compare_with_coercion

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 104
        def compare_with_coercion(other)
          other = other.comparable_time if other.respond_to?(:comparable_time)
          other = other.to_datetime unless other.acts_like?(:date)
          compare_without_coercion(other)
        end