Move chrono-specific code to a separate header

CMakeLists.txt

@@ -138,8 +138,8 @@ function(add_headers VAR)
 endfunction()
 
 # Define the fmt library, its includes and the needed defines.
-add_headers(FMT_HEADERS color.h core.h format.h format-inl.h locale.h ostream.h
+add_headers(FMT_HEADERS chrono.h color.h core.h format.h format-inl.h locale.h
-                        printf.h time.h ranges.h)
+                        ostream.h printf.h time.h ranges.h)
 set(FMT_SOURCES src/format.cc)
 if (HAVE_OPEN)
   add_headers(FMT_HEADERS posix.h)

include/fmt/chrono.h

@@ -0,0 +1,336 @@
+// Formatting library for C++ - chrono support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_CHRONO_H_
+#define FMT_CHRONO_H_
+
+#include "format.h"
+#include "locale.h"
+
+#include <chrono>
+#include <ctime>
+#include <locale>
+#include <sstream>
+
+FMT_BEGIN_NAMESPACE
+
+namespace internal{
+
+enum class numeric_system {
+  standard,
+  // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
+  alternative
+};
+
+// Parses a put_time-like format string and invokes handler actions.
+template <typename Char, typename Handler>
+FMT_CONSTEXPR const Char *parse_chrono_format(
+    const Char *begin, const Char *end, Handler &&handler) {
+  auto ptr = begin;
+  while (ptr != end) {
+    auto c = *ptr;
+    if (c == '}') break;
+    if (c != '%') {
+      ++ptr;
+      continue;
+    }
+    if (begin != ptr)
+      handler.on_text(begin, ptr);
+    ++ptr; // consume '%'
+    if (ptr == end)
+      throw format_error("invalid format");
+    c = *ptr++;
+    switch (c) {
+    case '%':
+      handler.on_text(ptr - 1, ptr);
+      break;
+    // Day of the week:
+    case 'a':
+      handler.on_abbr_weekday();
+      break;
+    case 'A':
+      handler.on_full_weekday();
+      break;
+    case 'w':
+      handler.on_dec0_weekday(numeric_system::standard);
+      break;
+    case 'u':
+      handler.on_dec1_weekday(numeric_system::standard);
+      break;
+    // Month:
+    case 'b':
+      handler.on_abbr_month();
+      break;
+    case 'B':
+      handler.on_full_month();
+      break;
+    // Hour, minute, second:
+    case 'H':
+      handler.on_24_hour(numeric_system::standard);
+      break;
+    case 'I':
+      handler.on_12_hour(numeric_system::standard);
+      break;
+    case 'M':
+      handler.on_minute(numeric_system::standard);
+      break;
+    case 'S':
+      handler.on_second(numeric_system::standard);
+      break;
+    // Other:
+    case 'c':
+      handler.on_std_datetime();
+      break;
+    case 'x':
+      handler.on_loc_date();
+      break;
+    case 'X':
+      handler.on_loc_time();
+      break;
+    case 'D':
+      handler.on_us_date();
+      break;
+    case 'F':
+      handler.on_iso_date();
+      break;
+    case 'r':
+      handler.on_12_hour_time();
+      break;
+    case 'R':
+      handler.on_24_hour_time();
+      break;
+    // Alternative numeric system:
+    case 'O':
+      if (ptr == end)
+        throw format_error("invalid format");
+      c = *ptr++;
+      switch (c) {
+      case 'w':
+        handler.on_dec0_weekday(numeric_system::alternative);
+        break;
+      case 'u':
+        handler.on_dec1_weekday(numeric_system::alternative);
+        break;
+      case 'H':
+        handler.on_24_hour(numeric_system::alternative);
+        break;
+      case 'I':
+        handler.on_12_hour(numeric_system::alternative);
+        break;
+      case 'M':
+        handler.on_minute(numeric_system::alternative);
+        break;
+      case 'S':
+        handler.on_second(numeric_system::alternative);
+        break;
+      }
+      break;
+      // TODO: parse more format specifiers
+    }
+    begin = ptr;
+  }
+  if (begin != ptr)
+    handler.on_text(begin, ptr);
+  return ptr;
+}
+
+struct chrono_format_checker {
+  template <typename Char>
+  void on_text(const Char *, const Char *) {}
+  void on_abbr_weekday() {}
+  void on_full_weekday() {}
+  void on_dec0_weekday(numeric_system) {}
+  void on_dec1_weekday(numeric_system) {}
+  void on_abbr_month() {}
+  void on_full_month() {}
+  void on_24_hour(numeric_system) {}
+  void on_12_hour(numeric_system) {}
+  void on_minute(numeric_system) {}
+  void on_second(numeric_system) {}
+  void on_std_datetime() {}
+  void on_loc_date() {}
+  void on_loc_time() {}
+  void on_us_date() {}
+  void on_iso_date() {}
+  void on_12_hour_time() {}
+  void on_24_hour_time() {}
+};
+
+template <typename Int>
+inline int to_int(Int value) {
+  FMT_ASSERT(value >= (std::numeric_limits<int>::min)() &&
+             value <= (std::numeric_limits<int>::max)(), "invalid value");
+  return static_cast<int>(value);
+}
+
+template <typename FormatContext>
+struct chrono_formatter {
+  FormatContext &context;
+  typename FormatContext::iterator out;
+  std::chrono::seconds s;
+  std::chrono::milliseconds ms;
+
+  typedef typename FormatContext::char_type char_type;
+
+  explicit chrono_formatter(FormatContext &ctx)
+    : context(ctx), out(ctx.out()) {}
+
+  int hour() const { return to_int((s.count() / 3600) % 24); }
+
+  int hour12() const {
+    auto hour = to_int((s.count() / 3600) % 12);
+    return hour > 0 ? hour : 12;
+  }
+
+  int minute() const { return to_int((s.count() / 60) % 60); }
+  int second() const { return to_int(s.count() % 60); }
+
+  std::tm time() const {
+    auto time = std::tm();
+    time.tm_hour = hour();
+    time.tm_min = minute();
+    time.tm_sec = second();
+    return time;
+  }
+
+  std::tm datetime() const {
+    auto t = time();
+    t.tm_mday = 1;
+    return t;
+  }
+
+  std::tm date() const {
+    auto t = std::tm();
+    t.tm_mday = 1;
+    return t;
+  }
+
+  void write(int value, int width) {
+    typedef typename int_traits<int>::main_type main_type;
+    main_type n = to_unsigned(value);
+    int num_digits = static_cast<int>(internal::count_digits(n));
+    if (width > num_digits)
+      out = std::fill_n(out, width - num_digits, '0');
+    out = format_decimal<char_type>(out, n, num_digits);
+  }
+
+  void format_localized(const tm &time, const char *format) {
+    auto locale = context.locale().template get<std::locale>();
+    auto &facet = std::use_facet<std::time_put<char_type>>(locale);
+    std::basic_ostringstream<char_type> os;
+    os.imbue(locale);
+    facet.put(os, os, ' ', &time, format, format + std::strlen(format));
+    auto str = os.str();
+    std::copy(str.begin(), str.end(), out);
+  }
+
+  void on_text(const char_type *begin, const char_type *end) {
+    std::copy(begin, end, out);
+  }
+
+  void on_abbr_weekday() {}
+  void on_full_weekday() {}
+  void on_dec0_weekday(numeric_system) {}
+  void on_dec1_weekday(numeric_system) {}
+  void on_abbr_month() {}
+  void on_full_month() {}
+
+  void on_24_hour(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(hour(), 2);
+    auto time = tm();
+    time.tm_hour = hour();
+    format_localized(time, "%OH");
+  }
+
+  void on_12_hour(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(hour12(), 2);
+    auto time = tm();
+    time.tm_hour = hour();
+    format_localized(time, "%OI");
+  }
+
+  void on_minute(numeric_system ns) {
+    if (ns == numeric_system::standard)
+      return write(minute(), 2);
+    auto time = tm();
+    time.tm_min = minute();
+    format_localized(time, "%OM");
+  }
+
+  void on_second(numeric_system ns) {
+    if (ns == numeric_system::standard) {
+      write(second(), 2);
+      if (ms != std::chrono::milliseconds(0)) {
+        *out++ = '.';
+        write(to_int(ms.count()), 3);
+      }
+      return;
+    }
+    auto time = tm();
+    time.tm_sec = second();
+    format_localized(time, "%OS");
+  }
+
+  void on_std_datetime() { format_localized(datetime(), "%c"); }
+  void on_loc_date() { format_localized(date(), "%x"); }
+  void on_loc_time() { format_localized(datetime(), "%X"); }
+
+  void on_us_date() {
+    write(1, 2);
+    *out++ = '/';
+    write(0, 2);
+    *out++ = '/';
+    write(0, 2);
+  }
+
+  void on_iso_date() {
+    write(1, 4);
+    *out++ = '-';
+    write(0, 2);
+    *out++ = '-';
+    write(0, 2);
+  }
+
+  void on_12_hour_time() { format_localized(time(), "%r"); }
+
+  void on_24_hour_time() {
+    write(hour(), 2);
+    *out++ = ':';
+    write(minute(), 2);
+  }
+};
+}  // namespace internal
+
+template <typename Rep, typename Period, typename Char>
+struct formatter<std::chrono::duration<Rep, Period>, Char> {
+  mutable basic_string_view<Char> format_str;
+  typedef std::chrono::duration<Rep, Period> duration;
+
+  FMT_CONSTEXPR auto parse(basic_parse_context<Char> &ctx)
+      -> decltype(ctx.begin()) {
+    auto begin = ctx.begin(), end = ctx.end();
+    end = parse_chrono_format(begin, end, internal::chrono_format_checker());
+    format_str = basic_string_view<Char>(&*begin, end - begin);
+    return end;
+  }
+
+  template <typename FormatContext>
+  auto format(const duration &d, FormatContext &ctx)
+      -> decltype(ctx.out()) {
+    internal::chrono_formatter<FormatContext> f(ctx);
+    f.s = std::chrono::duration_cast<std::chrono::seconds>(d);
+    f.ms = std::chrono::duration_cast<std::chrono::milliseconds>(d - f.s);
+    parse_chrono_format(format_str.begin(), format_str.end(), f);
+    return f.out;
+  }
+};
+
+FMT_END_NAMESPACE
+
+#endif  // FMT_CHRONO_H_

include/fmt/time.h

@@ -12,11 +12,6 @@
 #include <ctime>
 #include <locale>
 
-#if FMT_HAS_INCLUDE(<chrono>)
-# include <chrono>
-# include <sstream>
-#endif
-
 FMT_BEGIN_NAMESPACE
 
 // Prevents expansion of a preceding token as a function-style macro.
@@ -28,242 +23,8 @@ inline null<> localtime_r FMT_NOMACRO(...) { return null<>(); }
 inline null<> localtime_s(...) { return null<>(); }
 inline null<> gmtime_r(...) { return null<>(); }
 inline null<> gmtime_s(...) { return null<>(); }
-
-enum class numeric_system {
-  standard,
-  // Alternative numeric system, e.g. 十二 instead of 12 in ja_JP locale.
-  alternative
-};
-
-// Parses a put_time-like format string and invokes handler actions.
-template <typename Char, typename Handler>
-FMT_CONSTEXPR const Char *parse_chrono_format(
-    const Char *begin, const Char *end, Handler &&handler) {
-  auto ptr = begin;
-  while (ptr != end) {
-    auto c = *ptr;
-    if (c == '}') break;
-    if (c != '%') {
-      ++ptr;
-      continue;
-    }
-    if (begin != ptr)
-      handler.on_text(begin, ptr);
-    ++ptr; // consume '%'
-    if (ptr == end)
-      throw format_error("invalid format");
-    c = *ptr++;
-    switch (c) {
-    case '%':
-      handler.on_text(ptr - 1, ptr);
-      break;
-    // Day of the week:
-    case 'a':
-      handler.on_abbr_weekday();
-      break;
-    case 'A':
-      handler.on_full_weekday();
-      break;
-    case 'w':
-      handler.on_dec0_weekday(numeric_system::standard);
-      break;
-    case 'u':
-      handler.on_dec1_weekday(numeric_system::standard);
-      break;
-    // Month:
-    case 'b':
-      handler.on_abbr_month();
-      break;
-    case 'B':
-      handler.on_full_month();
-      break;
-    // Hour, minute, second:
-    case 'H':
-      handler.on_24_hour(numeric_system::standard);
-      break;
-    case 'I':
-      handler.on_12_hour(numeric_system::standard);
-      break;
-    case 'M':
-      handler.on_minute(numeric_system::standard);
-      break;
-    case 'S':
-      handler.on_second(numeric_system::standard);
-      break;
-    // Alternative numeric system:
-    case 'O':
-      if (ptr == end)
-        throw format_error("invalid format");
-      c = *ptr++;
-      switch (c) {
-      case 'w':
-        handler.on_dec0_weekday(numeric_system::alternative);
-        break;
-      case 'u':
-        handler.on_dec1_weekday(numeric_system::alternative);
-        break;
-      case 'H':
-        handler.on_24_hour(numeric_system::alternative);
-        break;
-      case 'I':
-        handler.on_12_hour(numeric_system::alternative);
-        break;
-      case 'M':
-        handler.on_minute(numeric_system::alternative);
-        break;
-      case 'S':
-        handler.on_second(numeric_system::alternative);
-        break;
-      }
-      break;
-      // TODO: parse more format specifiers
-    }
-    begin = ptr;
-  }
-  if (begin != ptr)
-    handler.on_text(begin, ptr);
-  return ptr;
-}
-
-struct chrono_format_checker {
-  template <typename Char>
-  void on_text(const Char *, const Char *) {}
-  void on_abbr_weekday() {}
-  void on_full_weekday() {}
-  void on_dec0_weekday(numeric_system) {}
-  void on_dec1_weekday(numeric_system) {}
-  void on_abbr_month() {}
-  void on_full_month() {}
-  void on_24_hour(numeric_system) {}
-  void on_12_hour(numeric_system) {}
-  void on_minute(numeric_system) {}
-  void on_second(numeric_system) {}
-};
 }  // namespace internal
 
-#ifdef __cpp_lib_chrono
-namespace internal {
-
-template <typename Int>
-inline int to_int(Int value) {
-  FMT_ASSERT(value >= (std::numeric_limits<int>::min)() &&
-             value <= (std::numeric_limits<int>::max)(), "invalid value");
-  return static_cast<int>(value);
-}
-
-template <typename FormatContext>
-struct chrono_formatter {
-  FormatContext &context;
-  typename FormatContext::iterator out;
-  std::chrono::seconds s;
-  std::chrono::milliseconds ms;
-
-  using char_type = typename FormatContext::char_type;
-
-  explicit chrono_formatter(FormatContext &ctx)
-    : context(ctx), out(ctx.out()) {}
-
-  void write(int value, int width) {
-    typedef typename int_traits<int>::main_type main_type;
-    main_type n = to_unsigned(value);
-    int num_digits = static_cast<int>(internal::count_digits(n));
-    if (width > num_digits)
-      out = std::fill_n(out, width - num_digits, '0');
-    out = format_decimal<char_type>(out, n, num_digits);
-  }
-
-  void format_localized(const tm &time, char format) {
-    auto locale = context.locale().template get<std::locale>();
-    auto &facet = std::use_facet<std::time_put<char_type>>(locale);
-    std::basic_ostringstream<char_type> os;
-    os.imbue(locale);
-    const char format_str[] = {'%', 'O', format};
-    facet.put(os, os, ' ', &time, format_str, format_str + sizeof(format_str));
-    auto str = os.str();
-    std::copy(str.begin(), str.end(), out);
-  }
-
-  void on_text(const char_type *begin, const char_type *end) {
-    std::copy(begin, end, out);
-  }
-
-  void on_abbr_weekday() {}
-  void on_full_weekday() {}
-  void on_dec0_weekday(numeric_system) {}
-  void on_dec1_weekday(numeric_system) {}
-  void on_abbr_month() {}
-  void on_full_month() {}
-
-  void on_24_hour(numeric_system ns) {
-    auto hour = to_int((s.count() / 3600) % 24);
-    if (ns == numeric_system::standard)
-      return write(hour, 2);
-    auto time = tm();
-    time.tm_hour = hour;
-    format_localized(time, 'H');
-  }
-
-  void on_12_hour(numeric_system ns) {
-    auto hour = to_int((s.count() / 3600) % 12);
-    hour = hour > 0 ? hour : 12;
-    if (ns == numeric_system::standard)
-      return write(hour, 2);
-    auto time = tm();
-    time.tm_hour = hour;
-    format_localized(time, 'I');
-  }
-
-  void on_minute(numeric_system ns) {
-    auto minute = to_int((s.count() / 60) % 60);
-    if (ns == numeric_system::standard)
-      return write(minute, 2);
-    auto time = tm();
-    time.tm_min = minute;
-    format_localized(time, 'M');
-  }
-
-  void on_second(numeric_system ns) {
-    auto second = to_int(s.count() % 60);
-    if (ns == numeric_system::standard) {
-      write(second, 2);
-      if (ms != std::chrono::milliseconds()) {
-        *out++ = '.';
-        write(to_int(ms.count()), 3);
-      }
-      return;
-    }
-    auto time = tm();
-    time.tm_sec = second;
-    format_localized(time, 'S');
-  }
-};
-}  // namespace internal
-
-template <typename Rep, typename Period, typename Char>
-struct formatter<std::chrono::duration<Rep, Period>, Char> {
-  mutable basic_string_view<Char> format_str;
-  using Duration = std::chrono::duration<Rep, Period>;
-
-  FMT_CONSTEXPR auto parse(basic_parse_context<Char> &ctx)
-      -> decltype(ctx.begin()) {
-    auto begin = ctx.begin(), end = ctx.end();
-    end = parse_chrono_format(begin, end, internal::chrono_format_checker());
-    format_str = basic_string_view<Char>(&*begin, end - begin);
-    return end;
-  }
-
-  template <typename FormatContext>
-  auto format(const Duration &d, FormatContext &ctx)
-      -> decltype(ctx.out()) {
-    internal::chrono_formatter<FormatContext> f(ctx);
-    f.s = std::chrono::duration_cast<std::chrono::seconds>(d);
-    f.ms = std::chrono::duration_cast<std::chrono::milliseconds>(d - f.s);
-    parse_chrono_format(format_str.begin(), format_str.end(), f);
-    return f.out;
-  }
-};
-#endif  // __cpp_lib_chrono
-
 // Thread-safe replacement for std::localtime
 inline std::tm localtime(std::time_t time) {
   struct dispatcher {

test/CMakeLists.txt

@@ -85,6 +85,7 @@ function(add_fmt_test name)
 endfunction()
 
 add_fmt_test(assert-test)
+add_fmt_test(chrono-test)
 add_fmt_test(core-test)
 add_fmt_test(gtest-extra-test)
 add_fmt_test(format-test mock-allocator.h)

test/chrono-test.cc

@@ -0,0 +1,101 @@
+// Formatting library for C++ - time formatting tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/chrono.h"
+#include "gtest.h"
+
+#include <iomanip>
+
+std::tm make_tm() {
+  auto time = std::tm();
+  time.tm_mday = 1;
+  return time;
+}
+
+std::tm make_hour(int h) {
+  auto time = make_tm();
+  time.tm_hour = h;
+  return time;
+}
+
+std::tm make_minute(int m) {
+  auto time = make_tm();
+  time.tm_min = m;
+  return time;
+}
+
+std::tm make_second(int s) {
+  auto time = make_tm();
+  time.tm_sec = s;
+  return time;
+}
+
+std::string format_tm(const std::tm &time, const char *spec,
+                      const std::locale &loc) {
+  auto &facet = std::use_facet<std::time_put<char>>(loc);
+  std::ostringstream os;
+  os.imbue(loc);
+  facet.put(os, os, ' ', &time, spec, spec + std::strlen(spec));
+  return os.str();
+}
+
+#define EXPECT_TIME(spec, time, duration) { \
+    std::locale loc("ja_JP.utf8"); \
+    EXPECT_EQ(format_tm(time, spec, loc), \
+              fmt::format(loc, "{:" spec "}", duration)); \
+  }
+
+TEST(ChronoTest, Format) {
+  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(0)));
+  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(60)));
+  EXPECT_EQ("42", fmt::format("{:%S}", std::chrono::seconds(42)));
+  EXPECT_EQ("01.234", fmt::format("{:%S}", std::chrono::milliseconds(1234)));
+  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(0)));
+  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(60)));
+  EXPECT_EQ("42", fmt::format("{:%M}", std::chrono::minutes(42)));
+  EXPECT_EQ("01", fmt::format("{:%M}", std::chrono::seconds(61)));
+  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(0)));
+  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(24)));
+  EXPECT_EQ("14", fmt::format("{:%H}", std::chrono::hours(14)));
+  EXPECT_EQ("01", fmt::format("{:%H}", std::chrono::minutes(61)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(0)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(12)));
+  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(24)));
+  EXPECT_EQ("04", fmt::format("{:%I}", std::chrono::hours(4)));
+  EXPECT_EQ("02", fmt::format("{:%I}", std::chrono::hours(14)));
+  EXPECT_EQ("03:25:45",
+            fmt::format("{:%H:%M:%S}", std::chrono::seconds(12345)));
+  EXPECT_EQ("01/00/00", fmt::format("{:%D}", std::chrono::seconds()));
+  EXPECT_EQ("0001-00-00", fmt::format("{:%F}", std::chrono::seconds()));
+  EXPECT_EQ("03:25", fmt::format("{:%R}", std::chrono::seconds(12345)));
+}
+
+TEST(ChronoTest, Locale) {
+  const char *loc_name = "ja_JP.utf8";
+  bool has_locale = false;
+  std::locale loc;
+  try {
+    loc = std::locale(loc_name);
+    has_locale = true;
+  } catch (const std::runtime_error &) {}
+  if (!has_locale) {
+    fmt::print("{} locale is missing.\n", loc_name);
+    return;
+  }
+  EXPECT_TIME("%OH", make_hour(14), std::chrono::hours(14));
+  EXPECT_TIME("%OI", make_hour(14), std::chrono::hours(14));
+  EXPECT_TIME("%OM", make_minute(42), std::chrono::minutes(42));
+  EXPECT_TIME("%OS", make_second(42), std::chrono::seconds(42));
+  auto time = make_tm();
+  time.tm_hour = 3;
+  time.tm_min = 25;
+  time.tm_sec = 45;
+  EXPECT_TIME("%c", time, std::chrono::seconds(12345));
+  EXPECT_TIME("%x", time, std::chrono::seconds(12345));
+  EXPECT_TIME("%X", time, std::chrono::seconds(12345));
+  EXPECT_TIME("%r", time, std::chrono::seconds(12345));
+}

test/gtest-extra-test.cc

@@ -311,8 +311,8 @@ using fmt::error_code;
 using fmt::file;
 
 TEST(ErrorCodeTest, Ctor) {
-  EXPECT_EQ(0, error_code().get());
+  EXPECT_EQ(error_code().get(), 0);
-  EXPECT_EQ(42, error_code(42).get());
+  EXPECT_EQ(error_code(42).get(), 42);
 }
 
 TEST(OutputRedirectTest, ScopedRedirect) {

test/posix-test.cc

@@ -334,7 +334,7 @@ TEST(FileTest, Dup2NoExcept) {
   file copy = open_file();
   error_code ec;
   f.dup2(copy.descriptor(), ec);
-  EXPECT_EQ(0, ec.get());
+  EXPECT_EQ(ec.get(), 0);
   EXPECT_NE(f.descriptor(), copy.descriptor());
   EXPECT_READ(copy, FILE_CONTENT);
 }

test/time-test.cc

@@ -66,61 +66,3 @@ TEST(TimeTest, GMTime) {
   std::tm tm = *std::gmtime(&t);
   EXPECT_TRUE(EqualTime(tm, fmt::gmtime(t)));
 }
-
-#ifdef __cpp_lib_chrono
-TEST(TimeTest, Chrono) {
-  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(0)));
-  EXPECT_EQ("00", fmt::format("{:%S}", std::chrono::seconds(60)));
-  EXPECT_EQ("42", fmt::format("{:%S}", std::chrono::seconds(42)));
-  EXPECT_EQ("01.234", fmt::format("{:%S}", std::chrono::milliseconds(1234)));
-  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(0)));
-  EXPECT_EQ("00", fmt::format("{:%M}", std::chrono::minutes(60)));
-  EXPECT_EQ("42", fmt::format("{:%M}", std::chrono::minutes(42)));
-  EXPECT_EQ("01", fmt::format("{:%M}", std::chrono::seconds(61)));
-  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(0)));
-  EXPECT_EQ("00", fmt::format("{:%H}", std::chrono::hours(24)));
-  EXPECT_EQ("14", fmt::format("{:%H}", std::chrono::hours(14)));
-  EXPECT_EQ("01", fmt::format("{:%H}", std::chrono::minutes(61)));
-  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(0)));
-  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(12)));
-  EXPECT_EQ("12", fmt::format("{:%I}", std::chrono::hours(24)));
-  EXPECT_EQ("04", fmt::format("{:%I}", std::chrono::hours(4)));
-  EXPECT_EQ("02", fmt::format("{:%I}", std::chrono::hours(14)));
-  EXPECT_EQ("03:25:45",
-            fmt::format("{:%H:%M:%S}", std::chrono::seconds(12345)));
-}
-
-std::string format_tm(const std::tm &time, const char *spec,
-                      const std::locale &loc) {
-  std::ostringstream os;
-  os.imbue(loc);
-  os << std::put_time(&time, spec);
-  return os.str();
-}
-
-#define EXPECT_TIME(spec, field, value, duration) { \
-    auto time = std::tm(); \
-    time.field = value; \
-    std::locale("ja_JP.utf8"); \
-    EXPECT_EQ(format_tm(time, spec, loc), \
-              fmt::format(loc, "{:" spec "}", std::chrono::duration(value))); \
-  }
-
-TEST(TimeTest, ChronoLocale) {
-  const char *loc_name = "ja_JP.utf8";
-  bool has_locale = false;
-  std::locale loc;
-  try {
-    loc = std::locale(loc_name);
-    has_locale = true;
-  } catch (const std::runtime_error &) {}
-  if (!has_locale) {
-    fmt::print("{} locale is missing.\n", loc_name);
-    return;
-  }
-  EXPECT_TIME("%OH", tm_hour, 14, hours);
-  EXPECT_TIME("%OI", tm_hour, 14, hours);
-  EXPECT_TIME("%OM", tm_min, 42, minutes);
-  EXPECT_TIME("%OS", tm_sec, 42, seconds);
-}
-#endif