[teej]

1.day is not a native Ruby concept, it is a method monkeypatched into the Numeric class by Rails' ActiveSupport. See http://api.rubyonrails.org/classes/Numeric.html#method-i-day and https://ruby-doc.org/core-2.2.0/Numeric.html.

[twblalock]

I can see how people think it is native Ruby. Very few people use Ruby without Rails.