Fix DateTime with recent versions of tzdata

An backport of http://trac.webkit.org/changeset/150833 needed for
correct time KRAT, YAKT and MOS timezones.

Change-Id: I3b5369d1427757c0d638865324a36e43dcaa60bf
Task-number: QTBUG-41422
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

3 files changed, 13 insertions, 15 deletions

diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/DateConstructor.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/DateConstructor.cpp
index e9a5c29..532eedb 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/DateConstructor.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/DateConstructor.cpp
@@ -129,10 +129,8 @@ ConstructType DateConstructor::getConstructData(ConstructData& constructData)
 // ECMA 15.9.2
 static JSValue JSC_HOST_CALL callDate(ExecState* exec, JSObject*, JSValue, const ArgList&)
 {
-    time_t localTime = time(0);
-    tm localTM;
-    getLocalTime(&localTime, &localTM);
-    GregorianDateTime ts(exec, localTM);
+    GregorianDateTime ts;
+    msToGregorianDateTime(exec, currentTimeMS(), false, ts);
     DateConversionBuffer date;
     DateConversionBuffer time;
     formatDate(ts, date);
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp
index 1c25c16..f90d495 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.cpp
@@ -143,7 +143,6 @@ JSGlobalData::JSGlobalData(bool isShared)
     , functionCodeBlockBeingReparsed(0)
     , firstStringifierToMark(0)
     , markStack(jsArrayVPtr)
-    , cachedUTCOffset(NaN)
 #ifndef NDEBUG
     , mainThreadOnly(false)
 #endif
@@ -259,8 +258,7 @@ JSGlobalData::ClientData::~ClientData()
 
 void JSGlobalData::resetDateCache()
 {
-    cachedUTCOffset = NaN;
-    dstOffsetCache.reset();
+    localTimeOffsetCache.reset();
     cachedDateString = UString();
     dateInstanceCache.reset();
 }
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.h b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.h
index e38a2bc..6431978 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.h
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSGlobalData.h
@@ -39,6 +39,7 @@
 #include "SmallStrings.h"
 #include "TimeoutChecker.h"
 #include "WeakRandom.h"
+#include <wtf/DateMath.h>
 #include <wtf/Forward.h>
 #include <wtf/HashMap.h>
 #include <wtf/RefCounted.h>
@@ -63,21 +64,23 @@ namespace JSC {
     struct HashTable;
     struct Instruction;    
 
-    struct DSTOffsetCache {
-        DSTOffsetCache()
+    struct LocalTimeOffsetCache {
+        LocalTimeOffsetCache()
+            : start(0.0)
+            , end(-1.0)
+            , increment(0.0)
         {
-            reset();
         }
-        
+
         void reset()
         {
-            offset = 0.0;
+            offset = LocalTimeOffset();
             start = 0.0;
             end = -1.0;
             increment = 0.0;
         }
 
-        double offset;
+        LocalTimeOffset offset;
         double start;
         double end;
         double increment;
@@ -180,8 +183,7 @@ namespace JSC {
 
         MarkStack markStack;
 
-        double cachedUTCOffset;
-        DSTOffsetCache dstOffsetCache;
+        LocalTimeOffsetCache localTimeOffsetCache;
         
         UString cachedDateString;
         double cachedDateStringValue;