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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.
#include <cmath>
#include "src/base/platform/platform-posix-time.h"
namespace v8 {
namespace base {
const char* PosixDefaultTimezoneCache::LocalTimezone(double time) {
if (std::isnan(time)) return "";
time_t tv = static_cast<time_t>(std::floor(time / msPerSecond));
struct tm tm;
struct tm* t = localtime_r(&tv, &tm);
if (!t || !t->tm_zone) return "";
return t->tm_zone;
}
double PosixDefaultTimezoneCache::LocalTimeOffset(double time_ms, bool is_utc) {
// Preserve the old behavior for non-ICU implementation by ignoring both
// time_ms and is_utc.
time_t tv = time(nullptr);
struct tm tm;
struct tm* t = localtime_r(&tv, &tm);
// tm_gmtoff includes any daylight savings offset, so subtract it.
return static_cast<double>(t->tm_gmtoff * msPerSecond -
(t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
}
} // namespace base
} // namespace v8
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