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GetTimeZoneString: Use standard features

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Also forces GMT on MinGW due to broken strftime.
This commit is contained in:
lat9nq 2023-05-22 14:19:08 -04:00
commit 6d7dcdc874
1 changed files with 17 additions and 2 deletions
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19
src/common/settings.cpp
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@ -8,6 +8,8 @@
#include <limits>
#endif
#include <string_view>
#include <fmt/chrono.h>
#include <fmt/core.h>
#include "common/assert.h"
#include "common/fs/path_util.h"
@ -39,6 +41,11 @@ std::string GetTimeZoneString() {
const std::chrono::time_zone* current_zone = time_zone_data.current_zone();
std::string_view current_zone_name = current_zone->name();
location_name = current_zone_name;
#elif 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"
location_name = timezones[0];
break;
#else
static constexpr std::array offsets{
0, 0, 3600, -21600, -19768, 7200, 7509, -1521, -18000, -18000,
@ -56,8 +63,16 @@ std::string GetTimeZoneString() {
};
const auto now = std::time(nullptr);
const struct std::tm local = *std::localtime(&now);
const int system_offset = local.tm_gmtoff - (local.tm_isdst ? 3600 : 0);
const struct std::tm& local = *std::localtime(&now);
const std::string clock_offset_s = fmt::format("{:%z}", local);
if (clock_offset_s.empty()) {
location_name = timezones[0];
break;
}
const int hours_offset = std::stoi(clock_offset_s) / 100;
const int minutes_offset = std::stoi(clock_offset_s) - hours_offset * 100;
const int system_offset =
hours_offset * 3600 + minutes_offset * 60 - (local.tm_isdst ? 3600 : 0);
int min = std::numeric_limits<int>::max();
int min_index = -1;