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// Copyright 2017 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_BASE_TIMEZONE_CACHE_H_ #define V8_BASE_TIMEZONE_CACHE_H_ namespace v8 { namespace base { class TimezoneCache { public: // Short name of the local timezone (e.g., EST) virtual const char* LocalTimezone(double time_ms) = 0; // ES #sec-daylight-saving-time-adjustment // Daylight Saving Time Adjustment virtual double DaylightSavingsOffset(double time_ms) = 0; // ES #sec-local-time-zone-adjustment // Local Time Zone Adjustment // // https://github.com/tc39/ecma262/pull/778 virtual double LocalTimeOffset(double time_ms, bool is_utc) = 0; /** * Time zone redetection indicator for Clear function. * * kSkip indicates host time zone doesn't have to be redetected. * kRedetect indicates host time zone should be redetected, and used to set * the default time zone. * * The host time zone detection may require file system access or similar * operations unlikely to be available inside a sandbox. If v8 is run inside a * sandbox, the host time zone has to be detected outside the sandbox * separately. */ enum class TimeZoneDetection { kSkip, kRedetect }; // Called when the local timezone changes virtual void Clear(TimeZoneDetection time_zone_detection) = 0; // Called when tearing down the isolate virtual ~TimezoneCache() = default; }; } // namespace base } // namespace v8 #endif // V8_BASE_TIMEZONE_CACHE_H_