From cc20c47e19c0e23fc7aea61e51bcae3376af69c7 Mon Sep 17 00:00:00 2001
From: Vladislav Shchapov <phprus@gmail.com>
Date: Sat, 30 Oct 2021 19:32:21 +0500
Subject: [PATCH] Make locale-independent and C locale formats consistent among
 platforms

---
 include/fmt/chrono.h | 10 ----------
 test/chrono-test.cc  | 17 +++++++++++------
 2 files changed, 11 insertions(+), 16 deletions(-)

diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index 874dc4d9f0f5c..997bb2d0dd94c 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -1590,11 +1590,6 @@ template <typename OutputIt, typename Char> class tm_writer {
 
   void on_datetime(numeric_system ns) {
     if (is_classic_) {
-#ifdef _WIN32
-      on_us_date();
-      *out_++ = ' ';
-      on_iso_time();
-#else
       on_abbr_weekday();
       *out_++ = ' ';
       on_abbr_month();
@@ -1604,7 +1599,6 @@ template <typename OutputIt, typename Char> class tm_writer {
       on_iso_time();
       *out_++ = ' ';
       on_year(numeric_system::standard);
-#endif
     } else {
       format_localized('c', ns == numeric_system::standard ? '\0' : 'E');
     }
@@ -1735,16 +1729,12 @@ template <typename OutputIt, typename Char> class tm_writer {
 
   void on_12_hour_time() {
     if (is_classic_) {
-#ifdef _WIN32
-      on_iso_time();
-#else
       char buf[8];
       write_digit2_separated(buf, to_unsigned(tm_hour12()),
                              to_unsigned(tm_min()), to_unsigned(tm_sec()), ':');
       out_ = copy_str<Char>(std::begin(buf), std::end(buf), out_);
       *out_++ = ' ';
       on_am_pm();
-#endif
     } else {
       format_localized('r');
     }
diff --git a/test/chrono-test.cc b/test/chrono-test.cc
index 6eaf1cfb5d1dd..8a85331b7d15d 100644
--- a/test/chrono-test.cc
+++ b/test/chrono-test.cc
@@ -248,13 +248,18 @@ TEST(chrono_test, time_point) {
   EXPECT_EQ(strftime_full(t2), fmt::format("{:%Y-%m-%d %H:%M:%S}", t2));
 
   std::vector<std::string> spec_list = {
-      "%%",  "%n",  "%t",  "%Y",  "%EY", "%y",  "%Oy", "%Ey", "%C",  "%EC",
-      "%G",  "%g",  "%b",  "%h",  "%B",  "%m",  "%Om", "%U",  "%OU", "%W",
-      "%OW", "%V",  "%OV", "%j",  "%d",  "%Od", "%e",  "%Oe", "%a",  "%A",
-      "%w",  "%Ow", "%u",  "%Ou", "%H",  "%OH", "%I",  "%OI", "%M",  "%OM",
-      "%S",  "%OS", "%c",  "%Ec", "%x",  "%Ex", "%X",  "%EX", "%D",  "%F",
-      "%r",  "%R",  "%T",  "%p",  "%z",  "%Z"};
+      "%%",  "%n",  "%t",  "%Y",  "%EY", "%y",  "%Oy", "%Ey", "%C",
+      "%EC", "%G",  "%g",  "%b",  "%h",  "%B",  "%m",  "%Om", "%U",
+      "%OU", "%W",  "%OW", "%V",  "%OV", "%j",  "%d",  "%Od", "%e",
+      "%Oe", "%a",  "%A",  "%w",  "%Ow", "%u",  "%Ou", "%H",  "%OH",
+      "%I",  "%OI", "%M",  "%OM", "%S",  "%OS", "%x",  "%Ex", "%X",
+      "%EX", "%D",  "%F",  "%R",  "%T",  "%p",  "%z",  "%Z"};
   spec_list.push_back("%Y-%m-%d %H:%M:%S");
+#ifndef _WIN32
+  // Disabled on Windows, because this formats is not consistent among platforms
+  spec_list.insert(spec_list.end(), {"%c", "%Ec", "%r"});
+#endif
+
   for (const auto& spec : spec_list) {
     auto t = std::chrono::system_clock::to_time_t(t1);
     auto tm = *std::localtime(&t);