ROQL and Interface Timezone Offset

Content

Can anybody help me understand why the following query is returning results offset to interface timezone? Isn't ROQL using UTC?

Version

May 2016

Code Snippet

             USE OPERATIONAL;

SELECT Contact.CreatedTime
 FROM Contact WHERE 
Contact.CreatedTime BETWEEN '2016-12-06T06:00:00Z' AND '2016-12-06T06:05:00Z'