I have tried this:
>> t = Time.now
=> Thu Mar 13 12:57:47 +0100 2008
>> t1 = Time.now + 1.hours
=> Thu Mar 13 13:58:03 +0100 2008
>> t2 = t1 - t
=> 3615.968256
>> tot = Time.at(t2)
=> Thu Jan 01 02:00:15 +0100 1970

but I don't know why the difference between t1 e t is 2 hours and not 1 
hour?
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