() {
  using namespace std::literals::chrono_literals;

  test_no_chrono_specs<CharT>();
  test_valid_values<CharT>();
  test_unsigned_duration<CharT>();
  test_pr62082<CharT>();

  check_invalid_types<CharT>(
      {SV("H"), SV("I"), SV("j"), SV("M"), SV("n"), SV("O"),  SV("p"),  SV("q"),  SV("Q"),  SV("r"),
       SV("R"), SV("S"), SV("t"), SV("T"), SV("X"), SV("EX"), SV("OH"), SV("OI"), SV("OM"), SV("OS")},
      0ms);

  check_exception("The format specifier expects a '%' or a '}'", SV("{:A"), 0ms);
  check_exception("The chrono specifiers contain a '{'", SV("{:%%{"), 0ms);
  check_exception("End of input while parsing a conversion specifier", SV("{:%"), 0ms);
  check_exception("End of input while parsing the modifier E", SV("{:%E"), 0ms);
  check_exception("End of input while parsing the modifier O", SV("{:%O"), 0ms);

  // Make sure the required values work, based on their minimum number of required bits per [time.syn].
  check(SV("23:47:16.854775807"),
        SV("{:%T}"),
        std::chrono::nanoseconds{0x7fff'ffff'ffff'ffffll}); // 64 bit signed value max
  check(SV("23:35:09.481983"),
        SV("{:%T}"),
        std::chrono::microseconds{0x003f'ffff'ffff'ffffll});                                 // 55 bit signed value max
  check(SV("06:20:44.415"), SV("{:%T}"), std::chrono::milliseconds{0x0000'fff'ffff'ffffll}); // 45 bit signed value max
  check(SV("01:53:03"), SV("{:%T}"), std::chrono::seconds{0x0000'0003'ffff'ffffll});         // 35 bit signed value max
  check(SV("12:15:00"), SV("{:%T}"), std::chrono::minutes{0x0fff'ffff});                     // 29 bit signed value max
  check(SV("15:00:00"), SV("{:%T}"), std::chrono::hours{0x003f'ffff});                       // 23 bit signed value max
  check(SV("00:00:00"), SV("{:%T}"), std::chrono::days{0x0ff'ffff});                         // 25 bit signed value max
  check(SV("00:00:00"), SV("{:%T}"), std::chrono::weeks{0x003f'ffff});                       // 22 bit signed value max
  check(SV("21:11:42"), SV("{:%T}"), std::chrono::months{0x0007'ffff});                      // 20 bit signed value max
  check(SV("05:42:00"), SV("{:%T}"), std::chrono::years{0xffff});                            // 17 bit signed value max

  // Precision not allowed
  check_exception("The format specifier expects a '%' or a '}'", SV("{:.3}"), 0ms);
}

int main(int, char**) {
  test<char>();

#ifndef TEST_HAS_NO_WIDE_CHARACTERS
  test<wchar_t>();
#endif

  return 0;
}