Line data    Source code

       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             : #include <cmath>
       6             : 
       7             : #include "src/base/platform/platform-posix-time.h"
       8             : 
       9             : namespace v8 {
      10             : namespace base {
      11             : 
      12           0 : const char* PosixDefaultTimezoneCache::LocalTimezone(double time) {
      13           0 :   if (std::isnan(time)) return "";
      14           0 :   time_t tv = static_cast<time_t>(std::floor(time / msPerSecond));
      15             :   struct tm tm;
      16           0 :   struct tm* t = localtime_r(&tv, &tm);
      17           0 :   if (!t || !t->tm_zone) return "";
      18           0 :   return t->tm_zone;
      19             : }
      20             : 
      21          10 : double PosixDefaultTimezoneCache::LocalTimeOffset(double time_ms, bool is_utc) {
      22             :   // Preserve the old behavior for non-ICU implementation by ignoring both
      23             :   // time_ms and is_utc.
      24          10 :   time_t tv = time(nullptr);
      25             :   struct tm tm;
      26          10 :   struct tm* t = localtime_r(&tv, &tm);
      27             :   // tm_gmtoff includes any daylight savings offset, so subtract it.
      28          20 :   return static_cast<double>(t->tm_gmtoff * msPerSecond -
      29          20 :                              (t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
      30             : }
      31             : 
      32             : }  // namespace base
      33             : }  // namespace v8