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common: Move system time zone string detection

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Moves it from Settings to Common::TimeZone, since this algorithm doesn't
depend on the setting. It also lets us use it in other libraries.
This commit is contained in:
lat9nq
2023-05-23 18:32:28 -04:00
parent 6d7dcdc874
commit 20f14b50fd
3 changed files with 78 additions and 79 deletions
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src/common/time_zone.h
+30
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@@ -3,15 +3,45 @@
#pragma once
#include <array>
#include <chrono>
#include <string>
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",
};
// 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,
};
/// Gets the default timezone, i.e. "GMT"
[[nodiscard]] std::string GetDefaultTimeZone();
/// Gets the offset of the current timezone (from the default), in seconds
[[nodiscard]] std::chrono::seconds GetCurrentOffsetSeconds();
/// Searches time zone offsets for the closest offset to the system time zone
[[nodiscard]] std::string FindSystemTimeZone();
} // namespace Common::TimeZone