make Date.parse properly handle TZ offsets...

src/dateparser-inl.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 47 matching lines @@
         }
       } else if (in.Skip('.') && time.IsExpecting(n)) {
         time.Add(n);
         if (!in.IsAsciiDigit()) return false;
         int n = in.ReadUnsignedNumber();
         time.AddFinal(n);
       } else if (tz.IsExpecting(n)) {
         tz.SetAbsoluteMinute(n);
       } else if (time.IsExpecting(n)) {
         time.AddFinal(n);
-        // Require end, white space or Z immediately after finalizing time.
-        if (!in.IsEnd() && !in.SkipWhiteSpace() && !in.Is('Z')) return false;
+        // Require end, white space, "Z", "+" or "-" immediately after
+        // finalizing time.
+        if (!in.IsEnd() && !in.SkipWhiteSpace() && !in.Is('Z') &&
+            !in.IsAsciiSign()) return false;
       } else {
         if (!day.Add(n)) return false;
         in.Skip('-');  // Ignore suffix '-' for year, month, or day.
         // Skip trailing 'T' for ECMAScript 5 date string format but make
         // sure that it is followed by a digit (for the time).
         if (in.Skip('T') && !in.IsAsciiDigit()) return false;
       }
     } else if (in.IsAsciiAlphaOrAbove()) {
       // Parse a "word" (sequence of chars. >= 'A').
       uint32_t pre[KeywordTable::kPrefixLength];
@@ skipping 34 matching lines @@
       // Ignore other characters.
       in.Next();
     }
   }
   return day.Write(out) && time.Write(out) && tz.Write(out);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_DATEPARSER_INL_H_