Ruby on Rails time zone strange behaviour

Ruby on Rails time zone strange behaviour

There is task model with attributes when and duration.
create_table "tasks", force: true do |t|
...
t.datetime "when"
t.integer "duration"
...
end
I wrote method for checking if task is active so I can show it on page.
This is active method:
def active?
if (self.when + self.duration) > Time.now
true
end
end
I tried in console to inspect object:
t.when + t.duration
=> Sun, 08 Sep 2013 01:01:00 UTC +00:00
DateTime.now
=> Sun, 08 Sep 2013 01:57:13 +0200
t.active?
=> true
It's true but I entered 1:01 time and 1 minute for duration and I hoped it
shouldn't be true.
It seems that when column in database is not saved in correct time zone,
so it gives incorrect results. How to solve this issue?