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author | lat9nq <22451773+lat9nq@users.noreply.github.com> | 2023-05-24 00:32:28 +0200 |
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committer | lat9nq <22451773+lat9nq@users.noreply.github.com> | 2023-06-05 21:15:11 +0200 |
commit | 3979c7daa478199cff7bc985fceabcf30fadbc3b (patch) | |
tree | 52f24a4fed679dbac23aedfa29f2fc79e3d34870 /src/common/time_zone.cpp | |
parent | configure_system: Remove external offset on custom rtc (diff) | |
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Diffstat (limited to 'src/common/time_zone.cpp')
-rw-r--r-- | src/common/time_zone.cpp | 75 |
1 files changed, 71 insertions, 4 deletions
diff --git a/src/common/time_zone.cpp b/src/common/time_zone.cpp index 126836b01..717d751ba 100644 --- a/src/common/time_zone.cpp +++ b/src/common/time_zone.cpp @@ -4,12 +4,29 @@ #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"; } @@ -18,10 +35,7 @@ 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 +59,57 @@ std::chrono::seconds GetCurrentOffsetSeconds() { 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 |