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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <chrono>
#include <iomanip>
#include <sstream>
#include <fmt/chrono.h>
#include <fmt/core.h>
#include "common/logging/log.h"
#include "common/settings.h"
#include "common/time_zone.h"
namespace Common::TimeZone {
// Time zone strings
constexpr std::array timezones{
"GMT", "GMT", "CET", "CST6CDT", "Cuba", "EET", "Egypt", "Eire",
"EST", "EST5EDT", "GB", "GB-Eire", "GMT", "GMT+0", "GMT-0", "GMT0",
"Greenwich", "Hongkong", "HST", "Iceland", "Iran", "Israel", "Jamaica", "Japan",
"Kwajalein", "Libya", "MET", "MST", "MST7MDT", "Navajo", "NZ", "NZ-CHAT",
"Poland", "Portugal", "PRC", "PST8PDT", "ROC", "ROK", "Singapore", "Turkey",
"UCT", "Universal", "UTC", "W-SU", "WET", "Zulu",
};
const std::array<const char*, 46>& GetTimeZoneStrings() {
return timezones;
}
std::string GetDefaultTimeZone() {
return "GMT";
}
static std::string GetOsTimeZoneOffset() {
const std::time_t t{std::time(nullptr)};
const std::tm tm{*std::localtime(&t)};
return fmt::format("{:%z}", tm);
}
static int ConvertOsTimeZoneOffsetToInt(const std::string& timezone) {
try {
return std::stoi(timezone);
} catch (const std::invalid_argument&) {
LOG_CRITICAL(Common, "invalid_argument with {}!", timezone);
return 0;
} catch (const std::out_of_range&) {
LOG_CRITICAL(Common, "out_of_range with {}!", timezone);
return 0;
}
}
std::chrono::seconds GetCurrentOffsetSeconds() {
const int offset{ConvertOsTimeZoneOffsetToInt(GetOsTimeZoneOffset())};
int seconds{(offset / 100) * 60 * 60}; // Convert hour component to seconds
seconds += (offset % 100) * 60; // Convert minute component to seconds
return std::chrono::seconds{seconds};
}
std::string FindSystemTimeZone() {
#if defined(MINGW)
// MinGW has broken strftime -- https://sourceforge.net/p/mingw-w64/bugs/793/
// e.g. fmt::format("{:%z}") -- returns "Eastern Daylight Time" when it should be "-0400"
return timezones[0];
#else
// Time zone offset in seconds from GMT
constexpr std::array offsets{
0, 0, 3600, -21600, -19768, 7200, 7509, -1521, -18000, -18000, -75, -75,
0, 0, 0, 0, 0, 27402, -36000, -968, 12344, 8454, -18430, 33539,
40160, 3164, 3600, -25200, -25200, -25196, 41944, 44028, 5040, -2205, 29143, -28800,
29160, 30472, 24925, 6952, 0, 0, 0, 9017, 0, 0,
};
// If the time zone recognizes Daylight Savings Time
constexpr std::array dst{
false, false, true, true, true, true, true, true, false, true, true, true,
false, false, false, false, false, true, false, false, true, true, true, true,
false, true, true, false, true, true, true, true, true, true, true, true,
true, true, true, true, false, false, false, true, true, false,
};
static std::string system_time_zone_cached{};
if (!system_time_zone_cached.empty()) {
return system_time_zone_cached;
}
const auto now = std::time(nullptr);
const struct std::tm& local = *std::localtime(&now);
const s64 system_offset = GetCurrentOffsetSeconds().count() - (local.tm_isdst ? 3600 : 0);
int min = std::numeric_limits<int>::max();
int min_index = -1;
for (u32 i = 2; i < offsets.size(); i++) {
// Skip if system is celebrating DST but considered time zone does not
if (local.tm_isdst && !dst[i]) {
continue;
}
const auto offset = offsets[i];
const int difference = static_cast<int>(std::abs(offset - system_offset));
if (difference < min) {
min = difference;
min_index = i;
}
}
system_time_zone_cached = GetTimeZoneStrings()[min_index];
return system_time_zone_cached;
#endif
}
} // namespace Common::TimeZone
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