I removed it because it doesn't affect our test results in any way. The `@timestamp` value is a `Time` class and it need not be in UTC. Times can be equivalent regardless of timezone. Consider the following...

    $ irb
    irb(main):001:0> require 'time'
    => true
    irb(main):002:0> Time.iso8601('2013-09-02T22:35:36.587-01:00') === Time.iso8601('2013-09-02T23:35:36.587Z')
    => true
    irb(main):003:0> Time.iso8601('2013-09-02T22:35:36.587-01:00').utc === Time.iso8601('2013-09-02T23:35:36.587Z')
    => true