Using Time zone in API

I asked a question about using different times in the API, and got a response on how to get a timezone of a user, but no answer on how to add a timezone to the API. My previous question is here: https://community.lithium.com/t5/Developers-Discussion/Help-with-API-time/m-p/227202/highlight/true#M10332 

I need to know what parameter to pass a v1 api call to set the timezone for the call. Specifically for something like this: 

/restapi/vc/metrics/name/posts/history/daily?date_start=2016-05-05&date_end=2016-06-06&"Timezone Parameter Name goes here"=Pacific/Fiji"This is an example timezone returned from the suggested API call from my last post"