Trouble toQueryString() and Dates

[kstubs]

I'm not sure where I am going wrong, probably in the parsing of the original date value (dates are confusing to me).  I have an object that looks like this:

dto = { LookupIndex: 1, mediaCreatedAt: Tue Sep 11 2012 02:06:31 GMT-0700 (US Mountain Standard Time), query_name: "fetch", stamp=1347329813597 }

In console, if I have over mediaCreatedAt, I see an error for _proto__, and it is Invalid date.

When I call toQueryString() on my object like this:

$H(dto).toQueryString() the result is:  stamp%3D=1347329813597&LookupIndex=1&query_name=fetch

Ideas?

Thanks,

Karl..

[Victor]

Make please example at jsfiddle.net