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Improve ISO week-base-year formatter

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This commit is contained in:
Vladislav Shchapov
2021-10-10 19:52:02 +05:00
committed by Victor Zverovich
parent fbaaa5906b
commit 79c00ad8f2
2 changed files with 68 additions and 6 deletions
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38
test/chrono-test.cc
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@@ -7,6 +7,8 @@
#include "fmt/chrono.h"
#include <time.h>
#include <vector>
#include "gtest-extra.h" // EXPECT_THROW_MSG
@@ -57,6 +59,42 @@ TEST(chrono_test, format_tm) {
EXPECT_EQ(fmt::format("{:%D}", tm), "04/25/16");
EXPECT_EQ(fmt::format("{:%F}", tm), "2016-04-25");
EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
// for week on the year
// https://www.cl.cam.ac.uk/~mgk25/iso-time.html
std::vector<std::string> str_tm_list = {
"1975-12-29", // W01
"1977-01-02", // W53
"1999-12-27", // W52
"1999-12-31", // W52
"2000-01-01", // W52
"2000-01-02", // W52
"2000-01-03", // W1
};
std::vector<std::string> spec_list = {"%G", "%g", "%V"};
for (const auto& str_tm : str_tm_list) {
tm = std::tm();
// GCC 4 does not support std::get_time
// MSVC dows not support POSIX strptime
#ifdef _WIN32
std::istringstream ss(str_tm);
ss >> std::get_time(&tm, "%Y-%m-%d");
#else
strptime(str_tm.c_str(), "%Y-%m-%d", &tm);
#endif
// Because std::get_time doesn't calculate tm_yday, tm_wday, etc.
tm.tm_isdst = 0;
auto t = std::mktime(&tm);
tm = *std::localtime(&t);
for (const auto& spec : spec_list) {
char output[256] = {};
std::strftime(output, sizeof(output), spec.c_str(), &tm);
auto fmt_spec = std::string("{:").append(spec).append("}");
EXPECT_EQ(output, fmt::format(fmt::runtime(fmt_spec), tm));
}
}
}
// MSVC: