[Rails] how to compare time?

Hi to all,
I have some time defined from my database, and this is how it looks:

ruby-1.9.2-p290 :017 > djel.smjena.pocetak1.to_time
=> 2000-01-01 08:00:00 +0100

and that is ok, it assigned me 2000-1-1

also, I got something that happened in some datetime

ruby-1.9.2-p290 :019 > dog.pocetak
=> Thu, 25 Aug 2011 08:18:00 UTC +00:00

So I was hoping, that .to_time would ditch my date, but that does not
happen

ruby-1.9.2-p290 :020 > dog.pocetak.to_time
=> Thu, 25 Aug 2011 08:18:00 UTC +00:00

so, now, comparing if something happened before 8:00 is useless.
So, how can I compare that? is there a way to set dog.pocetak to
2000-01-01 without touch clock?
thank you

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