/usr/lib/ruby/vendor_ruby/ is in ruby-chronic 0.10.2-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/chronic.rb
/usr/lib/ruby/vendor_ruby/chronic/
/usr/lib/ruby/vendor_ruby/chronic/mini_date.rb
/usr/lib/ruby/vendor_ruby/chronic/season.rb
/usr/lib/ruby/vendor_ruby/chronic/handler.rb
/usr/lib/ruby/vendor_ruby/chronic/numerizer.rb
/usr/lib/ruby/vendor_ruby/chronic/repeater.rb
/usr/lib/ruby/vendor_ruby/chronic/span.rb
/usr/lib/ruby/vendor_ruby/chronic/separator.rb
/usr/lib/ruby/vendor_ruby/chronic/ordinal.rb
/usr/lib/ruby/vendor_ruby/chronic/time_zone.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_second.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_season.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_month.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_hour.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_weekday.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_day_name.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_day_portion.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_time.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_month_name.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_season_name.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_weekend.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_year.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_week.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_minute.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_day.rb
/usr/lib/ruby/vendor_ruby/chronic/repeaters/repeater_fortnight.rb
/usr/lib/ruby/vendor_ruby/chronic/time.rb
/usr/lib/ruby/vendor_ruby/chronic/sign.rb
/usr/lib/ruby/vendor_ruby/chronic/grabber.rb
/usr/lib/ruby/vendor_ruby/chronic/scalar.rb
/usr/lib/ruby/vendor_ruby/chronic/tag.rb
/usr/lib/ruby/vendor_ruby/chronic/parser.rb
/usr/lib/ruby/vendor_ruby/chronic/handlers.rb
/usr/lib/ruby/vendor_ruby/chronic/pointer.rb
/usr/lib/ruby/vendor_ruby/chronic/token.rb
/usr/lib/ruby/vendor_ruby/chronic/date.rb