Redmine

I'm using the latest redmine (3.3.0) and my timezone is not picking up DST. I'm in MDT (mountain daylight savings) timezone (UTC−6:00) but I'm seeing things in MST (UTC−7:00) such as activity and issues list. In my user account, I only see the option to select "(GMT-07:00) Mountain Time (US & Canada). It doesn't set DST automatically.

Any ideas what I can do?