Reapply "Add support for timezone offset and timezone name."

runtime/lib/date.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <time.h>
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/native_entry.h"
@@ skipping 121 matching lines @@
   bool succeeded = BrokenDownToSecondsSinceEpoch(broken_down,
                                                  dart_is_utc.value(),
                                                  &value);
   if (!succeeded) {
     UNIMPLEMENTED();
   }
   arguments->SetReturn(Integer::Handle(Integer::New(value)));
 }
 
 
+DEFINE_NATIVE_ENTRY(DateNatives_timeZoneName, 1) {
+  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
+  int64_t seconds = dart_seconds.AsInt64Value();
+  const char* name;
+  bool succeeded = OS::GetTimeZoneName(seconds, &name);
+  if (!succeeded) {
+    UNIMPLEMENTED();
+  }
+  const String& dart_name = String::Handle(String::New(name));
+  arguments->SetReturn(dart_name);
+}
+
+
+DEFINE_NATIVE_ENTRY(DateNatives_timeZoneOffsetInSeconds, 1) {
+  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
+  int64_t seconds = dart_seconds.AsInt64Value();
+  int offset;
+  bool succeeded = OS::GetTimeZoneOffsetInSeconds(seconds, &offset);
+  if (!succeeded) {
+    UNIMPLEMENTED();
+  }
+  const Integer& dart_offset = Integer::Handle(Integer::New(offset));
+  arguments->SetReturn(dart_offset);
+}
+
+
 DEFINE_NATIVE_ENTRY(DateNatives_currentTimeMillis, 0) {
   const Integer& time = Integer::Handle(
       Integer::New(OS::GetCurrentTimeMillis()));
   arguments->SetReturn(time);
 }
 
 
 DEFINE_NATIVE_ENTRY(DateNatives_getYear, 2) {
   GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
   GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
@@ skipping 71 matching lines @@
   bool succeeded =
       BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
   if (!succeeded) {
     UNIMPLEMENTED();
   }
   const Smi& result = Smi::Handle(Smi::New(broken_down.seconds));
   arguments->SetReturn(result);
 }
 
 }  // namespace dart