I have a Time object T. What's a reasonable way to add N days to T?

The best I've come up with feels somewhat tortured:

require 'date'
def add_days(time, days)
  time.to_date.next_day(days).to_time
end

P.S.: If you are in the US, a correct answer must satisfy:

add_days(Time.new(2013, 3, 10, 0), 1) == Time.new(2013, 3, 11, 0)

and if you are in the EU, a correct answer must satisfy:

add_days(Time.new(2013, 3, 31, 0), 1) == Time.new(2013, 4, 1, 0)

P.P.S: This is a Ruby question, not a Rails question.

ruby time
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