Is there a way to set a default time zone for all users?

Question

I know where to set the default time zone in the Site settings area but I want all of our authenticated users to use the Eastern U.S. time zone as well so that the timestamps are consistent for all forum replies. Is there a way to do that for all existing and new users?

Ben Tiedt · Answer

Unknown said: so that the timestamps are consistent for all forum replies 
 Times are stored in a consistent format (usually as UTC dates) and adjusted to the accessing user's timezone so that they are accurate to each viewer. 
 Unknown said: Is there a way to do that for all existing and new users? 
 Are the existing users' timezones incorrect (not their actual timezones)? 
 If so, there is not a UI to do this, but a widget script or the REST API could be used to iterate on all users and set their timezone information.