Invalidate OS-specific datetime cache on configuration change notification

When V8 is informed that the system's date time configuration has changed,
it should also drop its OS-specific caches of time zone information

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/193933002

Patch from James Robinson <jamesr@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19808 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/date.cc

@@ -62,6 +62,7 @@ void DateCache::ResetDateCache() {
   after_ = &dst_[1];
   local_offset_ms_ = kInvalidLocalOffsetInMs;
   ymd_valid_ = false;
+  OS::TimeZoneChanged();
 }
 
 

src/platform-posix.cc

@@ -363,6 +363,9 @@ double OS::DaylightSavingsOffset(double time) {
 }
 
 
+void OS::TimeZoneChanged() {}
+
+
 int OS::GetLastError() {
   return errno;
 }

src/platform-win32.cc

@@ -251,6 +251,8 @@ 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 +613,11 @@ double OS::DaylightSavingsOffset(double time) {
 }
 
 
+void OS::TimeZoneChanged() {
+  Win32Time::TimeZoneChanged();
+}
+
+
 int OS::GetLastError() {
   return ::GetLastError();
 }

src/platform.h

@@ -193,6 +193,8 @@ class OS {
   // Returns the daylight savings offset for the given time.
   static double DaylightSavingsOffset(double time);
 
+  static void TimeZoneChanged();
+
   // Returns last OS error.
   static int GetLastError();