/usr/lib/ruby/vendor_ruby/active_support/core_ext/date/zones.rb is in ruby-activesupport 2:4.2.10-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | require 'date'
require 'active_support/core_ext/date_and_time/zones'
class Date
include DateAndTime::Zones
end
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