Merge pull request dotnet/corefx#9522 from mconnew/JsonSerializerDateTimePerfFix
authorMatt Connew <mconnew@microsoft.com>
Thu, 23 Jun 2016 20:42:51 +0000 (13:42 -0700)
committerGitHub <noreply@github.com>
Thu, 23 Jun 2016 20:42:51 +0000 (13:42 -0700)
Improve performance of DCJS serializing DateTime objects
Fixes dotnet/corefx#9342

Commit migrated from https://github.com/dotnet/corefx/commit/0b0495ef783cd6798cc3ffb1f8a942c7c8c8638a


Trivial merge