Or even better way using ActiveSupport:

irb(main):001:0> require 'active_support'
=> true
irb(main):002:0> t = Time.parse('Wed Dec 09 16:05:00 -0600 2009')
=> Thu Dec 10 00:05:00 +0200 2009
irb(main):003:0> t + 10.minutes
=> Thu Dec 10 00:15:00 +0200 2009
irb(main):004:0>

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