-(other) public

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# File activesupport/lib/active_support/time_with_zone.rb, line 228
    def -(other)
      # If we're subtracting a Duration of variable length (i.e., years, months, days), move backwards from #time,
      # otherwise move backwards #utc, for accuracy when moving across DST boundaries
      if other.acts_like?(:time)
        utc.to_f - other.to_f
      elsif duration_of_variable_length?(other)
        method_missing(:-, other)
      else
        result = utc.acts_like?(:date) ? utc.ago(other) : utc - other rescue utc.ago(other)
        result.in_time_zone(time_zone)
      end
    end
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