change AR default_timezone to :utc since it's the default for AR::Railtie #4573
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This is an already known inconsistency reported here https://rails.lighthouseapp.com/projects/8994/tickets/5679-activerecordbasedefault_timezone
Since AR 3.0,
AR::Base.default_timezone
is set to:utc
in Railtie https://github.com/rails/rails/blob/c05f3b0e4f/activerecord/lib/active_record/railtie.rb#L48then overridden to
:local
at Base or Corehttps://github.com/rails/rails/blob/c05f3b0e4f/activerecord/lib/active_record/core.rb#L51
Because of this,
AR::Base.default_timezone
value defers for a Rails appand a Ruby script that doesn't load
AR::Railtie
The next major version up must be the best timing for fixing this inconsistency, so I propose this patch again for 4.0.