diff options
Diffstat (limited to '')
| -rw-r--r-- | src/common/time_zone.cpp | 63 |
1 files changed, 59 insertions, 4 deletions
diff --git a/src/common/time_zone.cpp b/src/common/time_zone.cpp index 126836b01..d8d7896c6 100644 --- a/src/common/time_zone.cpp +++ b/src/common/time_zone.cpp @@ -2,14 +2,33 @@ // SPDX-License-Identifier: GPL-2.0-or-later #include <chrono> +#include <exception> #include <iomanip> #include <sstream> +#include <stdexcept> +#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"; } @@ -18,10 +37,7 @@ static std::string GetOsTimeZoneOffset() { const std::time_t t{std::time(nullptr)}; const std::tm tm{*std::localtime(&t)}; - std::stringstream ss; - ss << std::put_time(&tm, "%z"); // Get the current timezone offset, e.g. "-400", as a string - - return ss.str(); + return fmt::format("{:%z}", tm); } static int ConvertOsTimeZoneOffsetToInt(const std::string& timezone) { @@ -45,4 +61,43 @@ std::chrono::seconds GetCurrentOffsetSeconds() { return std::chrono::seconds{seconds}; } +// Key is [Hours * 100 + Minutes], multiplied by 100 if DST +const static std::map<s64, const char*> off_timezones = { + {530, "Asia/Calcutta"}, {930, "Australia/Darwin"}, {845, "Australia/Eucla"}, + {103000, "Australia/Adelaide"}, {1030, "Australia/Lord_Howe"}, {630, "Indian/Cocos"}, + {1245, "Pacific/Chatham"}, {134500, "Pacific/Chatham"}, {-330, "Canada/Newfoundland"}, + {-23000, "Canada/Newfoundland"}, {430, "Asia/Kabul"}, {330, "Asia/Tehran"}, + {43000, "Asia/Tehran"}, {545, "Asia/Kathmandu"}, {-930, "Asia/Marquesas"}, +}; + +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 + const s64 seconds = static_cast<s64>(GetCurrentOffsetSeconds().count()); + + const s64 minutes = seconds / 60; + const s64 hours = minutes / 60; + + const s64 minutes_off = minutes - hours * 60; + + if (minutes_off != 0) { + const auto the_time = std::time(nullptr); + const struct std::tm& local = *std::localtime(&the_time); + const bool is_dst = local.tm_isdst != 0; + + const s64 tz_index = (hours * 100 + minutes_off) * (is_dst ? 100 : 1); + + try { + return off_timezones.at(tz_index); + } catch (std::out_of_range&) { + LOG_ERROR(Common, "Time zone {} not handled, defaulting to hour offset.", tz_index); + } + } + return fmt::format("Etc/GMT{:s}{:d}", hours > 0 ? "-" : "+", std::abs(hours)); +#endif +} + } // namespace Common::TimeZone |