Why does Time.now.utc? return false?

In my environment.rb file I have:

ENV['TZ'] = 'UTC'

When I go into the console I do this:

t = Time.now

=> Mon Jan 21 07:40:25 +0000 2008

t.zone

=> "UTC"

t.utc?

=> false

Any idea why utc? is returning false when clearly the zone is UTC?

Thanks for your help.

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