AspNet-OpenIdConnect-Server/Owin.Security.OpenIdConnect.Server — pull request #2 by PinpointTownes (2014-06-27 17:26:03+00:00)
Title: Use OAuthAuthorizationServerOptions.SystemClock and favor AuthenticationProperties.ExpiresUtc when present

https://github.com/AspNet-OpenIdConnect-Server/Owin.Security.OpenIdConnect.Server/issues/1