1 // Copyright 2017 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_BASE_TIMEZONE_CACHE_H_ 6 #define V8_BASE_TIMEZONE_CACHE_H_ 7 8 namespace v8 { 9 namespace base { 10 11 class TimezoneCache { 12 public: 13 // Short name of the local timezone (e.g., EST) 14 virtual const char* LocalTimezone(double time_ms) = 0; 15 16 // ES #sec-daylight-saving-time-adjustment 17 // Daylight Saving Time Adjustment 18 virtual double DaylightSavingsOffset(double time_ms) = 0; 19 20 // ES #sec-local-time-zone-adjustment 21 // Local Time Zone Adjustment 22 // 23 // https://github.com/tc39/ecma262/pull/778 24 virtual double LocalTimeOffset(double time_ms, bool is_utc) = 0; 25 26 // Called when the local timezone changes 27 virtual void Clear() = 0; 28 29 // Called when tearing down the isolate ~TimezoneCache()30 virtual ~TimezoneCache() {} 31 }; 32 33 } // namespace base 34 } // namespace v8 35 36 #endif // V8_BASE_TIMEZONE_CACHE_H_ 37