In order to globally disable the use of TimeZone conversions for your (legacy?) application – here’s the proper configurations:
In config/application.rb (or config/environment.rb depending on Rails version):
123 config.time_zone = 'Mountain Time (US & Canada)' #uncommented and set to proper zone config.active_record.default_timezone = :local config.active_record.time_zone_aware_attributes = false