Thank you contacting us and bringing this to our attention! Currently Account Administrators have access to the time zones for each user as well. Perhaps until this work around is addressed alerting the Administrator might be the best course of action. I realize this isn't the best solution, but if a user is going to great lengths to get around the perimeters set in place, then it's an issue of the heart and the only solution can come from a transparent discussion and hopefully a change of heart about the importance of Accountability and Filtering. I will have someone look into this and add your suggestion as a feature request. Thank you again for bringing this to our attention!