Invalidate OS-specific datetime cache on configuration change notification

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index 52c3050f3d4692bbc39374ce593019310ec237ca..f82dab8eb63f582b33871c7af04f5ec27e662b1e 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -76,7 +76,6 @@ inline void MemoryBarrier() {
 
 #endif  // __MINGW64_VERSION_MAJOR
 
-
 int localtime_s(tm* out_tm, const time_t* time) {
   tm* posix_local_time_struct = localtime(time);
   if (posix_local_time_struct == NULL) return 1;
@@ -251,6 +250,8 @@ class Win32Time {
   // timestamp taking into account daylight saving.
   char* LocalTimezone();
 
+  static void TimeZoneChanged() { tz_initialized_ = false; }
+
  private:
   // Constants for time conversion.
   static const int64_t kTimeEpoc = 116444736000000000LL;
@@ -611,6 +612,11 @@ double OS::DaylightSavingsOffset(double time) {
 }
 
 
+void OS::TimeZoneChanged() {
+  Win32Time::TimeZoneChanged();
+}
+
+
 int OS::GetLastError() {
   return ::GetLastError();
 }