Setting expiry more than 30 days in the future fails on Mock

But, it works great on the server.  The mock should add the doc, with the proper expiry.  There is some tricky stuff here - if the expiry you set is less than 30 days worth of seconds from now, it is just that.  If it is larger than that, it is assumed to be a date in seconds since 1/1/1970.  And it is returned the same way.