What's the time zone of the API response?

I called https://community.dynamics.com/api.ashx/v2/forums/33/threads/311979.json to get information of the thread link table for bridge transaction after posted to GL. In the response, there is a "Date" field indicates the created date of the thread, but there is no time zone info in that field, so does any one know how to determine the time zone info in the API response?