Make dates default to the local timezone if none specified

src/dateparser.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DATEPARSER_H_
 #define V8_DATEPARSER_H_
 
 #include "src/allocation.h"
 #include "src/char-predicates-inl.h"
 
@@ skipping 349 matching lines @@
 
    private:
     static const int kSize = 3;
     int comp_[kSize];
     int index_;
     int named_month_;
     // If set, ensures that data is always parsed in year-month-date order.
     bool is_iso_date_;
   };
 
-  // Tries to parse an ES5 Date Time String. Returns the next token
+  // Tries to parse an ES6 Date Time String. Returns the next token
   // to continue with in the legacy date string parser. If parsing is
   // complete, returns DateToken::EndOfInput(). If terminally unsuccessful,
   // returns DateToken::Invalid(). Otherwise parsing continues in the
   // legacy parser.
   template <typename Char>
-  static DateParser::DateToken ParseES5DateTime(
+  static DateParser::DateToken ParseES6DateTime(
       DateStringTokenizer<Char>* scanner,
       DayComposer* day,
       TimeComposer* time,
       TimeZoneComposer* tz);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DATEPARSER_H_